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NORSOK STANDARD

WORKING ENVIRONMENT

S-002Rev. 3, November 1997

Please note that whilst every effort has been made to ensure the accuracy of the NORSOK standardsneither OLF nor TBL or any of their members will assume liability for any use thereof.

Working environment S-002Rev. 3, November 1997

NORSOK standard Page 1 of 50

CONTENTS

FOREWORD 3INTRODUCTION 3

1 SCOPE 4

2 NORMATIVE REFERENCES 4

3 DEFINITIONS AND ABBREVIATIONS 53.1 Definitions 53.2 Abbreviations 7

4 CONTROL AND VERIFICATION ACTIVITIES 74.1 General 74.2 Procedures and work instructions 84.3 Experience report 94.4 Concept working environment analysis 94.5 Organisation and manning study 94.6 Risk analysis 104.7 Psycho-social analysis 104.8 Working environment area limits 104.9 Working environment analyses 114.10 Constructability analysis 134.11 Working environment inspections 134.12 Working environment status 13

5 WORKING ENVIRONMENT REQUIREMENTS 145.1 Arrangements 145.2 Ergonomics 145.3 Technical appliances 165.4 Chemical substances and products 165.5 Noise and vibration 175.6 Illumination 205.7 Indoor climate 205.8 Outdoor operations 215.9 Radiation 21

ANNEX A WORKING ENVIRONMENT AREA LIMITS (NORMATIVE) 22

ANNEX B VERTICAL AND HORIZONTAL CLEARANCES AND DISTANCES(NORMATIVE) 24

ANNEX C DETAILED REQUIREMENTS RELATED TO INSTALLATION AREAS(NORMATIVE) 27

ANNEX D TYPICAL HAZARDOUS SUBSTANCES (NORMATIVE) 28

ANNEX E VIBRATION LIMIT CURVES (NORMATIVE) 31

ANNEX F WORKING ENVIRONMENT AREA CHART (NORMATIVE) 33

ANNEX G LIST OF APPLICABLE ACTS, REGULATIONS, STANDARDS ANDGUIDELINES FOR THE NORWEGIAN CONTINENTAL SHELF (INFORMATIVE) 35



ANNEX H NOISE DATA SHEET (INFORMATIVE) 36

ANNEX I EXAMPLES OF METHODS FOR ANALYSIS OF THE WORKINGENVIRONMENT (INFORMATIVE) 38

ANNEX J PROCEDURE FOR NOISE CONTROL (INFORMATIVE) 41



FOREWORD

NORSOK (The competitive standing of the Norwegian offshore sector) is the industry initiative toadd value, reduce cost and lead-time and remove unnecessary activities in offshore fielddevelopments and operations.

The NORSOK standards are developed by the Norwegian petroleum industry as a part of theNORSOK initiative and are jointly issued by OLF (The Norwegian Oil Industry Association) andTBL (Federation of Norwegian Engineering Industries). NORSOK standards are administered byNTS (Norwegian Technology Standards Institution).

The purpose of this industry standard is to replace the individual oil company specifications for usein existing and future petroleum industry developments, subject to the individual company's reviewand application.

The NORSOK standards make extensive references to international standards. Where relevant, thecontents of this standard will be used to provide input to the international standardisation process.Subject to implementation into international standards, this NORSOK standard will be withdrawn.

Annexes A, B, C, D, E, F are normative. Annexes G, H, I and J are informative.

INTRODUCTION

This standard applies to the design of new installations and modification or upgrading of existinginstallations for offshore drilling, production, utilisation and pipeline transportation of petroleum,including accommodation units for such activities.

Revision 3 includes the following changes:

• Implementation of the parts of the guidelines to the Norwegian “Regulations relating tosystematic follow up of the working environment in the petroleum activities” that affectdesign. Guidelines to the design of the living quarters and doors and stairs are found inNORSOK standards for the architectural discipline.

• Updating of the standard in view of new regulations and European standards.• Implementation of experiences from Revision 2 in project work.



1 SCOPE

This NORSOK standard addresses design principles related to the working environment. It alsocovers requirements to the procedures for control and verification of design in order to ensure thatthese principles are implemented.

The purpose of this standard is to ensure that the design of the installation promotes the quality ofthe working environment during the operational phase.

2 NORMATIVE REFERENCES

The following standards include provisions that, through reference in this text, constitute provisionsof this NORSOK standard. Latest issue of the references shall be used unless otherwise agreed.Other recognised standards may be used provided it can be shown that they meet or exceed therequirements of the standards referenced below.

EN 292 Safety of machinery - Basic concepts, general principles for design, Part1 and 2.

EN 294 Safety of machinery - Safety distances to prevent danger zones to bereached by upper limbs.

EN 349 Safety of machinery - Minimum gaps to avoid crushing of parts of thehuman body.

EN 547 Safety of machinery - Human body dimensions.part 1 Principles for determining the dimensions required for openings for

whole body access into machinery.part 2 Principles for determining the dimensions required for access openings.part 3 Anthropometric data.EN 563 Safety of machinery - Temperature of touchable surfaces - Ergonomics

data to establish temperature limit values for hot surfaces.EN 614 Safety of machinery - Ergonomic design principles.part 1 Terminology and general principles.EN 626 Safety of machinery - Reduction of risks to health from hazardous

substances emitted by machinery.prEN 1005 Safety of machinery - Human physical performance.part 2 Manual handling of objects associated to machinery.part 3 Recommended force limits for machinery operations.EN 1050 Safety of machinery - Risk assessment.prEN 12437 Safety of machinery - Permanent means of access to machines and

industrial plantspart 1 Choice of a fixed means of access between two levelspart 2 Working platforms and gangwayspart 3 Stairways, stepladders and guard trailspart 4 Fixed laddersDIN VDE 0848, Part 4 Safety at electro magnetic fields.



ISO 717/1 Acoustic rating of sound insulation in buildings and of buildingelements.

ISO 5349 Guidelines for the measurement and the assessment of human exposureto hand-transmitted vibration.

ISO 2631/1 Evaluation of human exposure to whole body vibration- Part 1: Generalrequirements.

NORSOK C-001 Living quarters area.NORSOK C-002 Architectural components and equipment.NS 4815 Determination of occupational noise exposure.NS 8172 Measurement of noise levels from technical installations.

See Annex G for a list of acts, regulations, standards and guidelines for the Norwegian continentalshelf.

3 DEFINITIONS AND ABBREVIATIONS

3.1 DefinitionsCan Can-requirements are conditional and indicate a possibility open to the

user of the standard.

Enclosed work area Area that is fully protected against exposure to open air and ambientconditions.

Hazard A source of possible injury or damage to health.

Informative references Shall mean informative in the application of NORSOK standards.

Manning Three levels of manning of work areas and work places are defined:

Permanently manned; Work area or work place manned at least 8 hoursa day for at least 50 per cent of the installation’s operation time.

Intermittently manned; Work area or work place where inspection,maintenance or other work is planned to last at least two hours a day forat least 50 per cent of the installation’s operation time.

Normally not manned; Work area or work place that is not permanentlyor intermittently manned.

May May indicates a course of action that is permissible within the limits ofthe standard (a permission).

Normative references Shall mean normative in the application of NORSOK standards.

Open work area Area with no substantial obstacles to the free. The area is completelyexposed to ambient conditions.



Semi-open work area Area that is weather protected e.g. with weather louvers, and partiallyexposed to the open air.

Shall Shall is an absolute requirement which shall be followed strictly inorder to conform to the standard.

Should Should is a recommendation. Alternative solutions having the samefunctionality and quality are acceptable.

Work area A work area is an area of the installation, where personnel stay or movein connection with work.

Work place A work place is a volume within a work area, allocated to one or morepersons to complete work tasks related to production, inspection ormaintenance.

Working environment The totality of all physical, chemical, biological and psychologicalfactors at work that may affect the employees’ health and well beingthrough acute trauma or lasting exposure. The influences from lastingexposure may be positive and negative.

Working EnvironmentAnalysis A systematic work process including:

Definition, limitation and break down of the installation with respect toone or more parameters (e.g. area, activities during operation, type ofequipment, chemical substance).

Hazard identification..

Estimation of potential consequences to the employees’ health and, iffeasible, of probability of occurrence.

Evaluation of needs of remedial actions.

Development of recommendations on remedial actions and/or follow-upactivities.

Identification of nonconformities and problems in meeting specifiedrequirements

Working EnvironmentProgram A document covering:

Working environment objective and goals and acceptance criteria forthe risk of occupational injuries and possible work-related illnessesduring operation.



References to working environment requirements.

References to applicable procedures for control and verification.

Responsibilities for implementation of working environmentrequirements in design and for control and verification activities,including means of ensuring that the employees and their electedrepresentatives are given an opportunity of participating in matters ofimportance to the working environment.

Plans for control and verification activities, deliverables included.

Status concerning performed activities.

The Working environment program may be a separate document orintegrated into a Health, safety and environment program.

3.2 AbbreviationsBOP Blow-Out Preventer.CRIOP Crisis Intervention in Offshore ProductionHVAC Heating, Ventilation and Air Conditioning.LQ Living Quarters.TLV Threshold Limit Value.WCI Wind Chill Index

4 CONTROL AND VERIFICATION ACTIVITIES

4.1 GeneralThis standard assumes that a Working environment program is established and maintained.

Table 1 lists the studies and analyses to be performed and documented for new installations in orderto control and verify that the design principles in clause 5 are met. For modifications or upgradingof existing installations, new analyses shall be performed or existing analyses shall be updated forthe working environment factors that are affected by the modification. Responsibility and schedulefor the different control and verification activities shall be defined in the Working environmentprogram considering needs of timely input to design and procurement and needs of documentation.



Table 1 Overview of studies and analyses.

TYPE PURPOSE PERFORMED BYExperience report To ensure experience transfer related to the

working environment from installations inoperation.

Company

Concept workingenvironment analysis

To identify and evaluate potential problemareas as input to concept selection andverification of design.

To be specified inworking environmentprogram

Organisation andmanning study

To provide input to the establishment ofworking environment area requirements and toworking environment studies and analyses.

Company

Risk analysis To verify compliance with company acceptancecriteria for the risk of occupational injuries andto identify the necessary assumptions forconcept selection and optimisation and fordetail engineering.

To be specified inworking environmentProgram

Psycho-social analysis To analyse design and planned organisationand manning in order to make an overallevaluation of the working environment and toidentify potential problem areas related to thepsycho-social working environment inparticular.

Company

Working environmentarea limits

To establish and implement area limits forillumination, temperature, concentration ofchemical substances in the workingatmosphere, ventilation and noise


Working environmentanalyses

To identify and evaluate potential problemareas for different working environment factorsas input to concept definition and optimisationand design development.


Constructabilityanalysis

To ensure that the design promotes asatisfactory health, safety and environmentstandard during construction.


Working environmentinspections

To verify that the fabricated mechanicalpackages, modules and structures meet theworking environment requirements.


Working environmentstatus

To provide an updated overview of the statuson the different working environment factors.


4.2 Procedures and work instructionsProcedures and work instructions for the defined studies and analyses according to clause 4.1 shallbe developed and maintained. In general, they shall cover the following:

• Aim and scope.



• Definitions.• Responsibilities for initiation, execution and follow-up of the results.• Descriptions of:

− Types of input to the analysis.− Organisation of the analysis, requirements to qualified personnel and employee participation.− Types of work to be done.− Scheduling in relation to the progress of the project.− Methods for estimations, calculations and measurements with reference to relevant national

and international standards.− Priorities for selection of safety measures. EN 292-1, clause 4 is referred to.− Documentation and follow up of the results.

• References. The procedures and work instructions shall ensure that the requirements according to clauses 4.3 to4.12 are implemented in the execution of the analyses and final conclusions.

4.3 Experience report Sources of experience may include: • earlier modifications to improve the working environment• good technical solutions and solutions/equipment to be avoided• statistics on occupational accidents, near accidents and possible work-related diseases• results of working environment mapping and surveys

4.4 Concept working environment analysisThe concept working environment analysis shall provide input to concept selection and verificationof the selected concept including cost estimates.

The analysis shall cover but not be limited to the following potential problem areas:

• Risks of severe accidents and muscle-skeletal injuries in heavy material handling.• Risks of severe accidents and muscle-skeletal injuries in handling of drilling equipment (if

relevant).• Exposure to wind chill in naturally ventilated areas.• Storage and handling of hazardous substances.• Storage of bulky materials, e.g. scaffolding.• Noise and vibration emitting equipment and areas with noisy activities adjacent to quite areas.• Solitary work in permanently manned work areas.

4.5 Organisation and manning study The study should specify the following for the different positions in the installation’s organisation: • tasks / responsibilities• distribution of working hours by area



4.6 Risk analysisThe methods for risk analysis shall be adapted to the applicable acceptance criteria for the risk ofoccupational injuries, ref. Working environment program. Normally, the risk of accidents should beanalysed:

• for all personnel on the installation,• for especially exposed groups of personnel,• for critical activities with risk potential of severe consequences.

For requirements to specific types of risk analyses, see clause 4.9.

4.7 Psycho-social analysisThe conditions for a safe, efficient and health-promoting interaction between the employee and theenvironment shall be determined by applying a systematic method. This should include anevaluation of job demands and provisions for social interaction and self-determination in thedifferent positions on the installation. The analysis should also consider the provisions for copingwith the work situation offered by the various leisure activities during the time off at theinstallation.

4.8 Working environment area limits

4.8.1 GeneralDetailed specifications of area limits for each room/work area that is readily accessible shall beestablished as input to engineering. Annex A shows applicable area limits for illuminance,temperature, noise and vibration for typical areas of an installation. In addition, the uniformity of theilluminance (Emin / Emean) shall be specified. In establishing noise area limits above 85dB(A), theindividual employee’s exposure time in noisy areas shall be considered. For concentrations ofchemical substances in the working atmosphere, area limits shall be established when there is apossibility of exceeding 10% of the threshold limit value according to clause 5.4.3. For Norway,establishment of area limits for the number of air changes per hour shall be based on therecommended calculation method in Directorate of Labour Inspection, order no. 516. The arealimits shall be documented on Working environment area charts as shown in Annex F.

Adequate calculations shall be performed in order to ensure implementation of the arearequirements in design and data sheets for vendor packages. These calculations shall be documentedon the Working environment area charts where relevant.

The quality of the illumination in the central control room should be evaluated in a special study.

The implementation of the requirements shall be verified by appropriate measurement methods anddocumented in the Working environment area charts.

4.8.2 Noise and vibration controlDuring concept definition and optimisation, it shall be ensured that:

• Major noise and vibration sources are localised.• Possible use of low noise equipment is evaluated.



• A review of the localisation of noisy equipment and areas in relation to silent areas is performed.• The use of “buffer” zones is evaluated.

During engineering, it shall be ensured that:

• Significant noise and vibration sources are identified and their influences evaluated.• Sound absorption treatment for all enclosed areas, sound insulation and vibration isolation for

equipment and machinery are specified.• Maximum noise and vibration levels for significant noise and vibration sources are specified on

the basis of area noise and vibration limits and the acoustic properties and the adequate soundinsulation between areas. A safety margin of 3dB should be applied in the calculations. Additiveeffects of several sources in the same area shall be taken into account. Noise data sheets for allpotential noisy equipment shall be prepared and included in the inquiries, see Annex H. Vendorsshall be requested to propose noise reduction measures, if equipment does not meet therequirements. All noise data shall be guaranteed. Procedures for testing and control of theguaranteed levels shall be required in the contract.

• Requirements to acoustic pipe insulation are specified.• Noise and vibration levels are predicted and documented for the different areas of the installation

at a stage of the project where all requirements have been stated. The individual noise exposureshall be calculated for typical categories of employees working in areas with a noise level above83dB(A). No use of ear protection shall be assumed for the calculations.

• In areas where whole body vibration limits may be exceeded, structural vibration analysis areperformed.

• Noise and vibration predictions are updated, based on vendor guaranteed noise and vibration dataand the detail design of the installation.

During fabrication, it shall be ensured that all “noisy” non-standard equipment are tested accordingto a defined test procedure during the Fabrication acceptance test. For standard equipment, datafrom earlier tests may be accepted. All important tests shall be executed or witnessed by a qualifiednoise control engineer.

It shall be ensured that, where feasible, a full noise mapping of the different areas of installation isdone during commissioning.

A recommended procedure for noise control is presented in Annex J.

4.9 Working environment analyses

4.9.1 GeneralThe types of analyses to be performed are presented here. It is not required to repeat earlierperformed analyses or to evaluate design in cases where this represents a standard and previouslyaccepted solution, provided that design and manning are unchanged. In these cases, earlier analysesor existing standard solutions and accompanying documentation shall be referred to. Wherepracticable, different analyses should be combined. Examples of methods for working environmentanalyses are presented in Annex I.



4.9.2 Coarse job safety analysisThis analysis shall be carried out for each work area on the installation. Operation/drilling,repair/maintenance, material handling and waste handling/house keeping activities and walkingshall be covered at a coarse level. Risks of severe injury or fatality due to moving parts ofmachinery, trapping/entanglement, falling to a lower level, sliding/stumbling/hitting against, ejectedmaterials, fire/explosions, hazardous substances shall be identified and evaluated. Causes andpotential consequences shall be identified and decisions on follow-up actions shall be made foridentified hazards.

4.9.3 Detailed job safety analysisThis analysis shall be carried out for critical work places, which involve tasks with a high risk ofaccidents. Each task shall be broken down into steps and analysed by a method similar to that forcoarse job safety analysis. Also less severe accident risks shall be covered. Criteria for the selectionof work places for the analyses include:

• Frequently repeated manual tasks, especially in material handling.• Manual tasks in the risk zone of mechanised equipment.• Manual tasks involving hazards with potentially severe consequences.

For safety analyses of machines, EN 1050 is referred to.

4.9.4 Ergonomic job analysisThis analysis shall be performed for all workplaces, which involve tasks in operation ormaintenance with a significant risk of muscle-skeletal injuries. The aim is to identify potentialproblem areas in design of workplaces in order to ensure that the requirements to maximumworkload are possible to meet. Input concerning manning, work sequences, frequency of operation,inspection and maintenance tasks, necessary equipment for performance of the tasks, personnelselection and earlier experience in similar tasks should be ensured prior to the analyses. Theanalyses shall include but not be limited to evaluations of layout, clearances for performance oftasks, location of work functions (displays, control actuators, manually operated valves etc.), needsof stairs and access platforms, and lifting and transportation aids.

4.9.5 Man-machine interface analysisThis analysis shall include a job/task analysis and shall be performed for control room and controlcabin tasks, where human errors may cause accidents with severe consequences to personnel,environment or property. The evaluations shall cover normal operation including start-up andshutdown, emergency operations and maintenance/revision. The analyses shall cover personnel andsystem safety aspects, including the possibility to control process disturbances in a safe manner. TheCRIOP-method, see Annex I, is referred to for complex and critical control rooms.

4.9.6 Analysis of the handling of hazardous substances/chemicalsAll chemical substances that are planned for use during operation and maintenance and mayrepresent a health hazard shall be identified. Typical chemicals to be evaluated are processchemicals, drilling mud, paint, diesel, lube oil and crude oil. The activities where there is a risk ofexposure to the chemicals during transportation, storage, use and disposal shall be identified and theneeds of control measures to eliminate or reduce exposure shall be evaluated. Needs for safetyshowers or eye baths shall be evaluated.



4.9.7 Outdoor operations analysisThis analysis shall be carried out for work places in open and semi-open areas, considering theduration of stay and assuming normal work clothing. The aim is to identify and remedy potentialproblem areas related to the wind chill and hypothermia. During engineering, it shall be ensuredthat:

• Workplaces in open and semi-open areas, where there is frequent work with a duration of 10minutes or more are identified.

• Primarily, the design and localisation of equipment representing such workplaces is reviewed inorder to limit exposure to wind and rainfall. Secondly, the need for shelter to protect the workersis evaluated.

• The Wind chill index (WCI) is calculated and documented for the identified workplaces. Whencalculating the WCI, verified meteorological data for the past five years or more should be used.

• The acceptability of the exposure to high WCI’s is determined, considering the work load andduration of stay in exposed areas, and assuming normal work clothing.

4.10 Constructability analysisIt shall be ensured that the design of the contract object promotes a satisfactory health, safety andenvironment standard during construction. The following shall be considered in particular:

• Accessibility (with respect to installation, lifting, cutting, welding, shot blasting and surfacetreatment) including selection of steel details and profiles.

• Selection of materials and chemicals.

Relevant experience related to health, safety and environmental pollution during construction shallbe collected, compiled and used.

4.11 Working environment inspectionsWorking environment inspections shall be carried out during Construction and MechanicalCompletion in order to verify that the physical installation meets the established requirements.Special checklists shall be prepared for this purpose.

4.12 Working environment statusWorking environment area charts according to Annex F or equivalent shall be applied indocumenting the working environment status. In principle, a Working environment area chart shallbe prepared for each room and area on the installation. To maintain a manageable number of Areacharts, several identical areas can be covered only by one typical chart, i.e. office, cabin, toilet/WCand escape/transport route.

The Working environment area charts shall be kept updated with the results of predictions, andmeasurements and problem areas and nonconformities identified in analyses and the status ofdecisions on remedial actions.



5 WORKING ENVIRONMENT REQUIREMENTS

5.1 Arrangements

5.1.1 GeneralSafe distances according to EN 349 shall apply between moving machinery parts and fixed objects.

Provisions shall be made for safe and efficient transportation of materials, both horizontally andvertically. Storage areas and lay down areas belonging to them should be located in the vicinity ofeach other and on the same level.

Offices, coffee bars and recreation rooms should preferably have access to daylight.

Workplaces shall be arranged to provide for contact with others. Solitary work shall be avoided inpermanently and intermittently manned areas.

5.1.2 Means of accessAll work areas shall have a layout that provides for safe access for operation and maintenance.Floors in work areas and walkways shall be designed in accordance with the following:

• Walkways for access to permanently and intermittently manned work places shall be arranged.These shall be shown on relevant drawings.

• Drips of oil and slippery liquid onto floor shall be avoided, e.g. by using drip trays.• Protruding objects shall be avoided in walkways, access ways and transportation ways.• Need for anti skid surfaces shall be evaluated in all work areas where spill of slippery liquid,

dusts etc. may occur.

Stairs are preferred to ladders. Ladders may replace stairs where stairs are unfeasible or where dailyaccess is not required. Stairs, ladders and platforms shall be designed in accordance with Annex Band recognised standards listed therein.

At the top of ladders, self-closing gates shall be arranged. Such gates shall not open towards theladder.

Fixed stepladders shall be provided with handrail on both sides.

Access openings in vertical partitions into cofferdams, tanks etc. shall be equipped with hand gripson both sides above the opening.

5.2 Ergonomics

5.2.1 Prevention of muscle-skeletal injuriesWorkplaces shall be designed such that the personnel is not exposed to excessive work loads withrisks of muscle-skeletal injury. For determination of maximum work load and force limits, prEN1005, part 2 and 3 are referred to. The requirements above entail that efforts should be made toavoid:



• monotonous muscular load• excessive muscular load• work in fixed or static position• work with joints in extreme position• work requiring high precision and which at the same time requires substantial use of force• work in kneeling, squatting and lying positions• work of long duration and of repetitive nature with hand above shoulders or below knees• continuous asymmetric load on the body

5.2.1.1 Manual handling, transportation• Transportation ways where trolleys and carts are used shall not contain steps and thresholds.• The need for a lift for vertical transportation shall be evaluated.• There shall be enough space for the use of lifting and transportation gear where lifting or

transportation of more than 25 kg is required.• Trolleys, transportation tables and similar means of transportation should be easily manoeuvrable

and have a low rolling resistance. Minimum two of the wheels shall be lockable.• Units in everyday use shall not be stored above shoulder height (1500 mm) and should not be

stored below 900 mm.

5.2.1.2 Hatches and doors• Vertical inspection hatches should be side hinged.• The opening force of doors in frequent use shall not exceed 65N (side hinged) and 50N (sliding

door) respectively. No doors shall have an opening force in excess of 130N (side hinged) and105N (sliding door). Mechanically assisted opening of doors shall be considered in the mainwalkways. Hinged doors leading to open areas shall be provided with a damping mechanism toprevent crushing injuries.

5.2.1.3 Adaption for cleaning• A ring main for high-pressure wash down stations shall be considered in areas where heavy

cleaning will take place.• Drains shall be located so as to facilitate cleaning. Materials and surfaces of structural members,

installations and equipment shall be easy to clean and maintain.• Maintenance and/or cleaning equipment and ditto consumables should be stored in the vicinity of

areas with frequent maintenance or cleaning.• Equipment and fixtures should be mounted on plinths or fixed to walls so as to give maximum

free floor space for easy cleaning.

There shall be dedicated space for the necessary cleaning equipment adjacent to rooms requiringcleaning by hand such as offices, coffee bars and toilets. The space shall be equipped with cold andhot water, utility sink with grid (height 600 mm above floor) and sufficient vertical distance to thetap for filling buckets. There shall be sufficient floor space to park a cleaning trolley.

For vertical and horizontal clearances, Annex B is referred to.

5.2.2 Man-machine interfacesFor control rooms and cabins and control panels where human errors may cause accidents withsevere consequences to personnel, the environment or property, the following shall apply:



• Displays and controls shall be designed in accordance with acknowledged ergonomic principlesand in order to allow the operator to carry out his tasks in a safe manner. The number of andtypes of displays should however be minimised.

• Screens, panels and lighting fixtures shall have a location, which provides satisfactory view in anormal working posture. It shall be easy to adjust the height and angle of computer screens andkeyboards as well as their distance to the operator.

• If visual displays (VDUs) are used, information should not be presented in a way which gives theoperator memory problems or adds to his load of work. Total system overviews should beavailable from the displays, giving the operator opportunities to watch process performance.

The design shall be based on task analyses of functions, see clause 4.9.

Controls and displays shall be located in a logical manner with respect to frequency of use andimportance for safe operation and the movement of a control device should be consistent with theeffect in direction and magnitude. They shall be clearly marked in the language of the country.

In Norway, Directorate of Labour Inspection, order no. 528 is referred to.

5.3 Technical appliances

5.3.1 GeneralMachinery shall be designed in accordance with the methods and technical principles according toEN 292-1 and EN 292-2. Relevant type B European Norms shall be identified and implemented.

5.3.2 Hot/cold surfacesIt shall not be possible to reach surfaces with a temperature above +70°C or below -10°C from workareas, walkways, ladders, stairs or other passageways, ref. EN 563.

Shields are preferred to insulation, unless insulation also is required for heat conservation or noisecontrol.

5.4 Chemical substances and products

5.4.1 Handling and storageManual handling of hazardous substances should be avoided. The use of automatic or remotelycontrolled equipment is preferred. Where this is not feasible, systems for safe manual handling shallbe provided.

The installation shall be designed such that all spillage is properly handled. The need for drain andtheir effectiveness shall be evaluated for all work areas.

There shall be a dedicated storage area for each type of chemical. These areas shall not be used forother purposes. The areas shall be properly ventilated and protected against fire. Chemicals that mayreact with each other shall not be stored together.



5.4.2 List of hazardous chemicalsThe design shall ensure that the exposure to chemical substances and products containing hazardoussubstances is minimised. Residual risks shall be brought up in the instructions for use. Typicalexamples of chemical products are process and drilling chemicals, paint, lube oil and preservationchemicals. Hazardous substances according to Annex D1 are prohibited. Substances classified ascarcinogenic, allergenic, mutagenic or reproductive toxicants shall be identified and evaluated forsubstitution with less hazardous substances. A list of typical such chemicals is shown in Annex D.2.For classification of chemicals, the national legislation is referred to.

All chemicals that follow the installation offshore or are included in instructions for operation andmaintenance shall be documented on Safety data sheets. In Norway, the Safety data sheets shall bein the Norwegian language and approved through the Norwegian Oil Industry Association’s qualityassurance system for material safety data sheets.

5.4.3 Threshold Limit Values (TLV)Emissions of hazardous substances from machines shall be controlled, ref. EN 626.

Extraction systems should efficiently pick up the pollutants near the source.

Under normal operation, the concentration of hazardous substances in the working atmosphere shallbe as low as reasonably possible. The installation shall be designed such that, under normalconditions, the atmospheric concentrations of hazardous substances in permanently manned workareas do not exceed 1/6 of the TLV’s according to the regulatory requirements in the country. Forother areas, an area limit of 1/3 of the TLV applies. For Norway, the TLV’s specified in Guidelinesfrom the Directorate of Labour Inspection (order no. 361) shall apply.

5.5 Noise and vibration

5.5.1 GeneralInstallation of low noise equipment shall be the primary noise control measure. For piping systems,selection of low noise valves and other components with low noise properties shall be givenpriority.

Noisy equipment and equipment with high structure borne sound emission levels and areas withnoisy activities (e.g. lay down areas, work shops) shall not be located in the immediate vicinity ofareas with a noise level limit of 50dB(A) or below (e.g. offices, clinic, central control room,sleeping/recreation areas).

No noise sources that may significantly reduce the speech intelligibility shall be installed in theimmediate vicinity of lifeboat stations and muster points. This also applies to the location of safetyrelief valves.

There shall only be needs of shorter stay for inspection purposes in unmanned machinery roomsduring running of machinery. This should be accomplished through location of noisy machines inseparate rooms. There shall be no regular access ways through unmanned machinery rooms to otherworkplaces.



5.5.2 Area noise limitsThe following noise level limits reflect the requirements for conservation of hearing:

• The individual employee’s maximum exposure to noise during a 12 hours working day is83dB(A).

• The maximum allowable noise level in any situation is 130dB(C) (“PEAK”). This limit alsoapplies to enclosed “normally unmanned areas”.

Annex A covers vibration limits and area noise level limits, total and for HVAC.

The area noise level limits shall apply as maximum levels at any location within an area, but notcloser than 1m to equipment and other noisy installations.

All limits refer to broad band noise without any distinct tonal characteristics. In case of tonalcharacteristics, the noise level limit shall be set 5dB lower.

For areas, where the area noise level limit according to Annex A is 85dB(A) or 90dB(A), the limitof 90dB(A) shall apply only where a lower limit is unfeasible. If an area limit of 90dB(A) isincompatible with the individual employee’s maximum noise exposure, measures in design toreduce the needs of stay in the noise zone shall be evaluated.

In workshops and kitchen, the noise limits refer to background noise including ventilation systemand external noise sources, but not manually controlled operations. For these operations, themaximum noise exposure for 12 hours working day applies.

In control rooms, offices, computer rooms, radio rooms and laboratories the noise level limits referto background noise including HVAC as well as noise sources in continuous use within the actualroom.

During design emergency conditions, e.g. near safety relief valves, fire pumps or outdoor areasduring full emergency flaring, etc., only the maximum allowable noise level of 130dB(C) applies.

The noise level in the muster areas shall not exceed 90dB(A) and the noise level in the radio room,the emergency management room and the central control room shall not exceed 60dB(A) duringemergency flaring.

Access to control rooms, offices, laboratories etc. from noisy areas should be via corridors or bufferzones in which the noise level do not exceed the quiet room noise level by more than 5dB. Accessfrom walkways to permanently manned areas should be provided without passing a zone with noiselevel above 83dB(A).

When selecting the design of enclosed spaces, i.e. when decisions on acoustic treatment shall betaken, the requirements to PA system and speech intelligibility shall be taken into account. Lowreverberation times shall be adhered to.

For work shops, laboratories, control rooms, radio room, meeting rooms, coffee bars/TV rooms,dining room and offices, the average octave band sound absorption coefficient shall not be less than0.4 in the frequency range 250Hz to 2kHz.



The partitions between rooms shall be designed in order to achieve an adequate sound insulation.Minimum permissible air borne sound insulation indices for horizontal, vertical and diagonal soundtransmission between adjacent rooms are shown in table 2. Acoustic rating of sound insulation shallbe according to ISO 717/1.

Table 2 Minimum permissible field measured weighted sound reduction index ( R’w )between rooms in the living quarters.

Noisy rooms Work rooms Silent rooms Corridors/staircasesNoisy rooms 40dB1) 40dB 45dB2) 35dBWork rooms 40dB 40dB 35dBSilent rooms 40dB 40dBNotes1. Does not apply to partition between kitchen and dining room.2. Common partition with clinic/ward shall be avoided.3. The maximum unfavourable deviation from the reference curve should not exceed 8dB.

Examples of “Noisy rooms” are gymnasium, TV-rooms/cinema, kitchen, dining, and change rooms.“Work rooms” are offices, meeting rooms, radio room, and control rooms. “Silent rooms” require ahigh degree of privacy and include cabins, clinic/ward, and reading rooms.

5.5.3 VibrationsAnnex E shows the maximum limits for continuous whole body vibration from machinery andequipment that shall apply. Vibration limits are based on boundaries given in ISO 2631/1Evaluation of human exposure to whole body vibration- Part 1: General requirements. The limitsare derived from the acceptability of the exposure of human beings to vibrations and are based on a12-hour working day.

The vibration limits are specified graphically as combined levels for vertical and horizontalmovements. The limits cover the range 1-80Hz in which the major body resonance occur. They arenot intended to be extrapolated beyond this range.

The vibration limits are categorised as follows:

Category 1 Limits for accommodation areas.Category 2 Limits for control rooms, offices and laboratories.Category 3 Limits for all general work areas.Category 4 Limits for vibration locally to equipment.Category 5 Maximum limits (normally unmanned areas).

Higher levels than those given in category 4 may be tolerated for shorter exposure than 12 hours.Category 1, 2 and 5 shall also apply for intermittent operation.

Hand/arm vibrations shall meet the requirements stated in ISO 5349.



5.6 IlluminationFor the general level of illuminance at 1m of elevation, the area requirements according to Annex Aapply. The uniformity of the illuminance shall be equal to or better than Emin/Emean = 0.5 in process,utility and drilling areas.

For lighting calculations a maintenance factor, reflecting the environment and time betweenmaintenance intervals, shall be established and applied. Maintenance factor 0.8 is recommended.

Lighting shall be specified for each work place that requires at least daily access or is critical from asafety point of view. For Norway, the guidelines in “Luxtabeller” from the Norwegian society forgood lighting shall be applied in the specification of task lighting.

To avoid shadows, illumination planning shall take the location of fixtures, racks and mechanicalequipment into consideration.

The difference in illuminance level between adjacent indoor areas should not exceed 5:1.

In enclosed areas, the difference shall never be more than 40:1 within the total field of vision.

Provision shall be made to avoid direct glare from sunshine, from artificial light sources and fromreflecting surfaces.

Glare in visual display units from reflecting surfaces, lamps and windows shall be avoided.

In the design of the lighting, the level of illumination and location of lamps shall make it easy to seeobstructions, steps in corridors, walkways etc.

Different levels of illuminance require different light colours if the lighting is to be comfortable.Warm colours should be used in cabins and recreation areas where the lighting levels are below500lux. High colour temperature, whiter light, should be used in areas with high lighting levels.

5.7 Indoor climatePermanently manned work areas shall be enclosed and meet the climate requirements for such areas.Annex A is referred to and, for Norway, Directorate of Labour Inspection, order no. 516.

Air inlets shall be located in open air and in areas not contaminated by exhaust outlets.

There shall be easy access for internal inspection and cleaning of ducts.

Printers, copy machines etc. to be used by more than one person should not be placed inpermanently manned rooms unless mounted in special cabinets.

Supply air ducts in the living quarters and in permanently manned areas outside the living quartersshall after mechanical completion be cleaned to achieve a dust coverage in accordance with Table 3.



Table 3 Cleaning classes for supply air ducts.

Cleaning class Norm Maximum Applies toA: High 3% 5% Cabins, clinic/ward, sensitive instrument roomsB: Normal 5% 7% Permanently and intermittently manned areas in

LQ, offices and coffee bars outside LQ,laboratories, permanently manned control roomsand control cabins

C. Low 7% 10% Workshops

Air extract ducts shall be cleaned to cleaning Class C.

Materials containing synthetic mineral fibres, which are used in the living quarters or inpermanently manned areas, shall be fully sealed.

5.8 Outdoor operationsThe percent of time that the individual employee is exposed to a WCI above 1000 W/m2 shall bereduced as far as reasonably practicable for workplaces, where there is frequent work with durationof 10 minutes or more.

For evaluations of the acceptability of a WCI above 1000 W/m2, the following operationalrestrictions should be assumed to prevent harmful effects of wind chill on unprotected skin:

• WCI > 1600 W/m2: No outdoor work to be performed.• 1600 W/m2 > WCI > 1500 W/m2: The available working time per hour and person increases

from 0% to 33% linearly.• 1500 W/m2 > WCI > 1000 W/m2: The available working time per hour and person increases

from 33% to 100% linearly.

On installations that are planned for use in areas with arctic climate, outdoor operations shall beidentified and reduced to a minimum.

5.9 RadiationThe location of high voltage equipment (>690V) adjacent to permanently manned work areas andaccommodation areas should be avoided.

Electromagnetic field shall conform to the limits stated in the DIN VDE 0848, Part 4 - Safety atelectro magnetic fields.

For protection against radiation from radioactive sources, the national legislation is referred to. Theuse of radioactive sources on an installation shall be minimised. A separate list of all radioactivesources on the installation shall be prepared. This list shall give information on location, type ofequipment and radioactive source, radiation levels and required protection.

The radioactive sources shall be adequately marked at the location.

The design shall ensure that radioactive sources can be safely transported, handled, applied andstored.



ANNEX A WORKING ENVIRONMENT AREA LIMITS (NORMATIVE)

Table A.1 Working environment area limits

Room description Level ofmanning1)

Averageilluminancelevel (lux)

Temp.Min- Max

oC

Vibrationlimit

Noisetotal

dB(A)

NoiseHVACdB(A)

External walkways andaccess ways

100 outdoor 80

Stairs, walkways andaccess ways in enclosedareas

150 -

Lay down area 200 75Muster area U 200 outdoor 2 75Fire pump room U 200 5-35 3 110 80General process and utilityarea

I 200 outdoor /5 - 35

3 85/903)

HVAC room U 200 5-35 3 90Switchboard andtransformer room

I 200 5-35 2 85 70

Central control room M 500Adjustable

20-24 1 506) 45

Coffee bars outside LQ M 150 19-26 2 606) 50Battery room U 200 5-35 3 85 70Main generator room U 200 5-35 3 85/903) 70Emergency generatorroom

U 200 5-35 3 110

Local control room I 400 19-26 2 60 50Inst/El. workshop M 500 19-26 2 652) 6) 50Mechanical workshop/welding

M 500 16-26 2 652) 6) 50

Stores - Large parts 200 16-26 2 656) 60Stores - Small parts 300 16-26 2 656) 60Laboratory I/M 500 19-26 2 60 50Paint shop I 500 16-26 2 656) 55Sand blast room I 300 16-26 2 652) 6) 55Workshop office M 500 19-26 2 55 50Crane cabin M 400 19-26 2 657) 60

Driller’s cabin M 400Adjustable

19-26 2 65 60

Unmanned machineryroom

U 200 5-35 3 110 80

Local instrument room U 400 5-35 2 75 60Coffee barsin LQ,TV room etc.

I 150 20-24 1 45 40

Dining room M 300 20-24 1 55 50Laundry- machinery area M 300 20-24 2 75 60- work area M 300 20-24 2 65 60



Room description Level ofmanning1)

Averageilluminancelevel (lux)

Temp.Min- Max

oC

Vibrationlimit

Noisetotal

dB(A)

NoiseHVACdB(A)

Kitchen M 500 20-24 1 602) 55Dish washing M 500 20-24 1 70 55Gymnasium I 500 20-24 1 50 45Cabins M 150 20-244) 1 406) 35Clinic/ward M 600 20-24 1 406) 35Offices/meeting rooms M 500 20-24 1 456) 40Radio room M 500 20-24 1 50 45Toilets/change room I 150 20-24 1/25) 60 50Drill floor M 350 outdoor 3 85Monkey board M 200 outdoor 3 85Pipe rack area I 200 outdoor 3 85Mud/well logging I 500 16-26 2 60 50Shale shaker I 300 outdoor 3 85/903)

Mud room, mixing area I 200 outdoor 3 85/903)

Mud room, test station I 300 outdoor 3 85/903)

Mud lab I 300 16-26 2 60 55BOP and well head areas I 150 outdoor 3 85/903)

Notes:1. M = Permanently manned

I = Intermittently mannedU = Normally unmanned

2. The noise limit refers to background noise including ventilation system and external noise sources, butnot manually controlled operations. For these operations, the maximum noise exposure for 12 hoursworking day applies.

3. 85dB(A) is preferred in order to ensure that the individual employee’s maximum exposure to noiseduring a 12 hours working day is 83dB(A). A maximum area noise level limit of 90dB(A) shall apply,where the lower limit is unfeasible.

4. The control system shall allow for free cooling in cabins to 16°C. This shall not be a thermo dynamicdesign requirement.

5. Category 2 applies outside LQ.6. For mobile offshore installations, the noise requirement during operations is 5dB(A) higher than the one

given in table.7. For crane cabins, the requirement refers to the equivalent sound level to which the crane driver is

exposed during a time period defined by a typical crane cyclus (in Norway cf. definition given in NS4815).



ANNEX B VERTICAL AND HORIZONTAL CLEARANCES AND DISTANCES (NORMATIVE)

Table B.1 Vertical and horizontal clearances and distances

Topic Vertical Horizontal CommentsMINIMUM CLEARANCES IN ACCESS WAYS AND WORK AREASMain walkways 2100 mm

(2300 mm isrecommended)

1000 mm

Access ways 2100 mm(2050 mm in dooropenings and aboveeach step in a fixedstepladder)

600 mm Min. width 900 mm for accessto permanently andintermittently mannedworkplaces

Hatch openings 800 x 800 mm Min. 600 x 600 mm applies foraccess to cofferdams and tanksfrom floor / platform

Transportation ways fortrolleys / trucks

2100 mm(2300 mm isrecommended)

Trolley width + 300mm /Truck width + 900mm

Work areas 2300 mm Down to min 2100 mmacceptable in parts of workareas

At work position for access tofixed equipment duringoperation / maintenance

700 mm

Between pipe bottom and floor 150 mm Does not apply to drain pipesBetween external diameter offlange and fixed obstruction

250 mm 250 mm Applies to flanges withdiameter above 100 mm. Pipes,tubes and fittings shall beaccessible for maintenancewith necessary space for tools.

Space between fixed cabinetsand floor

min. 250 mm Preferably fixed on floorwithout space

ARRANGEMENT OF WORK AREASTable top, seated work 680-750 mm

Thickness max. 50mm

Easily adjustable from workposition in permanently andintermittently mannedworkplaces

Clearances for legs belowwork surface, seated work

Width min. 610 mmDepth min. 500/650mm at kneelevel/floor level

Table top, standing work 800-1050 mm Easily adjustable from workposition in permanently andintermittently mannedworkplaces



Topic Vertical Horizontal CommentsThe centre height of controldevices above floor level(including valve handles)

max. 1800 mm Does not apply to controls ininfrequent use (< once pr.month)900 - 1500 mm for controls indaily use and for controlswhere access in an emergencyis required.

Visual displays above floorlevel, standing work

1100 - 2000 mm For displays in daily use andfor displays where reading inan emergency is required.Location of critical displays tobe based on task analysis, ref.clause 4.9.5.

Electrical contacts andswitches above floor

900-1500 mm

Sink, heights above floor 600 mmFLOOR, DECK SURFACES, PLATFORMSMaximum unprotectedopenings

100 x 100 mm Larger openings shall becovered or secured by guardrailor similar. Hatches withcoaming height below 750 mmto be equipped with railing.

Maximum opening in grating Ø 20 mm Note 3. Grating shall not allowa ball with greater diameter tofall through. Applies aboveplaces with presence ofpersons, otherwise Ø 35 mm.

Maximum unsecured heightdrop to lower level

800 mm Also applies to stairs. Higherdrops to be secured by guard-rails, railings or bulkwalk

Maximum height difference inone step between floor / decklevels in access ways

350 mm

GUARDRAILSHeight from floor to top ofrailing

min 1000 mm Also applies for distancebetween stair railing and step.

Free space between handrail –knee rail - toe plate

max 380 mm Min two knee rails for guard-rails above floor.

Height toe plate min 100 mmmax 15 mm openingbetween toe plateand floor

Handrail - diameter 25 - 50 mmLADDERS, STEPLADDERS1)

Inclinations Note 2Min. / max. width betweenuprights

400 mm / 600 mm

Spacing between rungs 250 - 300 mm Rungs evenly spaced and soconstructed that theyeffectively prevent the footfrom slipping sideways.



Topic Vertical Horizontal CommentsMaximum allowable height ofcontinuous ladders

10000 mm Note 3. Rest landing minimumat each 6000 mm for laddersabove 10000 mm.

Clearance between the ladderand fixed parts of thesurrounding:in front of the ladderbehind the front of rungs

650 mm200 mm (150 mmfor discontinuousobstacles)

Safety cage for ladders higherthan

3000 mm

Safety cages:start at a height above floor /deckterminates at a height aboveupper level

2200 - 3000 mm

min. 1100 mm

Hand grips to extend min. 1100mm above upper level.

Diameter of safety cage 700 - 800 mmSTAIRS Note 2. See also NORSOK Standard C-002

Notes:

1. Reference: prEN 12437-4

2. Inclinations

Ramps: 0 - 10°Range to be avoided: 11°°°° - 20°°°°Stairways: 21° - 45° Recommended 30° - 38°Fixed stepladder: 46° - 75° Recommended 46° - 60°; preferred to fixed ladderFixed ladder: 76° - 90°

3. For Norway, requirements in NPD Guidelines on means of access, stairs, ladders etc. are referred towhen active.



ANNEX C DETAILED REQUIREMENTS RELATED TO INSTALLATIONAREAS (NORMATIVE)

C.1 Living QuartersNORSOK standard C-001 is referred to for requirements to living quarters.

C.2 Drilling Unit• There shall be anti-skid flooring in work and transportation areas.• There shall be sufficient storage space near the work area for auxiliary equipment that is used

temporarily.• The heavy equipment storeroom shall have a location that makes transportation/lifting onto/from

the drill floor easy.• Arrangements shall be made to avoid unnecessary traffic on the drill floor.• There shall be suitable conditions for appropriate handling of heavy logging instruments.• The driller shall from a normal working position have an unrestricted view of the risk zone of the

equipment that he controls.• Windows towards the rotary, top drive and finger board shall have an effective cleaning system

which ensures satisfactory visibility in all kinds of situations. It shall be possible to maintain thecleaning system in a simple and safe manner.

• The design of the derrickman’s cabin shall meet the requirements to crane driver’s cabin, seeclause C3, points 1 to 5.

• The adding and mixing of powder to drilling mud shall be enclosed to reduce the danger ofchemical exposure. Adding and mixing operations that involve manual lifting/carrying should beavoided. The chemical sack room and the mud mixing room should be situated on the same floorand in the immediate vicinity of each other.

• It shall be possible to put pallets of sacks on the lifting table near a possible sack cuttingmachine, using a truck or pallet lift.

• A separate mud laboratory with office facilities shall be provided.

C.3 Crane Driver’s Cabin• The crane driver’s cabin shall be designed so that the crane driver, when sitting in a normal

position, has an unrestricted view of all loading positions.• The crane driver’s chair shall be placed on rails so as to ensure ease of movement both backward

and forward. The chair shall be easily accessible for both entering and leaving.• The crane driver’s chair shall meet the general requirements for chairs, have good individual

adjustment qualities and shall be designed to provide good resting comfort. The support providedby the armrests shall be suitably adapted to the operator and the control levers.

• Control levers attached to the crane driver’s chair shall follow the chair’s movements. Othercontrols shall be placed within the recommended working areas for hands and feet.

• Conditions shall be suitable for easy and safe cleaning of windows both externally and internally,as well as cleaning and replacement of windshield wipers.

• It shall be possible to use telephones and other communication equipment in a loudspeakingmode.

• There should be a chair or seat for the instructor for use during on the job training.• The cabin shall be provided with adjustable lighting or with direct instrument lighting and a

reading lamp.



ANNEX D TYPICAL HAZARDOUS SUBSTANCES (NORMATIVE)

D.1 Hazardous Substances that are prohibited

Table D.1 Hazardous substances that are prohibited

Compound Formula CAS no. Reference2-naftylamine and their salts 91-59-8 SAM4-aminobiphenyl and theirsalts

92-67-1 SAM

Benzidin and their salts 92-87-5 SAM4-nitrodiphenyl 92-93-3 SAMAsbestos 1332-21-4 Regulations relating to asbestosCadmium compounds Par-com-ICarbontetrachloride CCl4 56-23-5 Montr.prot, Tx,K3CFC type chemicals Montr.prot, SFTHalon Montr.prot, SFTMercury compounds Par-com IPCB Par-com I , SFTAtapulgitt SAMAlpha-sepiolite SAMTrichloromethane(chloroform)

CHCl3 67-66-3 SFT

1,1,2-trichloroethane 79-00-5 SFT1,1,2,2-tetrachloroethane 79-34-5 SFT1,1,1,2-tetrachloroethane 630-20-6 SFTPentachloroethane 76-01-7 SFT1,1-dichloroethylene 75-35-4 SFT1,1,1-Trichloroethane 71-55-6 Montr.prot, SFT



D.2 Hazardous Substances that shall be evaluated for substitution with less hazardous substances

Table D.2 Hazardous substances that shall be evaluated for substitution with less hazardous substances

Compound Formula CAS no. ReferenceArsenic compounds Par-com - IIBenzene C6H6 71-43-2 K2Bitumene 8052-42-4 K3Chromates (VI) K3,A,REthyleneglycol monoethyl ether(2-Etoxyethanol)

110-80-5 R

Ethyleneglycol monoethyl ether acetate(2-Etoxyethylacetate)

111-15-9 R

Ethyleneglycol monomethyl ether ( 2- Metoxyethanol) 109-86-4 REthyleneglycol monomethylether acetate( 2-Metoxyethylacetate)

110-49-6 R

Formaldehyde HCHO 50-00-0 A,K3,Tn-Hexane C6H14 110-54-3 RIsocyanates SAM, ALead compounds Par-com II,

SAMMethanedichloride CH2Cl2 75-09-2 K3Nickel Compounds ATrichloroethylene 79-01-6 K3



D.3 ReferencesParCom Paris Commission, Guidelines regarding harmonisation of procedures of

approval , evaluation and testing of offshore chemicals and drilling mud.Annex F part I

ParCom II Annex F part II

Montr.prot Montreal Protocol on substances that deplete the Ozone layer. Withamendments 1990.

SFT Regulations from Norwegian State Pollution Control Authority (SFT)

SAM Norwegian Petroleum Directorate’s Regulations relating to systematicfollow-up of the working environment in the petroleum activities(Systematisk oppfølging av arbeidsmiljøet i petroleumvirksomheten)

K,A,R,Tx,T Cancerogenic (K), Allergic (A), Reproduction toxic (R), Very toxic (Tx)or Toxic (T) according to Regulations concerning labelling, sale etc. ofchemical substances and products which may involve a hazard to health.



ANNEX E VIBRATION LIMIT CURVES (NORMATIVE)



ANNEX F WORKING ENVIRONMENT AREA CHART (NORMATIVE)

WORKING ENVIRONMENT AREA CHART Doc.no. Rev. Date Page

Installation: Room/area name: Module/level: Area no.: Manning:1)

WORKING ENVIRONMENT AREA LIMITS

Factor Limit/level2) Preliminaryprediction3)

Predicted atissue forconstruction3)

As built4) Status5) /Notes6)

Noise: TotalHVAC

Vibration

Illumination

Temperature

Air changes pr.hourTypes ofhazardoussubstances7) :GENERAL

Factor Document id.no.8)

Description of identifiedhazards/nonconformities/comments

Decision Status5) /Notes6)

Arrangements

Ergonomics

Technical appliances

Chemical substances

Outdoor operations

Radiation

Notes6):

PREPARED BY9) : CHECKED BY9): APPROVED BY9):



Notes:1. Level of manning, see Annex A: Permanently manned (M); Intermittently manned (I); Normally

unmanned (U).2. To be established according to clause 4.8.1.3. Preliminary prediction and prediction at issue for construction shall be made for noise, see clause

4.8.2. The needs of two separate predictions shall be evaluated for other factors.4. Measured values during commissioning.5. Status: OK; Action required (AR); Nonconformity, action pending (NCP); Nonconformity,

approved (NCA); Not identified (NI); Not applicable (NA)6. State references to underlying documentation, e.g. nonconformity reports7. List all identified chemicals, that are planned for use and that may represent a health hazard, ref.

clause 4.9.8. State document identification number for performed working environment analyses and design

reviews.9. May be replaced by signatures on common front sheet.



ANNEX G LIST OF APPLICABLE ACTS, REGULATIONS, STANDARDSAND GUIDELINES FOR THE NORWEGIAN CONTINENTALSHELF (INFORMATIVE)

G.1 Acts and RegulationsActs, regulations and provisions for the petroleum activity, Vol. 1 and 2. Norwegian PetroleumDirectorate, Stavanger. See especially:

• Act relating to worker protection and working environment.• Regulations relating to systematic follow-up of the working environment in the petroleum

activities (Systematisk oppfølging av arbeidsmiljøet i petroleumvirksomheten).• Regulations relating to labelling, sale etc. of chemical substances and products that may involve

a hazard to health.• Regulations relating to asbestos.• Safety data sheets for chemical substances and products. Directorate of Labour Inspection, Order

no. 452 (EU Council Directive for Safety Data Sheets).• Machines (Maskiner). Directorate of Labour Inspection, Order no. 522 (EU Council Directives

for Machinery Safety).• Work at visual display terminals (Arbeid ved dataskjerm). Directorate of Labour Inspection,

Order no. 528 (EU Council Directive on the minimum safety and health requirements for workwith display screen equipment).

• Heavy and repetitive work (Tungt og ensformig arbeid). Directorate of Labour Inspection, Orderno. 531 (EU Council Directive on the minimum health and safety requirements for the manualhandling of loads where there is a risk particularly of back injury to workers).

Several other Norwegian regulations include requirements of relevance to the working environment.

G.2 Standards and Guidelines• Administrative norms for pollution in the working atmosphere (in Norwegian). Directorate of

Labour Inspection, Order no. 361.• Climate and air quality in the work place. Directorate of Labour Inspection, Order no. 516.• Lux tables (Luxtabeller), Norwegian Society for Good Lighting.



ANNEX H NOISE DATA SHEET (INFORMATIVE)

SDS-050 Noise data sheet enclosed

NORSOK NOISE SDS-050S-002 DATA SHEET Rev. 3, Nov. 1997

Page 1 of 1

Package no. Doc. no. Rev.

Tag no. Location/moduleUnit No. req'd

Service Inquiry No.Size & type Quote No. Supplier P.o. No. Manufacturer Job No. Model Serial No.

1 EQUIPMENT DESIGN DATA2 Calculated ∆ L=SWL - SPL dB (Note 1)3 Efficiency %4 Equipment size (l x w x h) m Driver type5 Power kW Driver speed rpm6 Capacity Equipment speed rpm7 Pressure disch. Gear tooth contact rate Hz8 Pressure suction Blades/vanes pass frequency9 Equipment weight kg Number of stator/number of rotor blade ratio1011 COMPANY SPECIFIED DATA Octave band centre frequency, Hz12 Noise Level Limits (Note 1) dBA 31.5 63 125 250 500 1000 2000 4000 80001314151617 Special requirement:1819 20 Noise test required: Yes O No O Optional O2122 SUPPLIER DATA Octave band centre frequency, Hz23 Guaranteed Noise Levels (Note 1) dBA 31.5 63 125 250 500 1000 2000 4000 80002425262728 Narrow band component, Yes O No O Frequency/octave band: Hz29 Method for Noise Level Test:3031 Description of implemented noise control measures / other information3233 34 35 AS BUILT NOISE DATA Octave band centre frequency, Hz36 Measured noise levels (Note 1) dBA 31.5 63 125 250 500 1000 2000 4000 80003738394041 Special information424344 Note 1 SPL Sound pressure level in dB (re. 20 µ Pa) at 1 m distance free field conditions.45 SWL Sound power level in dB (re. 1 pW).46



ANNEX I EXAMPLES OF METHODS FOR ANALYSIS OF THE WORKING ENVIRONMENT (INFORMATIVE)

I.1 Working Environment Risk Analyses

I.1.1 Job Safety AnalysisThe aim of a job safety analysis (JSA) is to identify and evaluate the hazards, to which employeesare exposed when performing work activities. Coarse and detailed JSA differ in the level of detail,by which the activities are broken down. A JSA is carried out in a JSA team, consisting of projectpersonnel and representatives of the user group. It follows a stepwise procedure:

1. Delimit the analysis to work activities within an area, in connection with a machine etc.2. Identify the activities of the area/machine. In detailed JSA, each activity is described, step by

step.3. Identify relevant hazards for each activity / sub-activity.4. Estimate the expected frequency and consequences of accidents due to exposure to the identified

hazards.5. Evaluate needs of remedial actions.

Steps 2, 3 and 4 of the analysis are supported by checklists. The results are documented in a table,showing activity, hazards, causes, expected frequency and consequences and actions.

Reference: Harms-Ringdahl, L.: Risk Analysis - Principles and Practices in Occupational Safety.Elsevier, London, 1993.

I.1.2 Chemical Handling AnalysisThe Chemical handling analysis is a variation of the JSA, which focuses on risks of exposure tochemical substances. It involves the following steps:

1. Identify hazardous chemicals that are planned for use during operation (incl. drilling) andmaintenance of the installation.

2. For each chemical, list all activities associated with it from when the chemical is brought to theinstallation and until it is disposed of. Include handling/transportation, storage and use.

3. For each activity, identify risks of employees being exposed to the chemical through inhalation,digestion or skin contact.

4. Estimate the frequency and extent of exposure and evaluate the risk of developing anoccupational accident or disease considering the toxicity of the chemical.

5. Evaluate needs of remedial actions

I.1.3 Comparison Risk AnalysisComparison risk analysis results in an assessment of the expected increase/decrease in the accidentfrequency rate of the new installation, as compared to the historical accident frequency rate ofexisting “reference” installations. It involves the establishment of a database on accidents from thereference installations. This is manipulated in order to establish a simulated database of expectedaccidents on the new installation. The analysis is performed in four steps:



1. Selection of reference platforms and establishment of reference database.2. Analysis of the accidents in the database by activity and hazard for each area of the installations.3. Assessments of changes in exposure to hazards and probability of accidents for the new

installation in relation to the reference installations, considering design, manning and operationsprogram of the new and the reference installations. This part of the analysis is documented in atable for each area of the platform. It shows the historical accident frequencies for the referenceinstallations, the expected accident frequencies for the new installation, and the detailedassessments that have been made.

4. Calculation of accident frequency rates for different areas and occupations on the newinstallation and for the installation as a whole.

Reference: Kjellén, U.: Integrating analyses of the risk of occupational accidents into the designprocess - Part II: Method for prediction of the LTI-rate. Safety Science, Vol. 19, p. 3-18, 1995.

I.2 Psycho-Social AnalysisDemand-resource analysis (DRA) is a systematic method for evaluation of the different aspects ofthe working environment of a position on the installation. It focuses on the interactions between theemployee in this position and the environment concerning:

• job demands,• social interaction,• self determination, and• provisions for coping through leisure activities.

A panel of operators and managers representing this position on an existing installation and projectpersonnel and working environment experts perform the DRA. They scrutinise design and plannedorganisation and manning by examining the interactions between the employees in the position andthe environment. The eight first areas cover physical factors and the last five psycho-social factorsof the working environment. A profile showing the extent of positive and negative stresses for eacharea along with comments is compiled.

I.3 Ergonomic Analysis

I.3.1 Task AnalysisIn a task analysis, units of work are identified and described in order to analyse the resourcesnecessary for successful work performance. Both the requirements to the employees’ capabilities(skills, knowledge, etc.) and to the working environment (controls, displays, procedures, etc.) areconsidered.

There are many variations of task analysis. A simple method adapted for industrial use, lists thesequence of tasks by purpose, action, needed information input, and problems related to controls,displays and working posture. Results are used in order to identify the requirements for a gooddesign as input to the redesign of the workplace.



Reference: EN 614, Safety of machinery - Ergonomic design principles. Part 1: Terminology andgeneral principles.Salvendy, G. (Ed.): Handbook of Human Factors. Whiley, 1986.

I.3.2 CRIOPThe objective of a CRIOP-analysis is to evaluate the design, manning and procedures of a controlcentre in relation to its expected ability to handle disturbances that, if not properly handled, maycause major accidents. A CRIOP analysis consists of two steps:

1. Review of the static characteristics of the control centre by use of a checklist.2. Scenario analysis, including task analysis.

The static review includes arrangements, man-machine interfaces, physical working environment,control- and safety systems, work organisation, procedures and training program.

In the scenario analysis, STEP-diagrams of potential accident scenarios are established. A STEP-diagram shows the different “actors” (humans, objects) along the y-axis. Time is shown on the x-axis. Actions are displayed in the diagram by actor and point in time. In the next step, criticalactions are identified, where human errors may have sever consequences. For each critical action,design, manning and procedures are evaluated by considering the operators possibilities to detectand diagnose hazards and to take proper actions.

Reference: Ingstad, O. and Bostad, L.: CRIOP - A scenario-method for evaluation of the offshorecontrol centre. SINTEF Report STF75 A89028, Trondheim, 1990.

I.3.3 Valves and Instrument Access and Operability ReviewThe aim of a valves and instrument access and operability review is to verify, that the operators’access during their daily inspection rounds is safe and efficient. The review is carried out in a team,consisting of project personnel and representatives of the user group. It follows a stepwiseprocedure:

1. Identify the route through the process and utility areas that the operator takes during the dailyinspection tour.

2. Identify on a P&ID the valves, instruments, etc. that are accessed during this tour.3. Review the walkway and the access to the identified tag numbers in relation to the requirements

to safe and easy access. This may be done on the basis of arrangement drawing or three-dimensional CAD.



ANNEX J PROCEDURE FOR NOISE CONTROL (INFORMATIVE)

J.1 ScopeThis document describes the procedure for noise control of offshore installations and equipment. Itdescribes the activities and studies, reports and documentation which shall be covered during designand fabrication of an installation in order to ensure that the requirements given in NORSOK S-002are implemented in the execution of the evaluations, analyses and final design.

The procedure defines the Contractor’s responsibility for acoustics, noise and vibration control andits documentation during the concept, engineering, fabrication, commissioning and early productionphases. The same responsibilities apply to the Contractor’s sub-contractors.

J.2 AimThe aim of this document is to establish a satisfactory noise control engineering working practice inorder to limit the noise level and attain satisfactory sound insulation and acoustic conditionsthroughout all parts of the designed installation (accommodation, utility, drilling and productionareas). A good acoustic environment and controlled noise levels:

• reduce risk of permanent hearing damage to an acceptable level and prevent accident risks andother health hazards,

• ensure that warning signals and emergency messages are clearly audible,• allow adequate speech, telephone and radio communication and audible oral perception,• make possible a reasonable level of conversational privacy,• maintain working efficiency and proficiency of personnel performing designated tasks and• provide an acceptable sleeping and recreational environment in accommodation area (living

quarters). The work philosophy shall be to obtain a satisfactory working environment with regard toAcoustics, Noise and Vibration at the lowest possible cost - without reducing the quality and theaccessibility or increase the maintenance and the production costs. This shall be attained through: • Involvement of noise control engineers and co-operation with process, electrical, instrument,

piping, layout and mechanical (drilling) disciplines throughout the project.• Involvement of experienced personnel from existing installations.• Acceptance of noise control as an integral part of the design - also on process optimisation - from

the first stage of the project.

J.3 Requirements NORSOK S-002, Working Environment In Norway, the following acts and regulations apply: • Act relating to worker protection and working environment.• Regulations relating to systematic follow-up of the working environment in the petroleum

activities (Systematisk oppfølging av arbeidsmiljøet i petroleumvirksomheten).



Other references: CONCAWE report 87/59 The prediction of noise radiated from pipe systems - an engineeringprocedure for plant design

J.4 Organisation and Responsibilities The engineering team should be equipped with at least one experienced noise control engineer,working with noise control as their main activity. The noise control engineer is responsible for noisecontrol activities as defined by the noise control flow chart, Figure J.1. This includes establishmentof specific noise control requirements, noise evaluations and calculations and documentation ofresults. Table J.1 gives a summary of the different noise control related activities which the variousdisciplines in an engineering team are responsible for. This should be used as a check-list forensuring that the necessary activities are included in the scope of work during the different phases ofthe design.

Table J.1 Responsibilities and activities within an engineering project team Discipline Responsibilities Architectural Implement requirements for acoustic absorption in area design.

In collaboration with Noise control specialist, identify areas with specificrequirements for airborne noise insulation. Implement floating floors, visco-elastic floor systems, vibration-reducingcassettes, etc. where deemed necessary by the noise control evaluations. Ensure that requisitions for doors/windows/internal and external wall systems,etc. include necessary acoustic requirements.

Electrical Ensure that requisitions for all noise emitting equipment include necessaryrequirements for noise and vibration control.

HVAC Consider noise control aspects when designing the ventilation system, e.g. airvelocity, pressure drops, location of system elements. Specify required extent of primary and secondary sound attenuators in theventilation system and include attenuation requirements in the equipmentrequisition. Ensure that requisitions for all noise emitting equipment include necessaryrequirements for noise and vibration control

Instrument Ensure that requisition for control valves includes noise limit and a requirementfor calculating noise levels from the valves. Ensure that requisition for orifice plates includes a requirement for calculation ofgenerated noise.

Mechanical Ensure that requisitions for all noise emitting equipment include necessaryrequirements for noise and vibration control. Evaluate requirements for noise control treatment. Ensure noise testing requirements are implemented in the package specification.



Discipline Responsibilities Piping/Layout Ensure layout has considered location of noisy sources with relation to noise-

sensitive areas, both on a horizontal level and vertically. Ensure layout has considered implementation of corridors/buffer zones betweennoisy and noise-sensitive areas. Ensure that there is enough space for implementation of noise control measures(where required) around equipment.

Process Ensure that noise control aspects are considered during line sizing and processdesign. Include requirements for acoustic insulation of piping on the P & ID’s.

Safety Ensure that requisitions for any noise emitting equipment include necessaryacoustic requirements. Ensure that working environment area charts include requirements to total areanoise levels and HVAC noise levels

Structural Ensure that structural design of supports and deck areas under main itemsrotating and reciprocating equipment, takes into account required stiffness toavoid vibration problems

Telecommunication

Evaluate the conditions and intelligibility of the public address (PA) system.

J.5 Work Procedure and Instructions This section gives a stepwise procedure for the execution, management and documentation ofacoustics, noise and vibration control during the different phases of a project. Project phasedesignations are indicative. The steps shall not necessarily be taken in the described order. Formodification projects, the procedure as given herein may be simplified dependent on the type ofproject. The applicable parts shall be considered. The principal activities of the procedure are also shown by the FLOW CHART presented in FigureJ.1.



Figure J.1

NOISE CONTROL FLOW CHART

Identify main sources Define area limits

Specify maximum noise levels for equipment as input to package specifications

Review bid info./data and participate in bid clarification meetings

Calculate area noise levels

Evaluate possible control measures

Area control measures (e.g. layout, acoustic absorption,

pipe insulation)

Equipment control measures (e.g. alternative equipment, enclosures,

lagging etc.)

Recalculate area noise levels

Consider further control measures

Follow-up of equipment and platform design

Witness of supplier noise test

Perform area noise surveys

Include modifications

Acceptance and installation of equipment

Identify remedial

actions

Coarse noise evaluation report

Noise prediction report

Platform area noise survey report

Review area layout and initiate any necessary

changes

Evaluate planned manning and possible personnel

exposure levels



J.5.1 Concept evaluations

Step 1 During concept selection and optimisation, the following principal noise and vibration controlsubjects shall be evaluated; • the localisation of major noise and vibration emitting equipment and areas with noise generating

activities with regard to quiet areas such as living quarters, offices, laboratories and controlrooms.

• the use of low noise equipment.• acoustic modifications at source.• identification of any items of equipment which should be isolated due to high noise levels and

proximity to other items which will require regular maintenance.• layout and arrangement changes, local or general (use of buffer zones).• acoustic insulation and vibration isolation.• valve and pipe noise control philosophy. Decisions taken at this stage may have a major influence on the total cost of the installation as wellas acoustics, noise and vibration control measures. The acoustical evaluation shall therefore be an integral part of all relevant evaluations by alldisciplines. The analyses of noise emissions and energy consumption should be co-ordinated. The main items of mechanical equipment which must be evaluated as early as possible include, as aminimum: • gas compressors (motor and turbine driven)• main generators (turbine driven)• diesel engines (for emergency generators, firewater pumps, pedestal cranes, etc.)• large pump sets (e.g. oil export, water injection, methanol injection)• air compressors• drilling equipment (e.g. shale shakers, mud pumps, drawworks, top drive)

J.5.2 Engineering Evaluations

Step 2

Define preliminary noise level limits for each area/room on the installation, based on NORSOK S-002, Appendix A. Identify noise sources and evaluate principal acoustic and noise control solutions.

Ensure input from operations concerning plan for manning levels on the platform and exposureperiods for different categories of personnel on the installation and the areas in which they mayspend time. Based on this evaluation and using the first specification of area noise levels, derivepreliminary predictions of personnel noise exposure levels and revise the area limits or relocateequipment if necessary.

Noise and vibration sources that may contribute to the overall area noise level, shall be identifiedand their characteristics predicted. Principal acoustics, noise and vibration control solutions shall be



evaluated. Co-operation by all relevant disciplines is required, including layout, architectural,mechanical (drilling), electrical, instrument, piping, structure, HVAC, and safety.

Reports/Documentation : Specific area noise level limits for total and HVAC noise. (May alsobe input to “Working Environment Area Limits” report).

Step 3

Calculate maximum noise level limits for equipment and machinery. Give requirements for soundabsorption treatment, sound insulation solutions and vibration isolation. (Normal and “extreme”conditions should be evaluated where possible). Possible relocation of equipment should beevaluated if necessary.

The following procedure should be adopted when specifying maximum permissible noise emissionfrom equipment:

1. Establish area noise level limits (see Step 2).2. Calculate the acoustic properties of enclosed spaces.3. Determine the total "permissible" sound power emission into the area (From 1. & 2.).4. Distribute the permissible sound power emission between the items in the area, including pipe

and structure borne noise, on the basis of their size, duty, operation cycle, typical (empirical)noise emission and the available noise control hardware.

5. Make allowance for additive effects of direct sound from adjacent sources. (A noise predictionmodel should be established).

6. Decide on the adequate form of specification (whether limits for sound pressure level, soundpower level or both shall be stated).

Reports/Documentation : Coarse Noise Evaluation Report

Step 4

All inquiries for proposals for noisy or potentially noisy equipment shall be accompanied by: a) aSpecial Technical Specification which covers the requirements to vendor information and tests, andb) a Noise Data Sheet on which the maximum noise level limits acceptable to the Company shall bespecified (several disciplines involved).

The Special Technical Specification is normally a part of a Master Package Specification whereasthe Noise Data Sheet is usually included in the package specification/inquiry documentation.

Due to the uncertainties present in all noise measurements and calculation procedures, it is practicalto design to noise levels 3 dB below the relevant area limits. This approach will also compensate forproblems with increased noise in time. Such a safety margin, however, shall always be consideredwith respect to cost and technical basis.

The noise and vibration data and noise and vibration control measures stated in the Coarse NoiseEvaluation Report, shall be the basis for decisions and for a closer investigation in areas wherenoise level limits may be exceeded.



The requirements to sound insulation, sound absorption and vibration isolation shall be specifiedand implemented in the design, both for equipment and structures.

Reports/Documentation : Noise data sheets

Step 5

Review bid information and noise data and ensure that the noise control engineer participates in bidclarification meetings for potentially noisy equipment.

A duly completed Noise Data Sheet shall be returned from each of the prospective vendors for noiseemitting equipment. Vibration data shall be asked for when adequate and required. All bids shall beduly reviewed and incomplete data sheets returned to the vendor for completion.

All bids shall be reviewed with respect to:

• measured/estimated and guaranteed noise levels• noise and vibration control design• noise and vibration control cost increment

If Company requirements cannot be met by vendors’ standard acoustic design, vendor shall presentspecial design alternatives together with extra cost estimate.

Based on vendor information, possible revised noise limits for single and package equipment shallbe entered in the noise data sheet for purchase. All noise data shall be guaranteed in contract.Preferably, documentation of the feasibility of the guaranteed values shall be provided.

Step 6

Further analysis and implementation of the requirements to sound insulation, sound absorption andvibration isolation to be performed.

Based on experience and valve/pump/compressor noise estimations, requirements for pipingacoustic insulation shall be implemented. The extent of the insulation will be revised as finalSupplier data for equipment and valves becomes available and as the process design develops.

A dedicated procedure for the calculation and evaluation of noise from piping systems is givenbelow, where the steps do not need to be taken in sequential order:

1. Evaluate the process system and identify the noise sources, such as valves, pumps andcompressors.

2. Collect adequate process data such as fluid type(s), pressure(s) and flow conditions.3. Identify pump and compressor power and rotational and vane tip speed(s).4. Using supplier’s estimate of valve noise levels and pump and compressor noise levels, evaluate

level both to surroundings and in pipe.5. Estimate max. flow velocities in pipes and corresponding noise levels.



6. Contact supplier for proposals for low noise valves and flow restriction orifices where foundnecessary.

7. Prepare requirements to valve trim (treatment), silencers, vibration isolation and acousticinsulation of pipes and equipment and/or maximum flow velocities.

8. Prepare and discuss alternative noise control measures with relevant persons in the projectprocess, piping and mechanical disciplines.

9. Try to "distribute" pressure drops in the system and/or avoid unnecessary pressure build up byuse of variable pump and compressor speed.

10. Update estimations, as relevant when adequate noise data are available.11. If possible, prepare a "follow up" measuring program in order to collect "feed back" on noise and

vibration in piping systems.

CONCAWE report 87/59 “The prediction of noise radiated from pipe systems - an engineeringprocedure for plant design” is recommended used as a basis for the estimations of pipe noise.

Step 7

In specified areas where whole body vibration limits may be exceeded, a review of the structuraldiscipline’s evaluation of the structural vibration levels with respect to human exposure should bemade.

Step 8

In cases where the main engineering contractor has the overall responsibility for noise controldesign of the installation, the need for carrying out full quality audits of sub-contractors should beevaluated, e.g. contractors for living quarters, process ship hulls, other modules, etc. This may berequired to verify conformity of requirements and interface items in the design.

Step 9

Based on guaranteed noise and vibration data for purchased equipment, layout, acoustic absorptiontreatment, sound insulation and vibration isolation, the acoustic and noise control status shall bedocumented. A Noise Prediction Report shall be prepared. Predicted values for valve, pipe andventilation noise shall be included. The noise levels may also be stated in the Working EnvironmentArea Charts.

Reports/Documentation : Noise Prediction Report

J.5.3 Fabrication

Step 10

All noisy equipment shall be tested during the Fabrication Acceptance Test. All test results shall bedocumented. The test should preferably be witnessed by the project noise control engineer oralternatively, another member of the project team who is capable of evaluating the test results anddetermining the need for implementation of remedial actions while at the test site (in accordancewith Step 11).



Step 11

Test results shall be reviewed against noise data sheet performance values. Excessive noise andvibration shall be documented and vendor shall start work on remedy to fulfil required levels.Company shall approve such remedial designs before being incorporated.

Improved equipment shall be subject to a re-test. If a factory re-test cannot be arranged, provisionsmust be made for a test on site, preferably in connection with the commissioning testing. A re-testmay be avoided if recommended remedial actions can be documented well enough so as to be ableto guarantee the noise level which the equipment will emit when finally in operation on theinstallation.

Step 12

The Contractor shall follow up delivery of materials, elements, equipment and machinery and itsinstallation on site with particular respect to acoustics, noise and vibration control. This is a part ofthe Mechanical Completion on acoustics, noise and vibration.

J.5.4 Commissioning

Step 13

Full noise level mapping of all areas shall be performed. Where feasible, this shall be made duringthe commissioning phase. For other areas, this shall be done after start-up when all relevant noisesources are in operation.

A preliminary noise test is recommended during commissioning of equipment, which representnoise sources that may lead to excess of the area limits.

The measurements shall be performed with equipment in normal operation.

A measuring program shall be included in the commissioning procedure. Whole body vibrationlevels, sound insulation and sound absorption shall be measured as applicable. Noise from theventilation system should be measured prior to start-up of the other major noise sources on theinstallation.

The measurement results from all the different types of measurements shall be documented in thePlatform Area Noise Survey Report.

Reports/Documentation : Platform Area Noise Survey Report

J.6 Process and System CalculationsA good and cost-effective design of an installation requires;

1. Inclusion of noise control requirements in all relevant package specifications.



2. Review of pipe sizing specifications and process specifications for coverage of noise control (thisshall already be included as part of the NORSOK line sizing requirements). Calculation of noisefrom pipes at different fluid velocities.

3. Evaluation of equipment or item noise reduction costs versus resultant noise levels in all areas inorder to optimise the technical/economical solutions.

4. Estimation of uncertainties in calculations - both due to calculation procedures/formulae andpossible “off spec” operating conditions. Estimation of “overall” or resultant uncertainty.

5. Evaluation of the relation between costs and uncertainties of specific noise control measures(high uncertainty in a high cost measure to be evaluated against low uncertainties in low costmeasures etc. - recommendations to be specified).

6. Adequate specification of retrofit noise control measures - related to uncertainties and costs ofinclusion of these or other measures in primary design and fabrication.

J.7 Exchange of InformationIn order to obtain a satisfactory level of co-operation between the Engineering Contractor and theCompany, exchange of information is of great importance.

Company data that should be made available for the Engineering Contractor:

• Experience data from earlier projects or present installations.• Preliminary manning plan for the installation.• Distribution of working hours by area for the different personnel positions in the platform’s

organisation.• Noise control requirements as given in frame agreement contracts. The information from the Engineering Contractor should cover the following documentation; • All Studies and Analyses which are documented in reports.• Noise Data Sheets for all types of equipment.• Special noise control measures for equipment and machinery.