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QUSAHWIRA FULL FIELD DEVELOPMENT PROJECTADCO PROJECT No. P-14364

ADCO CONTRACT NO.: 7278.01/EC 10737NPCC PROJECT No.: 9063

CRITICAL LINE PHILOSOPHY

ADCO DOCUMENT No.: 58.99.23.1602

I 12-Aug-10 Nitin PPSW AS Issued For IDCREV. DATE ORIGINATOR REVIEWED APPROVED DESCRIPTION

THIS DOCUMENT IS INTENDED FOR USE BY ADCO AND ITS NOMINATED CONSULTANTS, CONTRACTORS, MANUFACTURERS AND SUPPLIERS.

EPC CONTRACTOR: NATIONAL PETROLEUM CONSTRUCTION COMPANYP.O. BOX 2058, ABU DHABI, UNITED ARAB EMIRATES

____________________________________________________________________

ENGINEER: ENGINEERS INDIA LIMITED , NEW DELHI, INDIA

ADCO DOC. No.58.99.23.1602 CONTRACTOR DOC No.: A049-000-16-42-QP-1001 PAGE: 1 OF 8

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DOCUMENT TITLE: CRITICAL LINE PHILOSOPHYPROJ ECT No. :P 14364

ADCO DOC.No.: 58.99.23.1602

REV I DATE: 12-Aug-10

CONTRACTOR DOC. No. A049-000-16-42-QP-1001 PAGE: 2 OF 8

TABLE OF CONTENTS

1. PURPOSE & SCOPE.................................................................................................3

2. REFERENCES............................................................................................................32.1 Document Precedence........................................................................ 3

3. APPLICABLE CODES AND STANDARDS...............................................................3

3.1. Codes, Standards and Regulations...............................................................3

3.2. Definitions......................................................................................................4

3.3. Abbreviations.................................................................................................5

4. CRITICAL LINE SELECTION CRITERIA..................................................................5

4.1. Critical Line List.............................................................................................5

4.1.1 Criticality Codes...................................................................................

....64.2. Extent of Piping Analysis...............................................................................6

4.2.1. Category 1 pipe ..64.2.2. Category 2 pipe..7

4.2.3. Category 3 pipe..7

4.2.4. Category 4 pipe..7

5. PIPING CRITICALITY DIAGRAM............................................................................8

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DOCUMENT TITLE: CRITICAL LINE PHILOSOPHYPROJ ECT No. :P 14364

ADCO DOC.No.: 58.99.23.1602

REV I DATE: 12-Aug-10

CONTRACTOR DOC. No. A049-000-16-42-QP-1001 PAGE: 3 OF 8

1. PURPOSE & SCOPE:This specification outlines the procedure for identifying stress critical lines for the ADCO-QUSAHWIRA Full Field Development Project. They are issued for the guidance of StressEngineers performing stress analysis for the project.

This Procedure provides stress criticality criteria and guidelines to ensure that the piping

systems for the project are in accordance with the code requirements of ASME B31.3,Process Piping and DEPs.This Project Procedure covers minimum criteria for identification of the stress critical lines.

2. REFERENCES:

The following documents shall be refered.

31.38.01.11 -Gen Piping General Requirements (SHELL DEP) 31.38.01.29 -Gen Pipe Supports (SHELL DEP) 30.99.12.0023 Plant Layout and Piping Basis of Design (ADCO STD) 58.99.12.1602 Specification for Piping Flexibility Analysis (J OB SPEC) 58.99.91.2701 Piping Design Basis (J OB SPEC) 58.99.12.1601 Piping Material Class Specification (J OB SPEC)

2.1. Document Precedence:

In case of conflict, the order of precedence shall be:

Equipment data sheets DEPs and ADCO Standards Equipment Narrative Specifications FWP stds if applied Project Specifications & Standards3. APPLICABLE CODES AND STANDARDS:

3.1. Codes, Standards and Regulations:

All piping systems shall meet the requirements of this Procedure, other referenced ProjectSpecifications and the relevant of the following Codes, Standards and StatutoryRegulations (where applicable). The latest editions of the standards/code shall be referred.

API 560 Fired Heaters for General Refinery Services API 610 Centrifugal Pumps for General Refinery Service API 617 Axial & Centrifugal Compressors API 618 Reciprocating Compressors

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DOCUMENT TITLE: CRITICAL LINE PHILOSOPHYPROJ ECT No. :P 14364

ADCO DOC.No.: 58.99.23.1602

REV I DATE: 12-Aug-10

CONTRACTOR DOC. No. A049-000-16-42-QP-1001 PAGE: 4 OF 8

API 619 Rotary Type Positive Displacement Compressors API 650 Petroleum Storage Tanks API 661 Air-Cooled Heat Exchangers API 674 Positive Displacement Pumps - Reciprocating API 675 Positive Displacement Pumps Rotary ASME B31.3 Process Piping ASME B31.8 Gas Transmission and Distribution Systems ASME B73.1 & B73.2 Horizontal and Vertical Pumps (General Purpose) ASME Sect. III, Div 1 Rules for the Construction of Nuclear Facility Components,

Subsection NC-3658.3

ASME Sect. VIII Boiler and Pressure Vessel Code ASTM Material Testing / Certification BS 3974 PT I, II & III Specification for Pipe Supports NACE MR 0175 Sour Service Piping NEMA SM-23 Steam Turbines. NFPA 20 Installation of Stationary Fire Pumps for Fire Protection WRC Bulletin 107 Local Stresses in Spherical and Cylindrical Shells due to

External loading.

WRC Bulletin 297 Local Stresses in Cylindrical Shells due to External Loadingson Nozzles Supplement to WRC Bulletin 107

WRC Bulletin 449 Guidelines for the Design and Installation of Pump

3.2. Definitions:

The word shall indicate a mandatory requirement.

The word should indicate a recommended course of action.

The words may/can indicate one acceptable course of action.

The Client/Company shall mean Abu Dhabi Company for Onshore Oil

Operations (Referred as ADCO).

The Contractor/Purchasershall mean the party which carries out all or part of the

design, engineering, procurement, construction, commissioning and management of the

project during EPC phase.

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DOCUMENT TITLE: CRITICAL LINE PHILOSOPHYPROJ ECT No. :P 14364

ADCO DOC.No.: 58.99.23.1602

REV I DATE: 12-Aug-10

CONTRACTOR DOC. No. A049-000-16-42-QP-1001 PAGE: 5 OF 8

3.3. Abbreviations:

AIV Acoustic Induced Vibration

ANSI American National Standards Institute

ASCC Alkaline Stress Corrosion Cracking

ASME American Society of Mechanical Engineers

ASTM American Society for Testing And Materials

BEDD Basic Engineering Design Data

BOD Basis of Design

DEP Design Engineering Practices (Shell)

ESD Emergency Shut Down

FW Foster Wheeler Energy Limited

FWC FW Core Team

FWSP(R) FW Self Perform Reading

NPS Nominal Pipe Size

RPM Revolutions per Minute

SIF Stress Intensification Factor

SPS Special Pipe Support

TOS Top of Steel

4. CRITICAL LINE SELECTION CRITERIA:

4.1. Critical Line List:

The guidelines in this specification shall be used by the Lead Stress Engineer to create aCritical Line List based on the latest issued P&IDs, Design Conditions, Line Schedule.

The critical line list identifies lines from the piping line list which meet the criticalitycriteria outlined in section 4.2.

Lines identified from the stress categories within section 4.2 as being stress critical are tobe identified on the Critical Line List using the following nomenclature against each line asapplicable:

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DOCUMENT TITLE: CRITICAL LINE PHILOSOPHYPROJ ECT No. :P 14364

ADCO DOC.No.: 58.99.23.1602

REV I DATE: 12-Aug-10

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4.1.1. Criticality Codes:

Criticality codes to appear in the Critical Line List are to be specified as follows:

F = Fired Heaters

P = Pumps

TU =Turbines

K = Compressors

A = Air Fin Cooler

R =Reactor

C =Column

TK = Tankage

S = Safety / Relief Valves

O =Others

MSM = Multiselector Manifold4.2. Extent of Piping Analysis:

Lines that are carbon copies of previously analyzed lines(s) with the same boundaryconditions do not require re-analysis.

Lines to be defined as either category 1, 2, 3 or 4. Lines that are in categories 1, 2 and 3are to be listed in the critical line list, which shall define the category of piping of each line.Category 1, 2 and 3 are to be analyzed to the levels as defined below as a minimum orhigher if in the opinion of the stress engineer or checker where the system warrants ahigher category.

4.2.1. Category 1 Pipe:

Lines falling into this category are to be brought specifically to the attention of the LeadStress Engineer. The level of investigation will be established on an individual case basis.This review is to be carried out very early in the project and prior to any formal analysis forthe following conditions:

a) Large diameter pipes where the pipe diameter exceeds 36 (DN900).

b) Lines in category M fluid service (per ASME B31.3).

c) Lines in category 2 that, in the judgment of the analyst should have a criticality in

excess of those required for category 2.d) Lines in service below 46C.

e) Process lines connected to Compressors. (Top/Top nozzles).

f) Lines using vacuum stiffener rings.

g) Non-metallic piping.

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DOCUMENT TITLE: CRITICAL LINE PHILOSOPHYPROJ ECT No. :P 14364

ADCO DOC.No.: 58.99.23.1602

REV I DATE: 12-Aug-10

CONTRACTOR DOC. No. A049-000-16-42-QP-1001 PAGE: 7 OF 8

h) J acketed piping.

i) Pipe with wall thickness >10% or

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DOCUMENT TITLE: CRITICAL LINE PHILOSOPHYPROJ ECT No. :P 14364

ADCO DOC.No.: 58.99.23.1602

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5. PIPING CRITICALITY DIAGRAM: