DNVGL-SE-0475 Verification and certification of submarine ... · DNV GL certification of submarine...

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SERVICE SPECIFICATION

DNVGL-SE-0475 Edition July 2017

Verification and certification of submarinepipelines

FOREWORD

DNV GL service specifications contain procedural requirements for obtaining and retainingcertificates and other conformity statements to the objects, personnel, organisations and/oroperations in question.

© DNV GL AS July 2017

Any comments may be sent by e-mail to [email protected]

This service document has been prepared based on available knowledge, technology and/or information at the time of issuance of thisdocument. The use of this document by others than DNV GL is at the user's sole risk. DNV GL does not accept any liability or responsibilityfor loss or damages resulting from any use of this document.

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Service specification — DNVGL-SE-0475. Edition July 2017 Verification and certification of submarine pipelines

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CHANGES – CURRENT

GeneralThis document supersedes the January 2014 edition of DNV-OSS-301.The purpose of the revision of this service document is to comply with the new DNV GL document reference code system and profile requirements following the merger between DNV and GL in 2013. Changes mainly consist of updated company name and references to other documents within the DNV GL portfolio.

Some references in this service document may refer to documents in the DNV GL portfolio not yet published (planned published within 2017). In such cases please see the relevant legacy DNV or GL document. References to external documents (non-DNV GL) have not been updated.

Editorial correctionsIn addition to the above stated changes, editorial corrections may have been made.

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CONTENTS

Changes – current.................................................................................................. 3

Section 1 Introduction............................................................................................ 61.1 General............................................................................................. 61.2 Definitions.........................................................................................81.3 References...................................................................................... 11

Section 2 Principles of risk-differentiated verification.......................................... 122.1 General........................................................................................... 122.2 Verification principles..................................................................... 122.3 Selection of level of verification involvement................................. 142.4 Defining a verification plan/scope of work.....................................172.5 Information flow.............................................................................17

Section 3 Verification activities.............................................................................203.1 General........................................................................................... 203.2 Project phases................................................................................ 203.3 Project initiation............................................................................. 213.4 Project realisation.......................................................................... 213.5 Operation........................................................................................ 27

Section 4 Verification service requirements..........................................................304.1 General........................................................................................... 304.2 Verification service documents....................................................... 30

Section 5 Certification service requirements.........................................................335.1 General........................................................................................... 335.2 Certification service documents......................................................345.3 Retention of pipeline certificate......................................................36

Appendix A ...........................................................................................................39A.1 General........................................................................................... 39A.2 Trigger questions............................................................................39

Appendix B Generic description of project sub-phases......................................... 42B.1 General........................................................................................... 42B.2 Initial studies................................................................................. 42B.3 Design.............................................................................................43B.4 Other phases.................................................................................. 43

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Appendix C Examples of verification and certification documents.........................44C.1 General........................................................................................... 44

Appendix D Detailed scope of work tables for verification and certification.......... 47D.1 General........................................................................................... 47D.2 Description of terms used in the scope of work tables................... 47D.3 Overall project management.......................................................... 49D.4 Design............................................................................................ 49D.5 Construction................................................................................... 57D.6 Operation........................................................................................80

Changes – historic................................................................................................87


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SECTION 1 INTRODUCTION

1.1 General

1.1.1 Introduction

1.1.1.1 This DNV GL service specification describes the DNV GL verification service for submarine pipelinesand defines the additional requirements for obtaining and retaining a DNV GL pipeline system certificate ofconformity.

1.1.1.2 This service specificationfalls under the top level document DNVGL-SE-0474 Risk based verificationand applies risk-differentiated levels of verification involvement.

1.1.1.3 This service specification identifies and describes verification activities for a pipeline system duringdesign, construction and operation.

1.1.1.4 This service specification is tailor-made for verification and certification of pipeline systems designedand constructed in accordance with DNVGL-ST-F101.

1.1.1.5 The identified and described verification activities in this service specification are generic. Based onthe scope of work tables in Sec.3, the detailed verification scope of work tables in App.D should be subject toproject specific tailoring based on risk assessments.

1.1.2 Objectives

1.1.2.1 The objectives of this document are to:

— describe DNV GL’s verification and certification services for submarine pipeline systems— describe DNV GL’s approach to risk differentiated levels of verification involvement— provide guidance for the selection of the level of DNV GL verification involvement— provide guidance on how to establish a verification plan— provide a common communication platform for describing the extent of verification activities required for

DNV GL certification of submarine pipelines.

1.1.3 Verification service

1.1.3.1 The objective for the verification service is generally the verification of the pipeline integrity. Otheraspects, such as the verification of the environmental impact of the pipeline system, or its suitability withrespect to flow capacity and flow assurance, may be included in DNV GL’s scope of work, if desired by thecustomer.

1.1.3.2 The verification service is described in Sec.4. Scope of work definition based on risk-differentiatedlevel of verification involvement is described in Sec.2. Sec.3 describes different project phases and givesgeneric scope of work tables.

1.1.3.3 For verification services the customer may stipulate the verification scope of work and the level ofverification involvement to be applied. The selection of the level of verification involvement should be basedon a risk assessment. The verification scope of work may impact the type of DNV GL deliverables.

1.1.3.4 For verification services this service specification may be adopted for the verification of parts of apipeline system and/or selected project phases.


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1.1.3.5 For verification to other technical standards than DNVGL-ST-F101 or to customer’s specifications,this service specification may still be used as a communication platform and as a starting point forpreparation of project specific scope of work tables.

1.1.4 Certification service

1.1.4.1 The objective for the certification service is the verification of the pipeline integrity.

1.1.4.2 For certification services this service specification identifies and describes the verification activitiesrequired to obtain a DNV GL pipeline system certificate of conformity and how to retain the certificate duringoperation if the scope of work covers a certificate with maintenance conditions.

1.1.4.3 For certification services the verification scope of work is defined in Sec.5. DNV GL shallindependently of the customer stipulate the level of verification involvement to be applied.

1.1.4.4 The certification service is based on the principles described in Sec.2. The project specific verificationplan requested in [2.4] shall be developed based on the generic scope of work in Sec.3 and in accordancewith the requirements in Sec.5.

1.1.4.5 Statutory certification of pipeline systems to the requirements of national authorities is not includedspecifically in the scope of application of this service specification. Such certification shall be governed by theregulations of the national authorities. However, if detailed procedures are not given by these authorities, thisservice specification shall be used by DNV GL as a guideline for DNV GL’s work.

Guidance note:The certificate issued shall state that it is issued under authorisation of the relevant authorities, including reference to the relevantcertification scheme.

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1.1.5 Structure of this document

1.1.5.1 This document consist of five sections and four appendices:

Thissection

gives the general scope of the document, definitions and references.

Sec.2 describes the principles of verification based on risk differentiated levels of verificationinvolvement, how to define the level of verification involvement, and how to develop averification plan/scope of work for a particular project.

Sec.3 describes generic verification activities for each of the project phases.

Sec.4 describes the verification service; scope of work definition and documents issued by DNV GLas a result of the verification service process.

Sec.5 describes the certification service; requirements for obtaining and retaining a DNV GLpipeline system certificate of conformity, and documents issued by DNV GL as a result of thecertification service process.

App.A poses trigger questions for the selection of level of verification involvement.

App.B contains generic descriptions of project sub-phases.

App.C gives examples of DNV GL verification and certification service documents.

App.D gives detailed scope of work tables for all project phases and all levels of verificationinvolvement. These tables are generic and the basis for the development of project specificscope of work tables.


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1.2 Definitions

1.2.1 General

1.2.1.1 The definitions in DNVGL-ST-F101 Sec.1 also apply to this service specification.

1.2.1.2 The most important definitions from DNVGL-ST-F101 applied in this service specification arerepeated. They are marked (DNVGL-ST-F101) between the word and its definition, ref. e.g. verification.

1.2.2 Verbal formsTable 1-1 Verbal forms

Term Definition

shall verbal form used to indicate requirements strictly to be followed in order to conform to thedocument

should verbal form used to indicate that among several possibilities one is recommended asparticularly suitable, without mentioning or excluding others, or that a certain course ofaction is preferred but not necessarily required

may verbal form used to indicate a course of action permissible within the limits of the document

1.2.3 TermsTable 1-2 Terms

Terms Definition

certification third-party issue of a statement, based on a decision following review, that fulfilment ofspecified requirements has been demonstrated related to products, processes or systems.Review shall in this context mean verification of the suitability, adequacy and effectivenessof selection and determination activities, and the results of these activities, with regardto fulfilment of specified requirements by an object of conformity assessment (see ISO17000:2004).

certification service the process of performing certification, the certification service includes the issuing of a DNVGL certificate, the certification service requires a service specification as reference

Guidance note:A certification service may be regarded as a verification process which fulfils certain formalrequirements. The scope of work is normally standardized and shall be pre-defined in the formof a publicly available service description, either a DNV GL service specification or a nationallyor internationally recognized standard which stipulates certification requirements. The finaldeliverable DNV GL document shall be a certificate. The type of certificate that may be issueddepends on the nature of the certification scope of work.


commissioning activities associated with the initial filling of the pipeline system with the fluid to betransported, part of operational phase (see DNVGL-ST-F101)


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Terms Definition

pre-commissioning activities after tie-in/connection and prior to commissioning including system pressure-testing, dewatering, cleaning and drying (see DNVGL-ST-F101)

construction phase the construction phase will typically include manufacture, fabrication and installationactivities. Manufacture activities will typically include manufacture of linepipe and corrosionprotection and weight coating. Fabrication activities will typically include fabrication ofpipeline components and assemblies. Installation activities will typically include pre- andpost-intervention work, transportation, installation, tie-in and pre-commissioning (seeDNVGL-ST-F101).

customer DNV GL’s contractual partner, it may be the purchaser, the operator, the owner or acontractor

design all related engineering to design the pipeline including both structural as well as materialand corrosion (see DNVGL-ST-F101)

fabrication activities related to the assembly of objects with a defined purpose in a pipeline system (seeDNVGL-ST-F101)

hazard a deviation (departure from the design and operating intention) which could cause damage,injury or other form of loss (see the Chemical Industries Association HAZOP Guide)

hazard and operabilitystudy (HAZOP)

the application of a formal systematic critical examination to the process and engineeringintentions of new or existing facilities to assess the hazard potential of mal-operation ormal-function of individual items of equipment and their consequential effects on the facilityas a whole (see the Chemical Industries Association HAZOP Guide)

installation (activity) the operations related to installing the equipment, pipeline or structure, e.g. pipeline laying,tie-in, piling of structure etc. (see DNVGL-ST-F101)

manufacture making of articles or materials, often in large volumes, in relation to pipelines, refers toactivities for the production of linepipe, anodes and other components and application ofcoating, performed under contracts from one or more contractors (see DNVGL-ST-F101)

operations (phase) the phase when the pipeline is being used for the purpose for which it was designed

pipeline integrity pipeline integrity is the ability of the submarine pipeline system to operate safely andwithstand the loads imposed during the lifetime cycle (see DNVGL-ST-F101)

risk the qualitative or quantitative likelihood of an accident or unplanned event occurring,considered in conjunction with the potential consequences of such a failure. In quantitativeterms, risk is the quantified probability of a defined failure mode times its quantifiedconsequence (see DNVGL-ST-F101)


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Terms Definition

risk reduction measures those measures taken to reduce the risks to the operation of the pipeline system and to thehealth and safety of personnel associated with it or in its vicinity by:

— reduction in the probability of failure— mitigation of the consequences of failure.

Guidance note:The usual order of preference of risk reduction measures is:

1) inherent safety

2) prevention

3) detection

4) control

5) mitigation

6) emergency response.


safety objectives the safety goals for the construction, operation and decommissioning of the pipelineincluding acceptance criteria for the level of risk acceptable to the owner (see DNVGL-ST-F101 Sec.2)

verification confirmation, through the provision of objective evidence, that specified requirements havebeen fulfilled (see ISO 9000:2005)

Guidance note:The term verified is used to designate the corresponding status. Verification can compriseactivities such as:

— performing alternative or additional calculations

— comparing a new design specification with a similar proven design specification

— undertaking validation tests

— reviewing documents.


verification service the verification service includes, in addition to performing verification, the issuing of adeliverable DNV GL document in which the conclusion of the verification activity is stated

Guidance note:The scope of work shall be agreed, and described in a contract, between DNV GL and thecustomer. The scope of work may be described by reference to an object specific DNV GLservice specification or technical standards specified by customer. In the case of an objectspecific DNV GL service specification forming the basis for verification scope definition, anydeviation or amendment to the scope of work outlined in the DNV GL service specification shallbe addressed in the contract. The deliverables shall be agreed in the contract. The type of DNVGL document(s) that may be issued depends on the extent and nature of the verification scopeof work.



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1.3 ReferencesTable 1-3 References

Document code Title

DNVGL-ST-F101 Submarine pipeline systems, latest revision

DNVGL-SE-0474 Risk based verification, latest revision

DNVGL-RP-F105 Free spanning pipelines, latest revision

DNVGL-RP-F109 On-bottom stability design of submarine pipelines, latest revision

DNVGL-RP-F110 Global buckling of submarine pipelines, structural design due to high temperature/highpressure, latest revision

DNVGL-RP-F111 Interference between trawl gear and pipelines, latest revision

DNVGL-RP-F116 Integrity management of submarine pipeline systems, latest revision

Chemical IndustriesAssociation Limited,London

A Guide to Hazard and Operability Studies, 1979

ISO 9000:2005 Quality management systems – Fundamentals and vocabulary, International Organization forStandardization, Geneva

ISO 9001:2008 Quality management systems – Requirements, International Organization for Standardization,Geneva

ISO 17000:2004 Conformity Assessment—Vocabulary and general principles, International Organization forStandardization, Geneva

For the DNV GL documents the latest revision publicly available applies.


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SECTION 2 PRINCIPLES OF RISK-DIFFERENTIATED VERIFICATION

2.1 General

2.1.1 Objectives

2.1.1.1 The objectives of this section are to provide:

— introduction to the principles of verification of submarine pipeline systems— introduction to the principles of risk differentiated levels of verification involvement— guidance on the selection of levels of verification involvement— information on how to develop a verification plan— information on involved parties, communication and obligations.

2.2 Verification principles

2.2.1 Purpose of verification

2.2.1.1 Verification constitutes a systematic and independent examination of the various phases in thelifecycle of a pipeline system to determine whether it fulfils the specified requirements.

2.2.1.2 Verification activities are expected to identify errors or failures in the work associated with thepipeline system and to contribute to reducing the risks to the operation of the pipeline system and to thehealth and safety of personnel associated with it or in its vicinity.

2.2.1.3 Verification is primarily focused on pipeline integrity, but business risk (e.g. cost and schedule) mayalso be addressed.

2.2.2 Verification as a complementary activity

2.2.2.1 Verification shall be complementary to routine design, construction and operations activities and nota substitute. Therefore, although verification will take into account the work, and the quality assurance andquality control of that work, carried out by the owner and his contractors, it is inevitable that verification willduplicate some work that has been carried out previously by other parties involved in the pipeline project.

2.2.3 Verification management

2.2.3.1 The verification philosophy and verification methods used shall be described to ensure satisfactorycompletion of the verification activities.

2.2.3.2 The philosophy and the methods shall ensure that the verification:

— has a consistent and constructive approach to the satisfactory completion and operation of the pipelinesystem

— is available world-wide wherever the owner or his contractors operate— applies up-to-date methods, tools and procedures— employs qualified and experienced personnel.


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2.2.3.3 All verification activities shall be carried out by competent personnel. Competence includes havingthe necessary theoretical and practical knowledge and experience of the activity being examined. Anadequate verification of some activities may require access to specialised technical knowledge.

2.2.3.4 As well as demonstrating competence of individuals, the verification organisation shall be able toshow competence and experience in pipeline verification work.

2.2.4 Risk-differentiated levels of verification involvement

2.2.4.1 The approach of risk-differentiated levels of verification involvement shall be applied to the definitionof verification plan/scope of work, as outlined in the general risk based verification service overview inDNVGL-SE-0474.

2.2.4.2 The level of verification involvement is differentiated according to the risk associated with thepipeline. If the risk associated with the pipeline is higher, the level of verification involvement is higher.Conversely, if the risk associated with the pipeline is lower, the level of verification involvement can bereduced, without reducing the verification effectiveness.

2.2.4.3 The verification involvement is categorised into low, medium and high. A summary of the levelsof involvement is given in Table 2-1. This table covers verification during the project phase, for verificationduring operation of a pipeline the verification involvement should be categorised into levels based on thesame principles.

Medium is the customary level of verification involvement and is applied to the majority of pipelines.

High is the level of verification involvement applied where the risks associated with the pipeline arehigher because, for example, it has highly corrosive contents, it is in adverse environmentalconditions, it is technically innovative or the contractors are not well experienced in the designand construction of similar pipelines.

Low is the level of verification involvement applied where the risks associated with the pipeline arelower because, for example, it has benign contents, it is located in congenial environmentalconditions, or the contractors are well experienced in the design and construction of similarpipelines.

Table 2-1 Summary of verification involvement and guidance for their applicability – projectphase

Level Description of verification involvement Guidance for typical application for each level ofinvolvement

Low — Review of general principles and productionsystems during design and construction.

— Review of principal design documents,construction procedures and qualification (e.g.MPQT) reports.

— Visit-based attendance during system testingand start-up activities.

— Less comprehensive involvement than levelmedium.

— Proven pipeline designs with benign contentsand/or installed in benign environmentalconditions.

— Straightforward pipelines designed andconstructed by experienced contractors.

— Low consequences of failure from a safety,environmental or commercial point of view.

— Relaxed to normal completion schedule.


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Level Description of verification involvement Guidance for typical application for each level ofinvolvement

Medium — Review of general principles and productionsystems during design and construction.

— Detailed review of principal and other selecteddesign documents with support of simplifiedindependent analyses.

— Full time attendance during (procedure)qualification (e.g. MPQT) and review of theresulting reports.

— Visit-based or intermittent presence at site.

— Pipelines in moderate environmental conditions.— Projects with a moderate degree of novelty.— Medium consequences of failure from a safety,

environmental or commercial point of view.— Ordinary completion schedule.

High — Review of general principles and productionsystems during design and construction.

— Detailed review of most design documents withsupport of simplified and advanced independentanalyses.

— Full time attendance during (procedure)qualification (e.g. MPQT) and review of theresulting reports.

— Full time presence at site for most activities.— More comprehensive involvement than level

medium.

— Projects with a high degree of novelty or largeleaps in technology.

— Pipelines in extreme environmental conditions.— Inexperienced contractors or exceptionally tight

completion schedule.— Very high consequences of failure from a safety,

environmental or commercial point of view.

2.2.4.4 The selection of level of verification involvement shall be based on a risk based verification planningprocess.

2.2.4.5 The basis for the selection of level of verification involvement shall be documented.

2.2.4.6 Different levels of verification involvement can be chosen for different phases of the pipeline system,or even parts of the pipeline system within the same phase.

Guidance note:For example, pipeline design may be innovative and considered high risk whereas the installation method is well known andconsidered low risk. The converse might also be the case.Additionally, linepipe production from a well-known mill may be considered low risk, whereas, production from an unknown millmay be considered high risk.


2.2.4.7 The level of verification involvement can be reduced or increased during a phase if the originallychosen level is considered too rigorous or too lenient, as new information on the risks associated with thepipeline system becomes available.

2.3 Selection of level of verification involvement

2.3.1 Selection factors

2.3.1.1 The selection of the level of verification involvement shall depend on the criticality of each of theelements that have an impact on the management of hazards and associated risk levels of the pipelinesystem. This is illustrated by Figure 2-1.The contribution of each element shall be judged qualitatively and/or quantitatively and shall use, wherepossible, quantified risk assessment data to provide a justifiable basis for any decisions made.


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App.A gives a guideline on selection of level of verification involvement based on a simplified riskassessment.

2.3.1.2 Selection factors are the:

— overall safety objectives for the pipeline system— assessment of the risks associated with the pipeline and the measures taken to reduce these risks— degree of technical innovation in the pipeline system— experience of the contractors in carrying out similar work— quality management systems of the owner and his contractors.

Guidance note:These factors are addressed in DNVGL-ST-F101 Sec.2.


Figure 2-1 Selection of the level of verification involvement based on risk assessment

2.3.2 Overall safety objective

2.3.2.1 An overall safety objective covering all phases of the pipeline system from design to operation shouldbe defined by the customer. The safety objective should address the main safety goals as well as establishingacceptance criteria for the level of risk acceptable to the owner. Depending on the pipeline and its locationthe risk could be measured in terms of human injuries as well as environmental, political and economicconsequences.

2.3.3 Risk assessment

2.3.3.1 A systematic review, i.e. a detailed analytical risk assessment, a simplified risk assessment basedon trigger questions (see App.A), or a combination thereof; shall be carried out to identify and evaluatethe probabilities and consequences of failures in the pipeline system. The extent of the review shall reflectthe criticality of the pipeline system, the planned operation and previous experience with similar pipelinesystems. This review shall identify the risks associated with the operation of the pipeline system and to thehealth and safety of personnel associated with it or in its vicinity.

2.3.3.2 Once the risks have been identified their extent can be reduced to a level as low as reasonablypracticable by means of one or both of:

— reduction in the probability of failure— mitigation of the consequences of failure.


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Guidance note:The term as low as reasonably practicable (ALARP) has come into use through the United Kingdom’s The Health and Safety at Worketc. Act 1974. Reasonable practicability is not defined in the act but has acquired meaning by interpretations in the courts.It has been interpreted to mean that the degree of risk from any particular activity can be balanced against the cost, time andtrouble of the measures to be taken to reduce the risk.It follows, therefore, that the greater the risk the more reasonable it would be to incur substantial cost, time and effort in reducingthat risk. Similarly, if the risk was very small it would not be reasonable to expect great expense or effort to be incurred inreducing it.


2.3.3.3 The result of the systematic review of these risks is measured against the safety objectives and usedin the selection of the appropriate verification involvement level.

2.3.4 Technical innovation and contractor experience

2.3.4.1 The degree of technical innovation in the pipeline system shall be considered. Risks to the pipelineare likely to be greater for a pipeline with a high degree of technical innovation than with a pipeline designed,manufactured and installed to well-known criteria in well-known waters.

2.3.4.2 Similarly, the degree of risk associated with the pipeline system should be considered wherecontractors are inexperienced or the work schedule is tight.

2.3.4.3 Factors to be considered in the selection of the appropriate verification involvement level include:

— degree of difficulty in achieving technical requirements— knowledge of similar pipelines— knowledge of contractors’ general pipeline experience— knowledge of contractors’ experience in similar work.

2.3.5 Quality management systems

2.3.5.1 Adequate quality management systems shall be implemented to ensure that gross errors in the workfor pipeline system design, construction and operations are limited. The adequacy of the quality managementsystem should influence the selection of the level of verification involvement.

2.3.5.2 Factors to be considered when evaluating the adequacy of the quality management system include:

— whether or not an ISO 9001 or equivalent certified system is in place— results from external audits— results from internal audits— experience with contractors’ previous work— project work-force familiarity with the quality management system, e.g. has there been a rapid expansion

of the work force or are all parties of a joint venture familiar with the same system.Guidance note:Most organisations have quality management systems certified by an accredited certification body. However, when businessincreases, they expand their staff quickly by taking on contract personnel often for a fixed period or for the duration of a particularcontract.This influx of new personnel can lead to problems of control of both the whole organisation and of particular projects beingundertaken. Quality problems may then occur, as these new personnel have no detailed knowledge of the organisation’s businessmethods, its ethos or its working procedures. New organisations may experience quality problems for similar reasons.



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2.4 Defining a verification plan/scope of work

2.4.1 Risk based verification planning

2.4.1.1 Based on the pipeline system specifications, the risk assessment and the selection of level ofverification involvement, a verification plan shall be developed.

2.4.1.2 The verification plan is the scope of work for DNV GL’s verification. It should be re-visited, re-evaluated and revised if required as the project progresses and new information becomes available.

2.4.1.3 Generic scopes of work for verification at the three levels of verification involvement, low (L),medium (M) and high (H), are given in the tables in Sec.3.

2.4.1.4 Typical detailed scope of work descriptions, which are based on the generic scopes of work and whichshow the activities to be verified, are given in App.D.

2.4.1.5 A specific scope of work description shall be made for each particular project, and shall be includedin the final DNV GL verification report.

2.5 Information flow

2.5.1 Communication lines

2.5.1.1 Communication lines are illustrated in Figure 2-2. Which lines that are open for communicationdepends on the particular contractual agreements.

2.5.1.2 Where DNV GL’s customer is the designer/constructor and not of the owner (operator) of the pipelinesystem, DNV GL strongly recommends that the owner secures a direct communication line from DNV GL toowner and vice versa.

Guidance note:The recommendation stems from DNV GL’s experience with projects where communications difficulties between the parties havejeopardised the issue of the pipeline verification statement.



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Figure 2-2 Communication lines

2.5.2 Obligations

2.5.2.1 In order to achieve the purpose and benefits of verification the involved parties shall be mutuallyobliged to share and act upon all relevant information pertaining to the verification involvement.

2.5.2.2 The customer shall be obliged to:

— Give DNV GL full access in due time to all information concerning the verification scope for the pipelinesystem and ensure that clauses to this effect are included in contracts for parties acting on behalf of theowner and parties providing products, processes and services covered by the verification scope.

— Ensure that DNV GL is involved in the handling of deviations from specified requirements within theverification scope.

— Act upon information provided by DNV GL with respect to events or circumstances that may jeopardisethe pipeline system and/or the purpose and benefit of verification.

— Ensure that the safety and integrity objectives established for the pipeline project are known and pursuedby parties acting on behalf of the customer and parties providing products, processes and servicescovered by the verification scope.

2.5.2.3 The customer shall further be obliged to ensure that the designer and/or contractor:

— Perform their assigned tasks in accordance with the safety and integrity objectives established for thepipeline project.


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— Provide the owner and DNV GL in due time with all relevant information pertaining to the verificationscope.

2.5.2.4 DNV GL shall be obliged to:

— Inform the customer of events or circumstances that, in the opinion of DNV GL, may jeopardise thepipeline system integrity and/or the purpose and benefit of verification.

— Effectively perform all verification work and adjust, through a formalised change to the contract, the levelof verification involvement according to the actual performance of parties providing products, processesand services.

2.5.3 Notification of level of verification involvement

2.5.3.1 An assessment of the required level of verification involvement for a project may be made by theowner before preparing tender documents for design and construction activities. The owner can then specifythis level in invitation to tender (ITT) if a verification service is part of the scope of work. This will givecontractors guidance and reference when estimating the extent and cost of efforts associated with verificationactivities.

Guidance note:For determination of the verification scope of work for certification based on this service specification, DNV GL shall independentlyof the customer stipulate the level of verification involvement to be applied.


2.5.3.2 The required level of verification involvement may be assessed by the owner using this servicespecification. If the owner requires the contractor to carry out this assessment as part of his response to anITT the owner should provide the necessary information to enable the contractor to carry out this work. Thisinformation should include overall safety objectives for the pipeline system as well as particulars, such astemperatures, pressures, contents and environmental criteria, commonly contained in a design brief.

Guidance note:Frequently, ITTs contain the statement …. the contractor shall arrange 3rd party verification. The use of the information containedin this service specification should assist the owner to specify the required level of verification involvement more precisely.On other occasions where the verification is arranged by the owner, it is be important that contractors are informed of the level ofverification involvement planned.



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SECTION 3 VERIFICATION ACTIVITIES

3.1 General

3.1.1 Objectives


— an overview of verification activities relating to offshore pipeline systems— generic scope of work tables for verification at the three levels of verification involvement, low (L),

medium (M) and high (H).

3.1.2 Scope of work

3.1.2.1 The process of defining a verification plan with a scope of work is described in [2.4]. Responsibilitiesand requirements to the definition of the verification plan are addressed in [1.1.3] and [1.1.4] for verificationservice and certification service, respectively.

3.1.2.2 The verification activities described in the scope of work tables are generic. Their relative risk rating,represented by the type of involvement at the different verification involvement levels, is experienced basedand does not take into account the specifics or differences between flow-line and export lines, sweet and sourgas, etc.

3.2 Project phases

3.2.1 General principles

3.2.1.1 DNV GL’s verification scope for pipeline systems is based on distinct project phases and therecognition of key milestones.

3.2.1.2 The verification process may follow the project phases:

3.2.1.3 Project initiation

— conceptual design— basic design/front end engineering design (FEED).

3.2.1.4 Project realisation

— detail design— construction/fabrication— construction/installation— pre-commissioning— project completion.

3.2.1.5 Project operation

— commissioning, operations, maintenance and repair.


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Guidance note:The above phases generally follow the main sections of DNVGL-ST-F101. Where projects or other standards use other terms, thesecan be used provided they are well defined and agreed.App.C includes some generic descriptions of typical sub-phases. This may be used as guidance when agreeing the content orcompleteness of a sub-phase.


3.3 Project initiation

3.3.1 Verification during conceptual design

3.3.1.1 Verification during early stages of a project can reduce the need for verification during the designand construction phases. The scope of work shall be agreed in each case.

3.3.1.2 It is advisable to combine the design verification during conceptual design with additional review of:

— environmental aspects— project schedule— project cost.

3.4 Project realisation

3.4.1 General

3.4.1.1 All design and construction aspects relevant to pipeline integrity may be covered by the verificationservice. During design the specifications (requirements) are developed, while the construction proceduresdescribe how the requirements shall be satisfied and implemented during construction.

3.4.2 Verification of overall project management

3.4.2.1 Verification of the overall project management is the examination of the means of controlling thepipeline project.

3.4.2.2 This verification is to confirm that the necessary controls are in place to ensure information flowsacross the various interfaces. This is especially important where separate contractors have been employed fordifferent phases of the project such as design and installation.

3.4.2.3 Typically, it is expected that the quality management documentation is in line with ISO 9001requirements.

3.4.2.4 Definition of scope of work for verification of overall project management at the different levels ofverification involvement should follow Table 3-1.


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Table 3-1 Scope of work for verification of overall project management

Level of involvementVerification activity

L M H

Review of the project management process by:

— review of project quality management documentation x x x

— audit of project quality management system x x

— review of sub-contractor control x x

— review of interface controls x x

— review of methods of information flow x x

3.4.3 Verification during design

3.4.3.1 Design verification is the examination of the assumptions, methods and results of the design processand is performed at the specified level of verification involvement to confirm that the requirements to thespecific pipeline system will be fulfilled.

3.4.3.2 Design verification shall consist of one, or more, of:

— reviewing the design process— reviewing specifications for design— reviewing design reports and drawings— performing independent parallel calculations— reviewing specifications for construction and operation, resulting from design.

3.4.3.3 The documents that should be produced in the design phase are given in DNVGL-ST-F101 Sec.12.

3.4.3.4 Definition of scope of work for verification of design at the different levels of verification involvementshould follow Table 3-2.

Table 3-2 Scope of work for verification of design


L M H

Review of the design process by:

— review of design quality management documentation x x x

— audit/attend owner’s audit of design quality management system x

Review of specifications for design by:

— review of the design basis with emphasis of the survey results andenvironmental data. Evaluation of the design criteria

x x x

— review of pipeline routing1) x x


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L M H

Review of design reports and drawings by2):

— review of the main pipeline documentation to confirm that the main loadconditions have been accounted for in design, that the governing conditionsare identified, and that the chosen design philosophies including pipeline safetysystem are in accordance with specified codes and standards

x x x

— evaluation of the main methods used and spot checks of the input data and thecalculation results

x x

— detail review of main design reports x

Performing independent parallel calculations by:

— check of wall thickness x x x

— simplified independent analyses/calculation(s) performed by spot checks x x

— advanced independent analyses/calculation(s) performed by spot checks x

Review of specifications for construction and operation by:

— spot check of critical aspects x x x

— review of main specifications x x

— detailed review of main specifications x

Review of flow assurance (non-integrity aspects3)) by:

— general principles x x x

— review of main documents supported by simplified analyses x x

Notes:

1) Verification activity to be agreed case by case considering aspects as

— general knowledge of the area— criticality of the results.

2) If the pipeline system is designed for different pressures along the pipeline (segmented design) this shouldbe reflected in the verification scope of work regarding flow assurance, in addition to wall thickness, safetysystems, etc.

3) These are optional certification services.

Guidance note:Design verification activities may be split between basic design (sometimes called FEED, and which may performed as a part of theproject initiation phase) and detailed design, or other sub-phase, depending on type of contract.



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3.4.4 Verification during construction

3.4.4.1 Verification during construction shall be carried out by means of full time attendance, audits,inspections or spot checks of the work, as appropriate, in sufficient detail to confirm that the specifiedrequirements of the pipeline system will be fulfilled.

3.4.4.2 Verification of these activities relates not only to the contractor’s work, but also to the monitoring ofthis work carried out by others.

3.4.4.3 During construction verification shall consist of one, or more, of:

— reviewing the construction engineering— reviewing construction procedures— reviewing qualification process— surveillance during construction activities— reviewing final documentation.

3.4.4.4 The documents that should be produced in the project are given in DNVGL-ST-F101 Sec.12.

3.4.4.5 Definition of scope of work for verification of construction at the different levels of verificationinvolvement should follow Table 3-3 and Table 3-4 for manufacturing and fabrication, Table 3-5 forinstallation, Table 3-6 for final testing and project completion, and Table 3-7 for pipeline control and safetysystems.

Table 3-3 Scope of work for verification of manufacturing and fabrication of linepipe, incl.external linepipe coating, and other pressure containing components


L M H

Review of the manufacturing and fabrication process by:

— review of manufacturing and fabrication management systems x x x

— audit or attend owner’s audit of the quality management system x

Review of manufacturing and fabrication procedures by:

— review manufacturing, fabrication and inspection procedures for confirmation ofcompliance with the manufacturing specifications

x x x

Review of qualification process by:

— review the manufacturing procedure specification, (MPS), and manufacturingprocedure qualification test (MPQT), if applicable

x x x

— full time attendance during MPQT, if applicable, or first day production x x

Surveillance during manufacturing and fabrication activities by:

— visit-based attendance during testing, to confirm, based on spot checks,that the delivered products have been produced in accordance with themanufacturing specification

x x x


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L M H

— visit-based or full-time attendance during manufacturing and fabrication toconfirm, based on spot checks, that the delivered products have been producedin accordance with the manufacturing specification

x

— full-time attendance during manufacturing and fabrication to confirm, basedon spot checks, that the delivered products have been produced in accordancewith the manufacturing specification

x

Review of final documentation x x x

Table 3-4 Scope of work for verification of manufacturing and fabrication of coatings (internalcoating and concrete coating), anodes and other non-pressure containing components


L M H

Review of the manufacturing and fabrication process by:

— review of manufacturing and fabrication management systems x x x

— audit/attend owner’s audit of the quality management system x

Review of manufacturing and fabrication procedures by:

— review manufacturing, fabrication and inspection procedures for confirmation ofcompliance with the manufacturing specification

x x


— review the manufacturing procedure specification, (MPS), manufacturingprocedure qualification test (MPQT), if applicable

x x x

— full time attendance during MPQT, if applicable, or first day production x

Surveillance during manufacturing and fabrication activities by:

— visit-based attendance during testing, manufacturing and fabrication toconfirm, based on spot checks, that the delivered products have been producedin accordance with the manufacturing specification

x x


Guidance note:Line pipe and other materials may be ordered with certificates (e.g. 3.2 according to EN 10204). This can be integrated in theoverall verification activities, so as not to duplicate work.



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Table 3-5 Scope of work for verification of installation


L M H

Review of the installation process by:

— review of installation management systems x x x

— audit/attend owner’s audit of the quality management system x x

Review of installation engineering documentation by:

— spot check of installation manual (IM)1) x x x

— review of installation analyses x x

— for critical operations (identified from the FMEA and HAZOP studies) review theIM

x x


— for critical operations, review the qualification of the IM x x x

— full time attendance during qualification tests, if applicable, or production start-up

x x

Surveillance during installation activities by:

— visit based (one shift) attendance during start up of each operation (i.e.pipelaying, riser installation, onshore sections installation, intervention works,etc.)

x x x

— full time attendance during tension trials and associated lay tests: visit based(one shift) attendance during installation

x x

— full time attendance at each operation (i.e. pipelaying, onshore sectioninstallation, riser installation, intervention works, etc.)

x


Note:

1) Installation manual (IM) is defined as a document or collection of documents required for performing the projectspecific installation work including normal operations and contingency handling/operations and acceptancecriteria.

Table 3-6 Scope of work for verification of pre-commissioning, as-built survey and projectcompletion


L M H

Review of the process by:

— review of management systems x x x



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L M H

Review of procedures by:

— review of the procedures for pre-commissioning x x x

Surveillance during testing and completion activities by:

— full time attendance during pressure testing x x x

— visit based attendance during cleaning, gauging, de-watering and drying. x x


Table 3-7 Scope of work for verification of pipeline control and safety systems


L M H

Review of the process by:

— review of management systems x x x


Review of procedures by:

— review of the procedures and test plans x x

Surveillance during testing and validation by:

— visit based attendance x

— full time attendance x x


3.5 Operation

3.5.1 Verification during operation

3.5.1.1 Verification during operation shall be carried out by audits or spot checks of the work and records insufficient detail to confirm that the specified requirements of the pipeline system continue to be fulfilled andthereby confirming that the pipeline system integrity is maintained.

3.5.1.2 Assessment of these activities shall relate to the owner’s, as well as any contractor’s, work.

3.5.1.3 These assessments shall consist of:

— review of operations processes:

— review of operations management systems— audit of the quality management system, if necessary— risk assessments— implementation of commissioning, operation and inspection philosophies.


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— review of operations manual, specifications and procedures:

— commissioning procedures— confirmation of design assumptions— method statements— inspection plans— inspection methods— procedures for evaluation of inspection results.

— attendance during operations activities:

— attendance during inspections, e.g. by modifications and repairs.

— review of monitoring and inspection records and assessments.

3.5.1.4 The documents that shall be produced in the project are given in DNVGL-ST-F101 Sec.12.

3.5.1.5 Scope of work for verification in the operations phase at the different levels of verificationinvolvement should follow Table 3-8 for commissioning, Table 3-9 for operation and Table 3-10 formodifications and repairs.

Table 3-8 Scope of work for verification of commissioning


L M H

Review of the preparation process by:

— review of main documents to check compliance with applicable designdocumentation

(x) x x

Surveillance during commissioning by:

— audit attendance (x) x


Table 3-9 Scope of work for verification of operation of the pipeline


L M H


— review of main operating documents in the integrity management system1) x x x

Review during operation by:

— start-up review of implementation of the integrity management system,operational and safety philosophy, risk assessment and integrity managementplan

x x x

— review of regular assessment reports from operational records x x

— review of preparation for periodical surveys x x

— review of reports from periodical surveys x x


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L M H

Surveillance during operation by:

— audit during start-up of periodical surveys x x

— audit in control room of procedures and quality management x x

Review of final documentation:

— Review of annual integrity assessment reports x x x

Note:

1) See DNVGL-RP-F116 Sec.2.

Table 3-10 Scope of work for verification of modification and repairs


L M H


— review of main modifications or repairs documents x x x

Surveillance during modification and repair by:

— audit during start-up for significant modifications or repairs x x x

— visit based attendance during modifications or repairs x x

— full time attendance during significant modifications or repairs x

Review of final documentation:

— Review of modification and repair reports x x x

— Review of resulting updates to the pipeline system documentation x x

3.5.1.6 Annual assessments shall be carried out to confirm that any deterioration of the pipeline system iswithin acceptable limits and that the pipeline continues to comply with the design code requirements. Theassessments shall include review of records confirming that the pipeline has been operated within its designlimits.

3.5.1.7 Additional assessments shall be carried out in case of damage, deterioration or modification to thepipeline system to confirm that it continues to comply with the design code requirements.


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SECTION 4 VERIFICATION SERVICE REQUIREMENTS

4.1 General

4.1.1 Objectives


— details of DNV GL’s verification services for submarine pipeline systems— details of DNV GL’s deliverables for verification service for submarine pipeline systems.

4.1.2 Scope of work

4.1.2.1 The verification service is described in [1.1.3].

4.1.2.2 The scope of work is determined by and shall be described in a contract between DNV GL and thecustomer.

4.1.2.3 [2.4] describes the process of defining a risk-differentiated verification plan/scope of work. Thecustomer may stipulate the level of verification involvement.

4.1.2.4 The scope of work may refer to DNVGL-ST-F101 or to other recognized technical standards orregulations.

4.1.2.5 The scope of work may be amended as agreed between DNV GL and the customer.

4.2 Verification service documents

4.2.1 General

4.2.1.1 The type of DNV GL documents that may be issued depends on the extent and nature of theverification scope of work.

4.2.1.2 DNV GL may issue verification service deliverables during the execution of the verification scope, andat its completion.The purpose of the deliverables is to document the scope of work performed, and the conclusions reached, byDNV GL. The verification documents typically follow the hierarchy shown in Figure 4-1 below.


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Figure 4-1 Typical document hierarchy for verification service

4.2.2 Statement of conformity

4.2.2.1 A statement of conformity may be issued by DNV GL as a statement confirming that verification ofdocuments and/or activities has concluded that the pipeline system complies with specified requirements. Inorder for DNV GL to issue a statement of conformity the following requirements apply:

— The scope shall cover the complete pipeline system or a major self-contained part of it. Major self-contained part shall mean a complete system, or the integration of more systems, to which risk basedverification is or may be applied.

— DNV GL shall have accepted the level of verification involvement to be satisfactory in relation to the risksassociated with the pipeline system or self-contained part of it.

— It may be issued upon completion of the total verification scope, or at completion of logical phases, e.g.design or fabrication.

— There shall not be omissions in the verification scope which may lead to misinterpretation of thestatement of conformity, e.g. in the design verification scope aspects like safety or structural integrity maynot be omitted from individual components or systems.

— There shall be no unresolved deviations, i.e. no open verification comments, which inherently infringe theintegrity of the pipeline system. In case of unresolved deviations, these shall be clearly identified in theverification report, see [4.2.3.6].

— The statement is valid on the date of issue.

4.2.2.2 Alternatives to detailed requirements/solutions specified in DNV GL standards may be accepted byDNV GL provided the pipeline integrity and reliability level is documented to be equivalent or better than thespecified requirements/solutions. This principle of equivalence does not apply to verification against non-DNVGL reference documents.

4.2.2.3 The statement of conformity shall be supported by a verification report, which shall be referencedfrom the statement of conformity.


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4.2.3 Verification report

4.2.3.1 A verification report may be issued by DNV GL as a statement confirming the conclusion of theverification process. A verification report may in principle be issued at any stage of the verification process.

4.2.3.2 A verification report shall be issued in conjunction with a statement of conformity.

4.2.3.3 A verification report may be in the form of a close-out report covering the completion of a self-contained part of the verification of a pipeline system.

4.2.3.4 A verification report may be the final deliverable if the requirements to a statement of conformity arenot fulfilled or a statement of conformity is not required.

4.2.3.5 Deviations from requirements shall be highlighted in the verification report. In the summary and/or in the introduction, it shall be stated if there are unresolved deviations, with a reference to where in thereport they are addressed in detail. Deviations that are addressed through alternative solutions shall beincluded in the list. Such solutions may imply e.g. operational limitations.

4.2.3.6 In summary, the verification report shall include:

— Reference to the contract under which the work has been carried out.— Product or service description and item number, if relevant.— Application (operational limitations and conditions of use) for which the product is intended.— Verification scope of work, including level of verification involvement, if applicable.— Codes and standards which the product or service has been verified against.— Clear statement of the conclusion from the verification (does it or does it not meet the specified

requirements).— List of documentation on which the verification report is based (reports, drawings, correspondence etc.).— Unresolved deviations/non-conformities (open comments).

4.2.4 Intermediate documents

4.2.4.1 DNV GL may issue intermediate documentation of progress or conclusion related to individualverification elements:

— a document review— a site visit— a test.

4.2.4.2 Intermediate deliverables may be in the form of:

— verification comments (may be listed in VerCom, letter, email or other agreed communication type)— visit report— audit report— survey report— project progress reports.


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SECTION 5 CERTIFICATION SERVICE REQUIREMENTS

5.1 General

5.1.1 Objectives


— an overview of certification service relating to submarine pipeline systems— details of DNV GL’s certification services for submarine pipelines systems.

5.1.2 Scope of work

5.1.2.1 The certification service is described in [1.1.4] and is part of the certification requirements.

5.1.2.2 The process of defining a verification plan with a scope of work is described in [2.4].

5.1.2.3 For a DNV GL certificate of conformity for the design and construction phase, at project completion,the scope of work shall include the verification activities described in the scope of work [3.4], Table 3-1 toTable 3-6 and, if relevant, Table 3-7. The scope of work is further defined by the result of the DNV GL riskassessment and the resulting conclusion with regard to applicable level of involvement. During the projectthe correctness and relevance of the DNV GL risk assessment shall be revisited by DNV GL and if applicablethe level of involvement for parts of the scope shall be adjusted. Additional verification activities may alsoresult from the updated risk assessments. Changes to the scope of work and level of involvement shall bereflected in the formal verification plan.

5.1.2.4 The verification plan shall state clearly the physical boundaries of the pipeline system covered by theverification scope of work. The certificate shall not extend significantly beyond the pipeline system designedaccording to DNVGL-ST-F101, neither shall it include major components not covered in the scope of worktables in Sec.3.

Guidance note:Other non-pressurised components and structures like pipeline manifolds, riser bases and valve protections structures may be partof the verification scope. Guidance for verification involvement is given in other DNV GL service specifications.


5.1.2.5 The verification scope of work for certification service shall be in accordance with the scoperequirements of this service specification. Generally, this verification scope of work should not be amended.

Guidance note:The objective of the certification service is pipeline integrity (see [1.1.4]) and the generic scope of work tables are defined formeeting this objective.Other objectives and other aspects, such as the verification of the environmental impact of the pipeline system, or its suitabilitywith respect to flow capacity and flow assurance, may be included in DNV GL's scope of work, if desired by the customer. However,this work shall then be undertaken as a verification service and defined and reported separately from the certification work.


5.1.2.6 For a DNV GL certificate of conformity to be retained in the operation phase, a certificate withmaintenance conditions, see [5.2.2], the additional scope of work shall include the verification activitiesdescribed in the scope of work [3.5], Table 3-8 to Table 3-9 and, if relevant, Table 3-10. The scope of workis further defined by the result of the DNV GL risk assessment and the resulting conclusion with regard toapplicable level of involvement. During the certificate maintenance period the correctness and relevanceof the DNV GL risk assessment shall be revisited by DNV GL and if applicable the level of involvement for


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parts of the scope shall be adjusted. Additional verification activities may also result from the updatedrisk assessments. Changes to the scope of work and level of involvement shall be reflected in the formalverification plan.

5.1.2.7 Conditions and scope of work for retention of certificate during pipeline operation is further describedin [5.3].

5.2 Certification service documents

5.2.1 General

5.2.1.1 DNV GL may issue certification service deliverables during the execution of the verification scope,and at its completion. The purpose of the deliverables is to document the scope of work performed, and theconclusions reached, by DNV GL. The deliverables pertaining to certification services consist in principle ofthe same type of documents as the verification service deliverables, however, with an overlying certificate ofconformity. Hence, the general hierarchy of documents is typically as illustrated in Figure 5-1.

Figure 5-1 Typical document hierarchy for certification service

5.2.1.2 The types of documents issued by DNV GL for the different stages of the certification process areillustrated in Table 5-1.


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Table 5-1 Pipeline certification – documents provided by DNV GL

Reference standardfor certification Standard DNVGL-ST-F101 Submarine pipeline systems

DESIGN CONSTRUCTION OPERATION

Project phases

Con

cept

ual d

esig

n

Det

ail d

esig

n

Man

ufac

turing

of lin

epip

e

Man

ufac

turing

of pi

pelin

eco

mpo

nent

s an

d as

sem

blie

s

Man

ufac

turing

of co

rros

ion

prot

ectio

n an

d w

eigh

t co

atin

g

Inst

alla

tion

Proj

ect

com

plet

ion

Com

mis

sion

ing,

ope

ratio

n,m

odifi

catio

ns a

nd r

epai

r

Types of certificationdocuments provided Verification

reportStatement of conformity for individual

phase or natural part thereof

Certificateof

conformity

Certificate ofconformity(retention)

5.2.2 Certificate of conformity

5.2.2.1 A certificate of conformity may be issued by DNV GL as a formal statement confirming thatverification of documents and activities has concluded that the pipeline system has been designed andconstructed in accordance with specified requirements, i.e. with a positive conclusion on the verification workand without pending verification comments. The certificate of conformity shall, as a main rule, cover thecomplete pipeline system and be issued upon successful completion of the verification scope of work for thecertification.

5.2.2.2 A certificate of conformity may be issued with maintenance conditions for retention of the certificateduring the operation phase of a pipeline system, see [5.3].

5.2.2.3 The certificate of conformity shall be supported by statements of conformity and/or one or moreverification reports, which shall be referenced from the certificate of conformity.

5.2.2.4 In cases where only one statement of conformity would be required, the statement of conformityshould be omitted.

5.2.2.5 The certificate of conformity is valid on the date of issue, unless it has been issued with maintenanceconditions and specified validity period, see [5.3].

5.2.3 Statement of conformity

5.2.3.1 A statement of conformity may be issued by DNV GL as a statement confirming that verification ofdocuments and/or activities has concluded that the object complies with specified requirements. In order forDNV GL to issue a statement of conformity the following requirements apply:

— It shall cover the complete, integrated installation/facility or a major self-contained part of it. Major self-contained part shall mean a complete system, or the integration of more systems, to which risk basedverification is or may be applied.


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— It may be issued upon completion of the total verification scope, or at completion of logical phases, e.g.design or fabrication.

— There shall not be omissions in the verification scope which may lead to misinterpretation of thestatement of conformity, e.g. in the design verification scope aspects like safety or structural integrity maynot be omitted from individual components or systems.

— There shall be no unresolved deviations, i.e.; no open verification comments, which inherently infringe thesafety and/or integrity of the pipeline system.

— The statement is valid on the date of issue.

5.2.3.2 Alternatives to detailed requirements/solutions specified in DNV GL standards may be accepted byDNV GL provided the pipeline integrity and reliability level is documented to be equivalent or better than thespecified requirements/solutions. This principle of equivalence does not apply to verification against non-DNVGL reference documents.

5.2.3.3 The statement of conformity shall be supported by a verification report, which shall be referencedfrom the statement of conformity.

5.2.3.4 In case a statement of conformity, according to the contract, shall not be issued, other documentsissued by DNV GL, like the accumulated verification reports, verification letters, status reports etc. mayconstitute the appropriate supporting documentation for the certificate of conformity. Such documentsshall then be referenced from the certificate of conformity, e.g. in the form of an attached list of relevantdocuments. Traceability shall be ensured.

5.2.4 Verification report

5.2.4.1 Verification as part of a certification service shall be documented by a verification report, see [4.2.3].A verification report may be issued by DNV GL as a statement confirming the conclusion of the verification.

5.2.4.2 A verification report shall be issued in conjunction with a statement of conformity and/or a certificateof conformity.

5.2.5 Intermediate documents

5.2.5.1 DNV GL may issue intermediate documentation of progress or conclusion on individual verificationelements. For description of intermediate documents see [4.2.4].

5.3 Retention of pipeline certificate

5.3.1 General

5.3.1.1 The certification service may include verification in order to retain the pipeline certificate during theoperations phase.

5.3.1.2 A prerequisite for the retention of validity of pipeline certificate in the operations phase is that an in-service contract has been established between the owner and DNV GL.

5.3.1.3 Retention of the pipeline certificate may only take place if the certificate is issued with maintenanceconditions.


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5.3.2 Certificate of conformity with maintenance conditions

5.3.2.1 A DNV GL certificate of conformity with maintenance conditions may be issued by DNV GL as aformal statement confirming that verification of documents and activities has concluded that the pipelinesystem has been designed, constructed, commissioned and is operated in accordance with specifiedrequirements. In addition to this statement, the pipeline certificate with maintenance conditions shallcontain:

— conditions of validity— signature positions for confirmation of annual assessment.

5.3.2.2 The period of validity of a pipeline certificate shall not exceed 5 years. After that period the pipelinecertificate may be reissued, provided a satisfactory overall condition assessment has been carried out.

5.3.3 Requirements for pipeline certificate retention

5.3.3.1 A pipeline systems in operation may retain the pipeline certificate provided:

— the owner provides documentation from commissioning, operation, inspection and maintenance activitiesto demonstrate continued compliance with the design assumptions

— the owner maintains any installed systems for condition monitoring and carries out condition evaluationsas applicable

— information about damages, repairs and modifications, which may affect the certification, is promptlyreported to DNV GL

— any nonconformity report issued by DNV GL is acted upon within the specified time.

5.3.3.2 The customer (operator/owner) shall provide DNV GL with the plans, specifications and proceduresconcerning operation, inspection and maintenance activities for acceptance. DNV GL acceptance is requiredfor:

— operating and maintenance procedures and revisions to them— inspection programmes and requirements— inspection scopes of work— condition monitoring programmes.

5.3.3.3 The customer shall provide DNV GL with:

— relevant operation reports— inspection results— condition monitoring report findings.

5.3.3.4 The customer shall notify DNV GL immediately if:

— the pipeline system is damaged, or is suspected of having been damaged in a manner likely to impair thepipeline integrity

— the pipeline system demonstrates signs of deterioration likely to impair its integrity— the pipeline system is to be subjected to any modifications or repairs, which may impair its integrity— the pipeline is abandoned.

5.3.3.5 The pipeline certificate may be withdrawn if the customer fails to:

— comply with the operational procedures accepted by DNV GL— carry out the regular in-service inspection and maintenance programme according to the procedures

accepted by DNV GL— comply with any nonconformity report issued by DNV GL.


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— inform DNV GL as required by [5.3.3.3] and [5.3.3.4], and/or the pipeline integrity is assessed by DNV GLto be or become impaired.

5.3.3.6 Once a nonconformity report is issued by DNV GL, the validity of the certificate of conformity isconditional upon successful completion of the required corrective action within a specified time limit. Thecustomer shall notify DNV GL upon the implementation of corrective actions, to enable DNV GL to verify thework.

5.3.3.7 A verification report shall be issued upon verification of any modification or repair of the pipelinesystem. No new pipeline certificate will be issued.

5.3.3.8 Pipeline systems that are temporarily out of service shall be subject to periodical inspections if thepipeline certificate is to be retained. The inspection requirements and re-commissioning procedures shall besubject to DNV GL’s acceptance prior to re-start.

5.3.3.9 If the conditions leading to withdrawal of the pipeline certificate no longer exists, the pipelinecertificate may be reinstated. The pipeline system may be subject to special assessment or monitoring priorto and following reinstating of the pipeline certificate.


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APPENDIX A

A.1 General

A.1.1 General principles

A.1.1.1 The selection of the level of verification involvement depends on the criticality of each of theelements that have an impact on the management of risks to the pipeline system.

A.1.1.2 The verification process shall direct greatest effort towards those elements of the pipeline systemwhere the risk is highest and whose failure or reduced performance will have the most significant impact on:

— pipeline integrity— safety risks— environmental risks— business risks.

A.1.1.3 Suitable selection factors include, but are not limited to, the:

— overall safety objectives for the pipeline system— assessment of the risks associated with the pipeline and the measures taken to reduce these risks— degree of technical innovation in the pipeline system— experience of the contractors in carrying out the work— quality management systems of the owner and its contractors.

A.1.1.4 Due to the diversity of various pipeline systems, their contents, their degree of innovation, thegeographic location, et cetera, it is not possible to give precise instructions on how to decide what level ofverification involvement is appropriate for each particular pipeline system.

A.1.1.5 Therefore, guidance is given as a series of questions that should be answered when deciding theappropriate level of verification involvement for a pipeline system. This list is not exhaustive and otherquestions should be added to the list if appropriate for a particular pipeline system.

A.1.1.6 It must be emphasised that the contribution of each element should be judged qualitatively and/or quantitatively. Preferably quantified risk assessment data should be used to provide a justifiable basis fordecisions.

A.1.1.7 Depending of the stage of the project, the activities may not have taken place yet, in which case thequestions can also be posed in another form, i.e. “Is …. planned to be?”

A.2 Trigger questions

A.2.1 Overall safety objective— Does the safety objective address the main safety goals?— Does the safety objective establish acceptance criteria for the level of risk acceptable to the owner?— Is this risk (depending on the pipeline and its location) measured in terms of human injuries as well as

environmental, economic and political consequences?


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A.2.2 Assessment of risk— Has a systematic review been carried out to identify and evaluate the probabilities and consequences of

failures in the pipeline system?— Has this review judged the contribution of each element qualitatively and quantitatively and used, where

possible, quantified risk assessment data to provide a justifiable basis for any decisions made?— Does the extent of the review reflect the criticality of the pipeline system, the planned operation and

previous experience with similar pipeline systems?— Does this review identify the risks associated with the operation of the pipeline system and with the health

and safety of personnel associated with it or in its vicinity?— Has the extent of the identified risks been reduced to a level as low as reasonably practicable by means of

one or both of:

— reduction in the probability of failure— mitigation of the consequences of failure?

— Has the result of the systematic review of the risks been measured against the owner’s safety objective?

— Has the result of this review been used in the selection of the appropriate verification involvement level?

A.2.3 Technical innovation— Has the degree of technical innovation in the pipeline system been considered?— Has it been considered that risks to the pipeline are likely to be greater with a high degree of technical

innovation than with a pipeline designed, manufactured and installed to well-known criteria in well-knownwaters?

— Have factors been considered in the selection of the appropriate level of verification involvement such as:

— degree of difficulty in achieving technical requirements— knowledge of similar pipelines— effect of the new pipeline on the surrounding area?

A.2.4 Contractors’ experience— Has the degree of risk associated with the pipeline system been considered where design, construction or

installation contractors are inexperienced?— Has the degree of risk been considered where the contractors are experienced but not in similar work?— Has the degree of risk been considered where the work schedule is tight?

A.2.5 Quality management systems— Have all parties involved in the pipeline system implemented an adequate quality management system to

ensure that gross errors in the work are limited?— Do these parties include the:

— owner— design contractor— construction contractors— installation contractor— operator?

— Do the factors considered when evaluating the adequacy of the quality management system include:

— whether or not an ISO 9001 or equivalent certified system is in place— results from external audits


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— results from internal audits— experience with contractors’ previous work— project work force familiarity with the quality management system?


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APPENDIX B GENERIC DESCRIPTION OF PROJECT SUB-PHASES

B.1 General

B.1.1 Introduction

B.1.1.1 A great deal of confusion can occur in projects over the precise definition of the various projectphases. The terms are not, by themselves, important provided that everybody working on a particular projecthas a consistent understanding of the definitions of the project sub-phases.

B.1.1.2 Some examples of descriptions of project sub-phases or milestones are given below. Thesedescriptions are not intended to be universal definitions, but are given as suggestions as to how particularproject specific definitions may be formulated.

B.2 Initial studies

B.2.1 Feasibility study

B.2.1.1 A feasibility study is a study directed at evaluation of the feasibility of one or more concepts.

B.2.1.2 The feasibility study is an evaluation of one or more proposed technical concepts against projectcost and schedule. It should identify special technical problems and indicate the solution or solve these to thedegree necessary to confirm the feasibility of the project cost and schedule.

B.2.1.3 The feasibility study shall address all essential cost and schedule aspects, and should conclude onwhat the most uncertain factors are and how they should be approached. It should preferably also addressaspects such as environmental impacts, special legislation etc. that are peripheral to pipeline integrity.

B.2.2 Concept study

B.2.2.1 A concept study is a design made to establish the main dimensions and data of the pipeline.

B.2.2.2 These include, for example, diameter, wall thickness, design pressure segmentation, stabilityrequirements, material type, corrosion protection and operation philosophy. Other aspects includeestablishment of a route corridor and identification of possible needs for major intervention works and/or(additional) surveys. In short, the study has to establish the basic parameters for the work to be performedin the next stages of design and a means for more detailed cost estimation and possibly comparison of anumber of concepts detailed to the same level.

B.2.2.3 It is expected only to indicate the preferred/possible methods or solutions of how to solve landfallzones, connection, installation, dropped object/trawl protection, expansion, major intervention etc. On thisbasis it is expected that the concept study documentation identifies how far the design has reached, whatneeds to be further detailed/investigated and how the designer foresees the use of the given information aspart of the subsequent design.


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B.3 Design

B.3.1 Front end engineering design/basic design

B.3.1.1 Basic design is a design made to establish the main dimensions and data of the pipeline to a levelwhere it is possible to make a detailed cost estimate and to place fabrication orders without taking anysignificant economic risk.

Guidance note:The design phase is typically be split into FEED-phase, basic design and detail design. For each design phase, the same designtasks are repeated, but to a successively increasing specific and detailed level.


B.3.1.2 The following should be defined; approximate route, diameter, wall thickness, design pressuresegmentation if applicable, stability requirements, isolation/cooling requirements, corrosion protection,material type and total length of required linepipe, type and number of buckle arrestors, number and depthof crossings, required seabed preparations, landfall design, dropped object/trawl protection requirements,number and type of tie-ins and installation requirement, pre-commissioning and commissioning philosophies,safety systems and operation philosophies.

B.3.1.3 On this basis, it is expected that a large part of the basic design documentation will be the finaldesign documentation and that it identifies what needs to be further detailed/investigated and how this shallbe done by the designer.

B.3.2 Detail design

B.3.2.1 Detail design means the finalisation of design. It can entail all stages of design, as it does notnecessarily have to be preceded by another distinct phase. It shall address all design issues for all items ofthe pipeline system and finalise all the specifications for the subsequent production phases.

B.4 Other phases

B.4.1 General

B.4.1.1 Descriptions of other project phases, such as construction (manufacturing, fabrication, installationand pre-commissioning), commissioning and operations are not given, as there is rarely any confusion oftheir meaning or extent.


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APPENDIX C EXAMPLES OF VERIFICATION AND CERTIFICATIONDOCUMENTS

C.1 General

C.1.1 Introduction

C.1.1.1 This appendix includes example forms for use by DNV GL relating to verification and certificationservices pertaining to pipeline systems.

C.1.1.2 The following forms are included:

— certificate of conformity— statement of conformity.


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C.1.2 Certificate of conformity

EXAMPLE


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C.1.3 Statement of conformity

EXAMPLE


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APPENDIX D DETAILED SCOPE OF WORK TABLES FORVERIFICATION AND CERTIFICATION

D.1 General

D.1.1 Introduction

D.1.1.1 This appendix gives the format of the detailed scope of work tables that should be made for eachparticular project.

D.1.1.2 The detailed project-specific scope of work tables for the chosen level of verification involvementshould be based on these tables. For pipeline project scenarios or components not covered in this appendix,similar tables with the same degree of details shall be made.

D.1.1.3 If any of the activities are moved from one phase to another, then this must be identified in the tablewhere it is removed. Similarly, the detailed table for the phase to where it is moved shall be amended.

Guidance note:Typically, contractual boundaries may give natural splits of activities between phases. However, then it is even more important toensure that there is traceability as to which phases what activity belong and that this is conveyed to all involved parties.


D.2 Description of terms used in the scope of work tables

D.2.1 General

D.2.1.1 The following abbreviations and definitions have been used:

— X is part of scope; attendance at meeting, issue report, etc.— A is audit— S is surveillance— I is for information— R is review.

D.2.1.2 These abbreviations are DNV GL’s preferred terms and should be used in DNV GL-generateddocuments. However, other terms, for example monitoring or witnessing, may be used by DNV GL if theseare the terms commonly used in documents, such as inspection and test plans, generated by others. In thatcase, it is expected that these other terms are defined in these documents.

D.2.2 Audit

D.2.2.1 Systematic, independent and documented process for obtaining audit evidence and evaluating itobjectively to determine the extent to which audit criteria are fulfilled (see ISO 9001: 2008).

Guidance note:This activity differs from the surveillance by being focused on the adherence to and completeness and robustness of theprocedures and not on the actual result of the procedure (although this is not ignored). Further, the audit is normally a one-offactivity as opposed to the continuity in monitoring.



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D.2.3 Review

D.2.3.1 Systematic examination of reports and documentation. The depth of review will depend on the typeof document, any independent analyses/calculations performed by DNV GL, project phase and the level ofverification involvement. In principle, it is the solutions for the design, construction and operation elementsdescribed in the documents that shall be verified.

D.2.3.2 The documents shall be divided into verification documents and reference documents. Verificationdocuments are the documents DNV GL shall verify. Reference documents are the documents against whichthe verification documents are verified. DNV GL may rely on the information in the reference documents andshall have no obligation to review, evaluate or verify this information. DNV GL may notify the customer of anerror in a reference documents, however, this does not mean that DNV GL reviewed, evaluated or verified thereference document.

D.2.3.3 The following shall be used to describe the extent of the examination if not otherwise specificallydefined:

I = for information onlyR1 = for review of principles and general aspects, spot checks of input/output dataR2 = for comprehensive review

Guidance note:Dependent on the project phase and kind of document, a comprehensive review (R2) may constitute review of details of thedocument, and/or a verification of the interaction between conclusions from different documents and the totality of the design.Review of production records does not guarantee their correctness. It is a confirmation to DNV GL that the manufacturer and/orsub-contractor has performed the required activity and issued a report.


D.2.3.4 Reports that are reviewed by DNV GL shall, unless otherwise agreed, not be signed and stamped.

D.2.4 Surveillance

D.2.4.1 Continual monitoring and verification of the status of an entity and analysis of records to confirmthat specified requirements are being fulfilled.

Guidance note:Other commonly used terms for surveillance are monitoring or witnessing.


D.2.4.2 The amount of work involved in surveillance is not described in detail in the tables. This shall be partof the final contractual scope of work which shall define the frequency of surveillance based on the overallsurveillance and the quality control performed by other parties as well as DNV GL’s experience.

D.2.4.3 The following shall be used to describe the frequency if not otherwise specifically defined:

— S1 = surveillance on a visit basis, e.g. once per week— S2 = surveillance frequency minimum once per day— S3 = surveillance frequency minimum once per shift.

Guidance note:These surveillance frequencies should be modified to correspond with production work flow.



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D.3 Overall project management

D.3.1 General

D.3.1.1 The project quality management system documentation shall be available at the early stages of theproject, preferably before design is underway, to ensure that the necessary controls are in place.

D.3.2 Detailed scope of work for overall project management

D.3.2.1 A detailed scope of work for verification the overall project management at different levels ofinvolvement is given in Table D-1.

Table D-1 Overall project management

Level of involvementItem Description

Low Medium High

1 Review of project quality management documentation R1 R2 R2

2 Audit of project quality management system - A A

3 Review of sub-contractor control - I R1

4 Review of interface controls - I R1

5 Review of methods of information flow - I R1

D.4 Design

D.4.1 General

D.4.1.1 For design verification a list similar to that given in Table D-2 and Table D-4 should be made forspecification of the minimum documentation requirement for each pipeline system.

D.4.1.2 The documentation of the items under general in Table D-2 shall be available at the early stages ofthe design. All the remainder of the documentation listed in Table D-2 and Table D-4 should be completedand be made available to DNV GL, if requested, before a statement of conformity on the design can beissued.

D.4.2 Design verification

D.4.2.1 DNVGL-ST-F101 Sec.3 and DNVGL-ST-F101 Sec.12 specifies that the design and planning for apipeline system shall cover all development phases including construction, operation and abandonment,and that all documentation requirements shall be reflected in a document register. The documentation to beproduced and issues to be covered during design are given in DNVGL-ST-F101 Sec.12.

D.4.2.2 For certification of pipeline systems, the document register shall be made available to DNV GL foridentification of documents to be submitted for review for all project phases.


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D.4.2.3 Table D-2 describes the issues to be verified and Table D-3 identifies the extent of independentanalyses/calculations included for the different levels of verification involvement.

D.4.2.4 Table D-4 and Table D-5 describe the issues to be verified in relation to flow assurance. This, if notbeing an integrity matter, is offered as an additional verification/certification service.

Guidance note:If the pipeline system is designed for different pressures along the pipeline (segmented design) this should be reflected in theverification scope of work regarding flow assurance, in addition to wall thickness, safety systems, etc.


D.4.3 Low level design verification

D.4.3.1 The initial low level of design verification involvement consists of a detailed document review of thedesign basis, risk assessment/analysis documentation, quality management system documentation and (ifthey exist) method or design philosophy documents. The presumed critical aspects of the project should beidentified by DNV GL from the initial review and conveyed to the customer for discussion and agreement oncorrect understanding.

D.4.3.2 The subsequent verification consists of document review of the calculations/analysis methods usedto conclude the critical aspects. Other design documents are used as information and a few should be spotchecked for confirmation of the quality control.

D.4.3.3 Verification of implementation of the conclusions from design calculations/reports into specificationsand drawings is not included.

D.4.4 Medium level design verification

D.4.4.1 Medium level of design verification involvement consists of a review of all main design documentsrelated to pipeline safety and integrity. Less critical aspects shall be spot checked. The review shall bedetailed for all critical aspects and independent checks shall be performed.

D.4.4.2 Verification of implementation of the conclusions from design calculations/reports into specificationsand main drawings shall be included on a spot check basis.

D.4.5 High level design verification

D.4.5.1 High level of design verification involvement consists of a full review of most of the produceddocuments related to pipeline integrity. The review shall be detailed for all critical aspects and independentchecks shall be performed.

D.4.5.2 Verification of implementation of the conclusions from design calculations/reports into specificationsand main drawings shall be included.

D.4.5.3 The main specifications shall also be checked for clearness and unambiguity.

D.4.6 Scope of work for design

D.4.6.1 Detailed scope of work for design is given in Table D-2, Table D-3, Table D-4 and Table D-5.


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Table D-2 Pipeline integrity design


Low Medium High

General

1 Safety objective I I I

2Confirmation that the different contractors and sub-contractors’ qualitysystems meet the requirements of ISO 9001 (or approved equivalentsystem)

I R1 R2

3 Overall project organisation I I R1

4 Risk assessment and identification of critical aspects R2 R2 R2

5 Document register I I R1

Structural (main)

6 Design basis R1 R2 R2

7 Pipeline routing I R1 R2

8 Geohazards I R1 R2

9 3rd party interference assessment I R2 R2

8 Physical and chemical characteristics of fluid I I R1

9 Materials selection including internal corrosion assessment (linepipe andcomponents) R1 R1 R2

10 Temperature/pressure profile (hydraulic/thermal analyses) I R1 R2

11 Wall thickness calculations R2 R2 R2

12 Stability R1 R2 R2

13 Pipeline expansion R1 R1 R2

14 Free span assessment R1 R2 R2

15 Upheaval buckling assessment R1 R2 R2

16 Lateral snaking assessment R1 R2 R2

17 Crossing design R1 R1 R2

18 Tie-in design, expansion spool calculations R1 R2 R2

19 Shore crossing assessment R1 R1 R2

20 Trawl interaction R1 R2 R2

21 Preliminary installation analyses R1 R2 R2

22 Trenching assessment - I R1

23 Spare philosophy - I R1

24 Fixed riser strength analyses R1 R2 R2

25 Fixed riser supports design - I R1


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Low Medium High

Structural (components)

26 Pig launcher/receiver design I R1 R1

27 Flange calculations I R1 R2

Valves design I R1 R228

— Finite element analysis - I R2

29 T-joints, isolation joints, etc. I R1 R2

Structural drawings

30 Pipeline route drawings I R1 R1

31 Detailed pipeline crossing drawings I R1 R1

32 Platform layout drawings I R1 R1

33 Spool drawings I R1 R2

34 Pipeline protection drawings I R1 R2

35 Riser and riser clamp drawings I R1 R1

Linepipe and pipeline components (including welding)

36 Linepipe specifications R1 R1 R2

37 Welding specifications I R1 R2

38 Material take off/data sheets - I R1

Corrosion control systems and weight coating

39 Cathodic protection design report R1 R1 R2

40 Anode manufacturing and installation specifications I R1 R1

41 Coating manufacturing specifications I R1 R1

42 Field joint coating specification(s) I R1 R1

43 Corrosion monitoring system specification I R1 R1

44 Material take off/data sheets - I R1

Pipeline control and safety systems

45 Pipeline control and safety system philosophy R1 R1 R2

46 Functional safety management plan R1 R1 R2

47 Safety integrity level (SIL) allocation report for the pipeline safety system I R1 R2

48 Safety requirementssSpecification I R1 R2

49 SIL verification report I R1 R1

50 Pipeline control system (PCS) functional design specification I R1 R1

Flow assurance, if not specified according to Table D-4 and Table D-5


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Low Medium High

51 Flow assurance, including internal corrosion assessment - I R1

Table D-3 Independent analyses/calculations for pipeline integrity design

Level of involvementItem Activity Description

Low Medium High

1 Wallthickness

Wall thickness design calculations performed according to theapplicable code x x x

2 Spot check simplified calculations according to DNVGL-RP-F109 (x) x

3

StabilityDynamic non-linear FE analyses and assessment according toDNVGL-RP-F109 (x) x

4 Spot check simplified calculations according to DNVGL-RP-F105 (x) x

5

Free spanassessment Free span assessment according to DNVGL-RP-F105 based on

non-linear FE analyses (x) x

6 Simple hand calculations assuming uniform input along thepipe (x) x

7

Expansion

Non-linear FE analyses (x) x

8 Simple calculations according to DNVGL-RP-F110 (x) x

9

Upheavalbuckling Non-linear FE analyses and assessment according to (x) x

10 Simple calculations according to DNVGL-RP-F110 (x) x

11

Lateralbuckling Non-linear FE analyses and assessment according to DNVGL-

RP-F110 (x) x

12 Simple calculations based onDNVGL-RP-F111 (x) x

13Trawling Non-linear FE analyses and assessment according to DNVGL-

RP-F111 (x) x

14 Static FE analysis and assessment of load effects (x) x

15Installation

Static and dynamic FE analysis and assessment of load effects (x) x

16 Spoolanalyses FE analysis (x)

17 Riseranalyses Static FE analysis (of fixed risers only) (x) x

18 Soilassessment

Calculate pipe-soil characteristic to be used in other designcalculations (x) x

19 Corrosionprotection

Cathodic protection analysis according to applicable code andproject specifications (x) x


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Low Medium High

20 Internalcorrosion Assessment of internal corrosion mechanisms (x) x

x = analysis/check should be included in the scope of work (as applicable)

(x) = analysis/check should be included in the scope of work if the issue is identified as critical or highly utilised.Then final decision of inclusion in scope of work will be a result of the document review of simple analysis.

Table D-4 Flow assurance design


Low Medium High

Design basis

1 Pipeline topography I I R1

2 Pipe dimension, wall thickness, internal roughness I R1 R1

3 Insulation (thickness), trenching, embedment I R1 R1

4 Material properties for soil, insulation, pipe, weight coating (thermalconductivity, heat capacity, density) R1 R1 R1

5 Environmental conditions (meteocean data) I I R1

6 Production profiles (along the pipeline if segmented design) I I R1

7 Hydrocarbon composition, water cut, equation of state (EoS) R1 R1 R1

8Operational requirements (arrival pressure and/or temperature, inletpressure and/or temperature, cool-down time, slug sizes, WDP, HDP,capacity)

R1 R1 R1

9 Subsea templates/expansion loops I I R1

Steady state thermo-hydraulic report

10 Pipeline model I R1 R1

11 Pipe dimension/capacity of pipeline R1 R1 R1

12 Steady state pressure and temperature profiles R1 R1 R1

13 Flow regimes/slugging1) R1 R1 R1

14 Anode temperatures I R1 R2

15 Heating R1 R1 R1

16 Pipeline insulation system R1 R1 R2

17 Overall heat transfer coefficient R1 R1 R2

18 Hydrate analysis R1 R1 R1

19 Wax formation analysis R1 R1 R1

20 Sizing of methanol/glycol injection system R1 R1 R2


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Low Medium High

21 Effect of pipeline trenching and soil properties R1 R1 R2

Other Aapects

22 Sand accumulation R1 R1 R1

23 Erosion in piping system R1 R1 R1

24 Erosion of chokes and valves R1 R1 R2

25 Internal corrosion R1 R1 R1

26 Asphaltenes1), scale1), black/white/red powder2) I R1 R1

Transient thermo-hydraulic report

27 Terrain slugging1) R1 R1 R2

28 Shut-down of pipeline R1 R1 R1

29 Pressure surges/water hammer R1 R1 R1

30 Cool-down time at shut-down R1 R1 R2

31 Liquid hold-up during shut-down R1 R1 R1

32 Initial and warm start-up of pipeline R1 R1 R1

33 Flowrate variation (ramp up and ramp down), packing and unpacking,blowdown) R1 R1 R1

34 Heating of pipeline R1 R1 R2

35 Liquid surging at transient operation R1 R1 R1

36 High integrity pressure protection system (HIPPS) or pipeline safety system R1 R1 R1

37 Update of steady state report and transient report based as-laid survey. I R1 R2

Notes:

1) Applicable for multiphase pipelines

2) Applicable for gas pipelines.

Table D-5 Independent analyses/calculations for flow assurance


Low Medium High

1 Checking of input values, program system used and briefassessment of results x x x

2 Simple calculations based on empirical formulae/spread-sheetmodels x x

3

Capacity/pipe

dimensionIndependent calculations with appropriate multi-phaseprogram x


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Low Medium High



6

Pressure/temperature

profiles

Anodetemperature Independent calculations with appropriate multi-phase

program system x


8

Hydrate/wax

analysis Independent calculations with appropriate process simulationand multi-phase program systems (x) x



11

Insulationsystem

Over-all

U-value,

Effect oftrenching

Independent calculations with appropriate multi-phaseprogram (x) x

12 Corrosionassessment

Independent calculations with appropriate multi-phaseprogram (x)

13

Erosionassessment

Pipingsystem,chokes

Independent calculations with appropriate program system (x)

14 Sandaccumulation

Independent calculations with appropriate multi-phaseprogram (x)


16

Transientanalysis

Start up,shut down,flow ratevariation,packing,

blowdown

Independent calculations with appropriate transient multi-phase program system (x) x

17 Independent calculations with appropriate transient multi-phase program system (x) x

18

Transientanalysis

Cool-down,heating


19 Checking of input values, program system used and briefassessment of results (x) (x) x

20

Transientanalysis

Pressuresurges,

HIPPS

Independent calculations with appropriate transient multi-phase program system (x)


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Low Medium High


22

Transientanalysis

Terrainslugging,

liquid

hold-up,

liquidsurges


x = analysis/check should be included in the scope of work (if relevant)

(x) = analysis/check should be included in the scope of work if the issue is identified as critical or highly utilised.Then final decision of inclusion in the scope of work shall be a result of the document review of simpleanalysis.

D.5 Construction

D.5.1 General

D.5.1.1 Construction consists of a number of different site activities and their associated documentation.

D.5.1.2 Table D-6 and Table D-7 give summaries of the scope of work tables included in this section forvarious construction activities.

D.5.1.3 For construction, verification lists similar to those shown hereafter shall be made for the specifics ofthe particular project.

D.5.2 Construction verification

D.5.2.1 DNVGL-ST-F101 Sec.12 specifies the documentation to be submitted before, during and afterconstruction.

D.5.2.2 For verification of pipeline systems construction activities are considered as:

— initial activities— inspection activities— final activities.

D.5.2.3 The initial activities include the review of procedures, attendance during qualification of procedures(e.g. MPQT, WPQT) and personnel (e.g. welders) and other start-up activities. The inspection activities arethe site or vessel attendance and the final activities are the (continuous) review of production results/recordsand the completion of documentation and reports.

D.5.3 Low level construction verification involvement

D.5.3.1 For low level verification involvement, the procedure review consists of a review of the constructionmanagement procedures and confirmation that the most important aspects of the main specifications have


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been included in the procedures. For the qualification of procedures and personnel DNV GL will not attend theactual qualification, but shall review the results.

D.5.3.2 During the construction, DNV GL’s verification will be performed during site or vessel visits. Theverification shall focus on the critical items/aspects identified in the detailed scope of work tables.

D.5.3.3 The subsequent verification of the final activities should be by spot-checks of the production recordsincluding nonconformity logs, and results from audits, both contractors internal audits or audits performed byother parties.

D.5.4 Medium level construction verification involvement

D.5.4.1 For medium level verification involvement, the procedure review consists of a detailed review ofconstruction management procedures. Other procedures and analysis documents shall be spot checked toconfirm that the most important aspects of the specifications have been included.

D.5.4.2 For the qualification of procedures and personnel DNV GL shall visit the main qualifications andreview the results.

D.5.4.3 During construction, DNV GL’s verification shall be performed by attendance at the main sites orvessels, normally limited to one shift per day. The verification should focus on the critical items/aspects asidentified in the detailed scope of work tables.

D.5.4.4 Verification of the final activities shall be by review of the production records includingnonconformity logs, and results from audits, both contractor’s internal audits or audits performed by otherparties, from the main sites and spot checks of the same from other important sites.

D.5.5 High level construction verification involvement

D.5.5.1 For high level verification involvement, the procedure review consists of a detailed review ofconstruction management procedures. Other procedures and analysis documents, if relevant, shall bechecked to confirm that important aspects of the specifications have been included.

D.5.5.2 For qualification of procedures and personnel DNV GL shall attend the main qualifications, visit otherqualifications and review the results.

D.5.5.3 During construction, DNV GL’s verification shall be performed by full time (all shifts) attendance atthe main sites or vessels and by visits to the other important sites. Verification should focus on the criticalitems/aspects as identified in the detailed scope of work tables.

D.5.5.4 Verification of the final activities shall be by review of the production records including thenonconformity logs, and results from audits, both contractors internal audits or audits performed by otherparties, from the main sites and spot checks of the same from other important sites.

D.5.6 Verification of work in progress

D.5.6.1 The monitoring by the owner during construction typically relates to the activities of the contractor.The monitoring of these activities by DNV GL relates not only to the contractor’s activities but also to themonitoring of these activities carried out by the owner.

D.5.6.2 The emphasis placed on the various activities in the verification plan varies depending on:

— any areas of concern revealed during design verification— any areas of concern revealed during the audit of the owner’s or contractor’s quality management systems


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— the progress of construction— the findings of the contractor surveillance personnel.

D.5.6.3 Many contractors have adequate quality control systems and quality control departments, withcompetent personnel to perform, for example, inspection at mills and coating plants and specialist materialengineers competent to review and verify the performance of mills. In that case, not all verification workneeds be done by DNV GL personnel. Where applicable, the various inspections may be carried out bycompetent persons other than DNV GL personnel. In that situation DNV GL’s verification activities can beconfined to:

— reviewing the competence of the contractor’s personnel— auditing their working methods and their performance of that work— reviewing the documents produced by them.

D.5.6.4 DNV GL personnel shall focus on areas where problems have occurred, or are considered likely tooccur. Conversely, less effort is spent in areas where the likelihood of problems is considered lower.

D.5.7 DNV GL final verification report

D.5.7.1 The scope of work tables for construction normally include a last item entitled Issue of DNV GLclose-out report. This item is not related to the production process, but intended as a reminder to the DNVGL (or others) inspection personnel that a final report of their verification activities is required to finish thework.

D.5.8 Detailed scope of work for constructionTable D-6 Construction summary table - fabrication

Table no. Table description

D-8 Steel making

D-9 Plate rolling

D-10 Linepipe production

D-11 Buckle arrestor fabrication

D-12 Coating application (external)

D-13 Isolating joint fabrication

D-14 Valves

D-15 Fabrication of pressure containing components, e.g. bends, tees, pig-traps

D-16 Fabrication of non-pressure containing components e.g. anodes, concrete coating

Table D-7 Construction summary table - installation


D-17 Survey: pre-installation, as-laid, as-built

D-18 Qualification of lay barge, marine spread and installation equipment

D-19 Qualification of welding, NDT, field joint coating, procedures and personnel


DNV GL AS


D-20 Pipe storage yard

D-21 Fabrication of temporary equipment, e.g. A&R heads, pulling heads, test heads

D-22 Pipeline installation, incl. onshore pipe jointing and stalk welding as applicable

D-23 Seabed intervention and pipeline protection

D-24 Pre-commissioning

D-25 Pipeline control and safety system

Table D-8 Steel making


Low Medium High

Initial activities

1 Quality management system documents - R1 R2

2 Quality system audit/attend owner’s audit, at relevant manufacturers andsub-suppliers - - A

3 Specifications and procedures R1 R2 R2

4 Attend kick-off meeting/initial technical meetings X X X

5 Verify performance and testing during qualifications - X X

Inspection activities

6 Steel making and slab casting S1 S1 S1

7 Slab inspection macro, non-metallic inclusion verification - S1 S1

8 Slab identifications heat number - S1 S1

9 Chemical analysis (ladle). - S1 S1

Table D-9 Plate rolling


Low Medium High

Initial activities


2 Quality system audit/attend owner’s audit at relevantmanufacturers and sub-suppliers - - A


4 Attend kick-off meeting/initial technical meeting X X X


6 Technical meetings - S1 S1


DNV GL AS


Low Medium High


7 Slab re-heating, rolling and accelerated cooling processes S1 S2 S3

8Automatic ultrasonic inspection

Calibration of equipmentS1 S2 S3

9 Visual inspection S1 S2 S3

10 Identification of test coupons S1 S2 S3

11 Loading and handling - S1 S1

Final activities

11 Review of steel making and plate rolling manufacturing and testingrecords R1 R2 R2

12 Issue of DNV GL close-out report X X X

Table D-10 Linepipe production


Low Medium High

Initial activities

1 Quality management system documents R1 R1 R2

2 Quality system audit/attend owner’s audit at relevant manufacturers andsub-suppliers - - A






7 Material identification (pipe list) and tracking S1 S2 S3

8 Check pipe-forming and bevel S1 S2 S2

9 Welding and consumable handling S1 S2 S2

10 Weld repairs - S1 S2

11 View and interpret X-rays of repairs S1 S2 S3

12 Expanding, review record of expansion ratio - S1 S2

13 Check calibration of gauge R1 R2 R2

14 Hydrostatic test S1 S2 S3

15 End facing and squareness - S1 S1


DNV GL AS


Low Medium High

16 View and interpret X-rays of pipe ends S1 S2 S3

17 Calibration of UT equipment R1 R2 R2

18 Automatic ultrasonic on pipe (longitudinal and transverse) S1 S2 S3

19 MPI - equipment and sensitivity check R1 R2 R2

20 MPI - for pipe ends S1 S2 S3

21 MPI - after repair of pipe body by grinding S1 S2 S3

22 Dye penetrant - check procedures R1 R2 R2

23 Dye penetrant - for pipe ends S1 S2 S3

24 Dye penetrant - after repair of pipe body by grinding S1 S2 S3

25 Wall thickness measurement after repair by grinding S1 S2 S3

26 Ultrasonic of pipe ends - calibration of equipment R1 R2 R2

27 Ultrasonic of pipe ends - ultrasonic inspection of pipe-end (circumference).Both 90 ° and angle probes shall be used S1 S2 S3

28 Dimensional inspection S1 S2 S3

29 Visual external inspection, including cleanliness of inside pipe body S1 S2 S3

30 Weighing of pipe - S1 S1

31 Bevel protectors (if required) - S1 S1

32 Marking - check tracking records, die stamp weld bevel, paint markinternal, colour code external S1 S2 S3

33 Storage of finished pipes - S1 S2

34 Cutting and identification of test coupons S1 S1 S2

35 Mechanical testing of production test pieces S1 S1 S2

36 Check material certificates R1 R2 R2

Final activities

37 Review of manufacturing and testing records R1 R2 R2


Note:

This table defines the scope of work for the verification of longitudinally welded linepipe production. However, it maybe used for seamless linepipe production by omitting all items related to the welding of the longitudinal seam.


DNV GL AS

Table D-11 Buckle arrestor fabrication


Low Medium High

Initial activities








7 Material identification (pipe list) R1 R2 R2

8 Check pipe- forming (forging), heat treatment (Q/T) and machining S1 S2 S2

9 Welding and consumable handling S1 S1 S2

9 Welding of pup-pieces (if required) - S1 S2

10 NDT S1 S2 S3

11 Check calibration of gauge R1 R2 R2

12 Hydrostatic test S1 S2 S3

13 Dimensional inspection as per specification. S1 S2 S3

14 Visual external inspection, including cleanliness of inside pipe body S1 S2 S3

15 Weighing of buckle arrestors - S1 S1


17 Marking - check tracking records, die stamp weld bevel, paint markinternal, colour code external - S1 S2

18 Storage of finished buckle arrestors - S1 S2

19 Removal and identification of test coupons S1 S2 S3

20 Mechanical testing of production test pieces S1 S1 S2


22 Loading and handling - S1 S2

Final activities

23 Review of manufacturing and testing records R1 R2 R2



DNV GL AS

Table D-12 Coating application (external1)


Low Medium High

Initial activities


2 Quality system audit/attend owner’s audit,at relevant manufacturers andsub-suppliers - - A






7 Testing of coating materials R1 R2 R2

8 Examination of pipe prior to surface preparation S1 S2 S3

9 Examination of grit - S1 S1

10 Pre-treatment - temperature, steel temperature humidity during pre-treatment, surface condition S1 S1 S2

11Visual inspection after blast-cleaning for cleaning standard, roughness,surface imperfections, contamination as dust and chlorides, cleanliness,segregation, repair and re-instalment of rejected pipes

S1 S2 S3

12 Coating application - temperature, steel temperature humidity duringpainting application, surface condition S1 S2 S3

13 Curing conditions - S1 S1

14 Paint thickness measurements S1 S2 S3

15 Final inspection and marking of coated pipes S1 S2 S3

16 Coating repair S1 S2 S3

17 Storage and handling of coated pipes - S1 S2

Final activities

18 Review of fabrication and testing records R1 R2 R2

19 Review of testing records R1 R2 R2


Note:

1) As internal coating and concrete coating do not affect the integrity of the pipe, the follow up should be limited tovisit based (S1). Concrete coating is covered by Table D-16.


DNV GL AS

Table D-13 Isolation joint fabrication


Low Medium High

Initial activities


2 Quality system audit/attend owner’s audit,at relevant manufacturers andsub-suppliers - - A






7 Verify chemical composition for carbon steel to ensure sufficienthardenability R1 R2 R2

8 Forging and heat treatment - S1 S2

9 Machining - S1 S2

10 Welding and consumable handling - S1 S2

11 NDT - S1 S2

12 Check calibration of gauge - R2 R2

13 Hydrostatic test - S1 S3

14 Hydraulic fatigue testing - S1 S2

15 Electrical resistant test - S1 S2

16 Dielectric strength test - S1 S2

17 Visual inspection - S1 S2

18 Dimensional inspection as per specification - S1 S2

19 Weighing of insulating joints - S1 S2

20 Marking - S1 S2

21 Storage of finished insulating joints - S1 S2

22 Removal and identification of test coupons - S1 S2

23 Mechanical testing of production test specimen - S1 S2


25 Insulating joint conservation and storage - S1 S2

Final activities

26 Review of fabrication records and testing records R1 R2 R2



DNV GL AS

Table D-14 Valve fabrication (applies to all pressure containing parts)


Low Medium High

Initial activities


2 Quality system audit/attend owner’s audit at relevant manufacturers andsub-suppliers - - A



5 Verify performance and testing during qualification - X X




8 Forging/casting and heat treatment - S1 S2

9 Removal and identification of test coupons S1 S1 S2

10 Mechanical testing of production test specimen S1 S1 S2

11 Machining - S1 S1


13 NDT - S1 S2

14 Hydrostatic test (including check calibration of gauges) - S1 S2


16 Dimensional inspection - S1 S2

17 Weighing of valve - S1 S2

18 Marking - S1 S2

19 Factory acceptance test (FAT) S1 S1 S2


21 Valve conservation and storage - S1 S2

Final activities

22 Review of fabrication records and testing records R1 R2 R2



DNV GL AS

Table D-15 Fabrication of other pressure containing components, e.g. bends, tees, pig-traps


Low Medium High

Initial activities









8 Check forming (forging), heat treatment (Q/T) and machining - S2 S2


10 NDT - S2 S2

11 Check calibration of gauge - R2 R2

12 Hydrostatic test - S2 S2

13 Dimensional inspection as per specification - S2 S3

14 Visual external inspection, including cleanliness of inside pipe body - S2 S2

15 Weighing of final product - S1 S1


17 Marking - check tracking records, dye stamp weld bevel, paint markinternal, colour code external etc. - S1 S1

18 Storage of final product - S1 S1

19 Cutting and identification of test coupons S1 S1 S3

20 Mechanical testing of production test specimen S1 S1 S3


Final activities


23 Issue of DNV GL close-out report - X X


DNV GL AS

Table D-16 Fabrication of non-pressure containing components, e.g. anodes, concrete coating


Low Medium High

Initial activities



3 Specifications and procedures - R2 R2

4 Attend kick-off meeting/initial technical meeting - X X




7 Verify chemical composition for carbon steel to ensure sufficienthardenability (if relevant) - R2 R2

8 Welding and consumable handling, if applicable - S1 S2

9 NDT, if applicable - S1 S2

10 Dimensional inspection - S1 S2


12 Weighing of final product - S1 S2


14 Marking - check tracking records, dye stamp weld bevel, paint markinternal, colour code external etc. - S1 S2

15 Storage of final product - S1 S2

16 Cutting and identification of test coupons - S1 S2

17 Mechanical testing - S1 S2

18 Check material certificates - S1 S2

Final activities




DNV GL AS

Table D-17 Surveys; pre-installation, as-laid, as-built


Low Medium High

Initial activities

1 Quality management system documents - I R1

2 Quality system audit/attend owner’s audit - - A

3 Specifications and procedures I R1 R2

4 Attend kick-off meeting/initial technical meeting. - - X

5 Verify performance and testing during qualifications - - X


6 Pre-installation survey:

— Attend survey - - S1

— Review of survey reports R1 R1 R2

7 As-laid survey:

— Touch down monitoring (via installation vessel) - S2 S2



8 As-built survey:



Final activities

9 Issue of DNV GL close-out report - - X

Table D-18 Qualification of lay barge, marine spread and installation equipment


Low Medium High

Initial activities



3 Review of specifications and procedures R1 R2 R2



5 DP systems (equipment class II and III) - R1 S1


DNV GL AS


Low Medium High

6 Anchoring system - S2 S2

Combined DP/anchoring system - tensioner tests (pull-stop):

— simulate barge pull and tensioner failures - S2 S27

— miscellaneous other redundancy testing during barge pull - S2 S2

Tension system test/calibration:

— calibration R1 S2 S2

— testing of combinations of tensioner testing of single tension failureswhen running two or three tensioners

- S2 S2

— testing redundancy for single tensioners (brakes, tension motors,squeeze pressure system)

- S2 S2

— simulate main power loss - S2 S2

8

— simulate loss of signal power - S2 S2

Abandonment and retrieval winch test/calibration:

— calibration R1 S2 S2

— simulate to test fail safe action - S2 S2

— simulate main power loss - S2 S2

9

— simulate loss of signal power - S2 S2

Test of friction clamps:

— test fail safe actions - S2 S210

— test clamps during barge pull - S2 S2

11 Test of remote operated buckle detector - S2 S2

12 Calibration of measuring devices used for configuration control R1 S2 S2

13 Stinger configuration and control devices R1 S2 S2

14 Maintenance records of critical/essential equipment - R1 R2

Final activities

15 Review of reports and documentation R1 R2 R2



DNV GL AS

Table D-19 Qualification of welding, NDT, field joint coating, procedures and personnel


Low Medium High

Initial activities






Qualification of welding procedure (including repair):

— pWPS, WPQR, WPS R1 R2 R2

— welding equipment type and identification - S1 S2

— base material identification and certificates R1 R2 R2

— bevelling and bevel shape - S1 S2

— line-up and fit-up - S1 S2

— excavation and grinding of repair welds - S1 S2

— welding consumables identification and certificates, re-cycling ofwelding flux, mixture of new and re-cycled welding flux

- S1 S2

— preheat and interpass temperatures - S1 S2

— recording and control of welding parameters - S1 S2

— NDT of test welds S1 S2 S2

— removal and identification of test pieces S1 S2 S2

5

— mechanical testing S1 S2 S2

Welding consumable batch qualification:


— welding consumables identification and certificates R1 R2 R2

— re-cycling of welding flux, mixture of new and re-cycled welding flux - S1 S2

— preheat and interpass temperatures - S1 S2

— control of welding parameters - S1 S2

— removal and identification of test pieces S1 S2 S2

6

— mechanical testing S1 S2 S2

Review of NDT procedures:

— final AUT procedure R1 R2 R27

— manual UT procedures R1 R2 R2


DNV GL AS


Low Medium High

— MPI procedures R1 R2 R2

AUT equipment qualification:

— qualification programme R1 R2 R2

— detailed system description and operation manual R1 R2 R2

— AUT procedure and reporting levels proposed for the qualificationprogramme

- S1 S2

— sound velocity measurements (material from all plate mills) - S1 S2

— calibration block(s) dimensions and tolerances - S1 S2

— welding of test welds with defects and RT/UT to confirm presence ofdefects

- S1 S2

— scanning of SAW, GMAW and repair test welds - S1 S2

— AUT report and selection of areas to be sectioned - S1 S2

— sectioning and defect height/length/location determination R1 R2 R2

— statistical treatment of data and the defect sizing error determined R1 R2 R2

8

— proposed threshold levels R1 R2 R2

Qualification of field joint coating procedures:

— procedure R1 R2 R2

— identification of materials - S1 S2

— surface preparation, temperature check - S1 S2

— application of coating - S1 S2

9

— testing of coating R1 S2 S2

Qualification of external coating repair procedure:





10

— testing of coating repair R1 S2 S2

Qualification of internal coating repair procedure:





11

— testing of coating repair R1 S2 S2


DNV GL AS


Low Medium High

12 Welders’ qualification/certification records R1 R2 R2

13 Welding inspectors’ qualification/certification records R1 R2 R2

14 NDT operators’ qualification/certification records R1 R2 R2

15 Coating inspectors’ qualification/certification records R1 R2 R2

Final activities



Table D-20 Pipe storage yard


Low Medium High

Initial activities

1 Specifications and procedures I R1 R2

2 Attend kick-off meeting/initial technical meeting - - X


Inspection of pipes and key products at assembly yards before load out fortransportation:

— pipe stacking heights in accordance with specification - S1 S1

— pipe ends for damage and end protectors - S1 S1

— condition of coating, degradation and damage - S1 S1

— pipe identification legible, complete and correct - S1 S1

— marking and proper segregation/quarantine of rejected pipe - S1 S1

— repaired pipe and rejected pipe records R1 R2 R2

6

— internal cleanliness of pipe during storage and prior to shipping - S1 S1

Pipe tracking system:

— Implementation of pipe tracking system - S1 S17

— Spot check on recording correctness - S1 S1

8 Receiving inspection of pipe returned from offshore: - S1 S1

9 Storage of repairable pipe in segregated area: - S1 S1

Repair of repairable pipe:

— repair according to accepted procedures - S1 S1

— acceptability of repair - S1 S110

— check of status for repaired pipe in the pipe tracking system - - R2


DNV GL AS


Low Medium High

Final activities

11 Review of reports and documentation - R1 R2

12 Issue of DNV GL visit report - X X

Table D-21 Fabrication of temporary equipment, e.g. A&R heads, pulling heads, test heads


Low Medium High

Initial activities


2 Attend kick-off meeting/initial technical meeting. - - X


Fabrication of temporary equipment:

— material and component certificates - R1 R2

— welding procedure qualification record (WPQR), WPS - R1 R2

— welder qualification - R1 R2

— machining - S1 S2

— welding and consumable handling - S1 S2

— NDT - R1 R2

— visual and dimensional inspection as per specification - S1 S2

— testing - S1 S2

3

— marking - S1 S2

Final activities



Table D-22 Pipeline installation, incl. onshore pipeline jointing and stalk welding as applicable


Low Medium High

Initial activities

1 Quality management system documents I R1 R2

2 Quality system audit/attend owner’s audit - A A

3Installation engineering documents, specifications and procedures, asapplicable:


DNV GL AS


Low Medium High

— Analysis design brief documents R1 R2 R2

— Static pipelay analysis I R1 R2

— Dynamic pipelay analysis I R1 R2

— Abandonment and recovery analysis I R1 R2

— Vessel positioning/mooring analysis I R1 R2

— Shore pull analysis I R1 R2

— ECA (engineering critical assessment) I R1 R2

— Welding repair analysis I R1 R2

— Pipe pull analysis I R1 R2

— Pipe stacking analysis I R1 R2

— Welding procedures I R2 R2

— NDT procedures I R2 R2

— Field joint coating procedures I R2 R2

— Installation procedures; start up, normal lay, abandonment andrecovery, lay down, shore pull R1 R2 R2

— Failure mode effect analysis (FMEA) and HAZOP studies I R1 R2

— Contingency procedures I R2 R2

— ITP (inspection and test plan) I R2 R2

4 HAZID-, HAZOP-meetings - X X

5 Kick-off meeting onboard installation vessel, at site - X X


5 All major equipment tested, qualified and ready for use R1 R2 R2

6 All procedures approved and available R1 R2 R2

7 Valid certification for welding, inspection and NDT personnel R1 R2 R2

8 Pipe tracking system – recording of data - S1 S1

Pipe unloading, receiving inspection and storage:

— pipe identification legible, complete and correct - S1 S2

— conditions of pipes acceptable according to specification, pipe endsundamaged and end protectors in place, coating without degradationand damage.

- S1 S2

— identification, marking, segregation and return onshore of rejectedpipes - S1 S2

9

— pipe stacking heights in accordance with specification - S1 S2


DNV GL AS


Low Medium High

— certification, documentation and status of pipes in contractor’stracking system - S1 S2

Receipt of welding consumables and key products:

— condition acceptable according to specification, packaging undamaged - S1 S2

— identification and certification of welding consumables S1 S1 S210

— storage conditions for welding consumables S1 S1 S2

Repairs of damage to external and internal coating 11

— correct repair R1 S1 S2

Bevelling, cleaning, line-up and welding at welding stations:


— internal cleaning - S1 S2


— welding consumables identification, re-cycling of welding flux, mixtureof new and re-cycled welding flux S1 S1 S2

— welding procedures, control of welding parameters S1 S1 S2

— sequence of anode pipe and buckle arrestors - S1 S2

12

— pipe tracking system entries - - S1

Non-destructive testing:

— equipment calibration - S1 S2

— scanning S1 S1 S2

— interpretation of indications S1 S1 S2

— documentation filing S1 S1 S2

13

— equipment maintenance - S1 S2

Excavation, welding and NDT of repairs:

— excavation length and depth, grinding - S1 S2

— NDT of excavation - S1 S2

— welding consumables identification - S1 S2

— welding procedures, control of welding parameters - S1 S2

14

— NDT of repairs S1 S1 S2

Production tests:

— welding of production tests R1 S1 S2

— NDT of production tests R1 S1 S215

— marking and shipping - S1 S2


DNV GL AS


Low Medium High

Field joint coating:

— material and procedure - S1 S216

— testing of field joint coating - S1 S2

Pipelaying activities

19 Monitoring and recording of laying parameters:

— vessel position - S1 S2

— DP system operation - S1 S2

— anchor pattern - S1 S2

— pull speed - S1 S2

— Tension, settings including dead band S1 S1 S2

— roller loads S1 S1 S2

— vessel trim and draft - S1 S2

— ramp configuration - S1 S2

— water depth - S1 S2

— pipeline catenary configuration - S1 S2

— touch down point monitoring; within route, curves,free spans, pipesupports, crossings, etc. S1 S1 S2

— buckle detection - S1 S2

— operating limit condition parameters - S1 S2

Abandonment and recovery operations:

— removal of internal equipment - S1 S2

— welding of A&R head - S1 S2

— winch tension and wire length - S1 S2

20

— inspection of pipeline prior to resuming laying - S1 S2

Shore pull:

— verify adequate seabed preparation - S1 S2

— installation of pulling head - S1 S2

— pulling force - S1 S2

— tension and wire length - S1 S2

— twisting - S1 S2

21

— ROV monitoring - S1 S2

22 Tie-in operations:


DNV GL AS


Low Medium High

— pre tie-in survey of seabed - S1 S2

— winch tension and wire length during lifting and lowering - S1 S2


— welding, consumables identification, welding procedures, control ofwelding parameters - S1 S2

— Inspection, NDT - S1 S2

— field joint coating - S1 S2

— ROV survey on both sides of tie-in after lowering - S1 S2

Final activities:



Table D-23 Seabed intervention and pipeline protection

Level of involvementItemDescription

Low Medium High

Initial activities

1 Quality management system documents - I R1


3 R1 R1 R2

4

Specifications and procedures

Attend kick-off meeting/technical meeting/HAZOP meeting - X X


5 Rock installation:

— Rock installation schedule R1 R1 R2

— Rock grading check - S1 S1

— Rock installation operations - S1 S1

— Pre- and post-installation surveys - S1 S1

6 Trenching:

— Trenching equipment monitoring system calibration - S1 S2

— Trenching trials, test trench - S1 S2

— Trenching operation parameters - S1 S2

— Operations monitoring - S1 S2

— Post trench survey - S1 S2


DNV GL AS

Level of involvementItemDescription

Low Medium High

7 Other intervention work; grout bags, concrete mattresses, boulderremoval, dredging, etc.:

— Equipment, function testing, lifting certificates - - S1

— Operations monitoring - - S1

— Pre- and post-operation surveys - - S1

Final activities



Table D-24 Pre-commissioning


Low Medium High

Initial activities

1 Quality management system documents - I R



4 Attend Kick-off meeting/technical meeting/HAZOP meeting - X X


Flooding, cleaning and gauging operations:

— Water sampling - S1 S2

— Inhibitor injection - S1 S2

— Pumping pressure and volume - S1 S2

— Gauge plate dimensional check R1 S1 S2

— Calliper pigging, if applicable - S1 S2

5

— Debris assessment - S1 S2

System pressure test:

— Instrumentation and equipment calibration certificates R1 R2 R2

— Pressurisation, pressure and temperatures log - S1 S2

— Air content measurements - S1 S2

— Pressure test/holding period - S1 S2

6

— Depressurisation - S1 S1

Dewatering and drying: 7

— Dewater pigging - - S1


DNV GL AS


Low Medium High

— Drying, if applicable - - S1

Final activities



Table D-25 Pipeline control and safety systems


Low Medium High

Initial activities

1 Detailed design sSpecification and module sesign specifications I R1 R2

2 Verification test plans I R1 R2

3 FAT plans (if applicable) I R1 R2

4 Site validation plans I R1 R2

5 Proof tests plans I R1 R2

6 Functional safety management plan for operations and maintenance R1 R1 R2


7 Witnessing of verification tests - S1 S3

8 Witnessing of FAT (if applicable) S1 S3 S3

9 Witnessing of site validation tests S1 S3 S3

10 Witnessing of proof tests S3 S3 S3

Final activities



D.6 Operation

D.6.1 General

D.6.1.1 Verification during operation is carried out by means of:

— audits— reviews— site visits.


DNV GL AS

D.6.2 Verification in operation

D.6.2.1 The documentation to be produced and issues to be covered during operation are given in DNVGL-RP-F101 Sec.12.

D.6.2.2 The document register shall be made available to DNV GL for identification of documents forsubmission for review.

D.6.2.3 For retention of pipeline certificate, the main activities and timing within a five (5) year cycle consistof regular follow-up, yearly assessments and 5 yearly update of pipeline certificate.

D.6.2.4 Table D-26 describes the issues to be verified and Table D-27 to Table D-32 identify the extent ofDNV GL involvement included in the three levels of verification involvement.

D.6.2.5 Recommended practice for integrity management of submarine pipeline systems is given in DNVGL-RP-F116.

D.6.3 Low level of verification involvement during operation

D.6.3.1 Low level verification involvement consists of general review of the main document(s) to checkcompliance with design documentation.

D.6.3.2 Audit during repair and modification.

D.6.4 Medium level of verification involvement during operation

D.6.4.1 Medium level verification involvement consists of detailed review of the main document(s) to checkcompliance with design documentation.

D.6.4.2 Audit attendance during commissioning, start-up of periodical survey, modification and repairactivities. For critical aspects, as identified by the requirement for maintenance of certificate, auditattendance throughout the activities. Review of contractors' documentation of any survey/modification.

D.6.4.3 Audit attendance during normal operation. Spot check of operational records and assessments.

D.6.5 High level of verification involvement during operation

D.6.5.1 High level verification involvement consists of detailed review of the main document(s) to checkcompliance with design documentation.

D.6.5.2 Audit attendance during commissioning, start-up of periodical survey, modification and repairactivities. For critical aspects, as identified by the requirement for maintenance of certificate, auditattendance throughout the activities. Review of contractors' documentation of any survey/modification.

D.6.5.3 Audit attendance during normal operation. Detailed review of operational records and assessments.

D.6.5.4 Review of the main document(s) to check compliance with applicable codes and standards. Auditattendance during start-up and performance of periodical survey, modification and repair activities. Forcritical aspects, as identified by the requirement for maintenance of certificate, full attendance throughoutthe preparations of and during the activities.


DNV GL AS

D.6.6 F 600 Scope of work for operation

D.6.6.1 Detailed scope of work for operation is given in Table D-27 to Table D-32 and is summarised in TableD-26.

Table D-26 Summary table - operation

Table No. Table description

D-27 Commissioning

D-28 Integrity management and quality systems

D-29 Risk assessment and IM planning

D-30 Inspection, monitoring, testing

D-31 Integrity assessment

D-32 Mitigation, intervention and repair

Table D-27 Commissioning


Low Medium High

Initial activities


2 Quality system audit/attend owner’s audit. - - A


4 Attend kick-off meeting/technical meeting/HAZOP meeting - X X


8 Filling of product/fluid - S1 S2

Base-line external survey (start-up inspection):



Base-line internal inspection (if applicable):

— Attend inspection, calibration of tool - - S19

— Review of inspection and assessment reports I R1 R2


Final activities

11 Issue of DNV GL visit report X X

12 Issue of DNV GL close out report X X X


DNV GL AS

Table D-28 Integrity management (IM) and quality system


Low Medium High

Identify and review of governance/management and planning

1 Design, fabrication and installation (DFI) document R1 R2 R2

2 Philosophy documents (operation, inspection, maintenance and repair/emergency philosophies) R1 R2 R2

3 Supporting philosophy documents (reporting and communication,management of change, organization and personnel) I R1 R2

4 Integrity management system (PIMS) and interfaces between activities I R1 R1

5 Main operating specifications and procedures R1 R2 R2

6 Audit of control room to review the day to day operation S1 S1 S2

Final activities

10 Issue of DNV GL visit report X X X

11 Input to annual assessment report X X X

Table D-29 Risk assessment and IM planning


Low Medium High

Risk assessment review

1 Attend risk assessment meeting/workshop - - X

2 Risk assessment reporting

— Risk assessment according approved specifications R1 R2 R2

— Documentation of that the risk assessment covers all items whichfailure may jeopardise the integrity of the pipeline system

I R1 R2

— For each item, documentation shall show that all threats have beenidentified and evaluated

I R1 R2

— Review that the risk assessments are properly documented and updated

as appropriate, e.g. findings from integrity assessment included(inspection, monitoring and testing)

I R1 R2

Review of integrity management planning

3 Integrity management plan

— Review of integrity management plan (inspection, monitoring and

testing) to confirm that the plans are updated to reflect the outcome ofthe risk assessments

R1 R2 R2

4 Inspection, monitoring and testing strategy R1 R2 R1

Final - reporting


DNV GL AS


Low Medium High


Table D-30 Inspection, monitoring and testing


Low Medium High

Review of inspection plans and reports (external and internal inspection)

1 Inspection plans

— Long term and short term inspection plans R1 R2 R2

— Document that the pipeline system has been inspected according toplans

I R1 R2

— Deviations from inspection plans shall be properly documented andapproved

I R1 R2

— Review that inspections are done and documented in accordance withapproved procedures

I R2 R1

2 Inspection procedures I I R2

3 Site visits - S1 S1

4 Inspection reports

— Review that the results from the inspections been evaluated by qualified

personnel— Implementation of findings

I R1 R2

Review of monitoring and test plans and procedures

5 Monitoring plans and procedures

— Documentation shall detail that the monitoring has been performedaccording to plans

R1 R1 R2

— Deviations from monitoring plans shall be properly documented andapproved

I R1 R2

— Review that monitoring are done and documented in accordance withapproved procedures

I R1 R2

— The results from the monitoring shall be evaluated by qualifiedpersonnel

I R1 R2

Review of testing (corrosion testing, function testing of valves, pig launcher/receiver etc.)

6 Test plans and procedures

— Testing performed according to plans shall be documented R1 R1 S1

— Deviations from test plans shall be properly documented and approved I R1 R2


DNV GL AS


Low Medium High

— Review that the testing has been done and documented in accordancewith approved procedures

I R1 R2

— Results from the testing shall be evaluated by qualified personnel I R1 R2

Reporting



Table D-31 Integrity assessment


Low Medium High

Review of integrity assessment

1 Integrity assessment report

— Integrity assessment performed according to approved procedures shallbe documented

R1 R1 R2

— Integrity assessment has been done and documented in accordancewith approved procedures

I R1 R2

— Results from the integrity assessment shall be evaluated by qualifiedpersonnel

I R1 R2

Reporting


Table D-32 Mitigation, intervention and repair


Low Medium High

Review of mitigation (pressure change, corrosion inhibitors, inspection frequencies)

1 Procedures according to approved specifications I R1 R2

2 Implementation of procedures I I R2

Review of intervention

3 Procedures according to approved specifications I R1 R2

4 As built documentation I R1 R2

Review of repair

5 Repair strategy I R2 R2

6 Design reports R1 R1 R2


DNV GL AS


Low Medium High

7 Procedures R1 R2 R2

8 Site attendance during execution - S1 S1

9 As built documentation R1 R2 R2

Reporting



Cha

nges

– h

isto

ric


DNV GL AS

CHANGES – HISTORICThere are currently no historical changes for this document.

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