NORSOK STANDARD DESIGN PRINCIPLES WORKING ENVIRONMENT

Transcription

1 NORSOK STANDARD DESIGN PRINCIPLES WORKING ENVIRONMENT

2 CONTENTS 1. FOREWORD 2 2. SCOPE 2 3. NORMATIVE REFERENCES International Directives and Standards Other References 3 4. DEFINITIONS AND ABBREVIATIONS Definitions Abbreviations 4 5. ANALYSES AND EVALUATIONS FOR CONTROL AND VERIFICATION General Procedures Working Environment Area Limits 7 6. WORKING ENVIRONMENT REQUIREMENTS Arrangements Ergonomics Technical Appliances Chemical Substances and Products Noise and Vibration Illumination Indoor Climate Outdoor Operations Radiation 16 ANNEX A Working Environment Area Requirements (Normative) ANNEX B Working Environment Area Chart (Normative) ANNEX C Typical Hazardous Substances (Normative) ANNEX D Noise Data Sheet (Normative) ANNEX E Vibration Limit Curves (Normative) ANNEX F List of Applicable Acts, Regulations, Standards and Guidelines for the Norwegian Continental Shelf (Informative) NORSOK Standard 1 of 33

3 1. FOREWORD This standard has been developed by the NORSOK Standardisation Work Group. ANNEXES A, B, C, D, E are normative. ANNEX F is informative. 2. SCOPE This standard applies to the design of installations for offshore drilling, production, utilization and pipeline transportation of petroleum. The purpose of this standard is to ensure, that the design of the installation promotes the quality of the working environment during the operational phase. This document addresses design principles related to the working environment. It also covers requirements to the procedures for control and verification of design in order to ensure that these principles are implemented. 3. NORMATIVE REFERENCES 3.1 International Directives and Standards The following EU Directives apply: EU Directive for Machinery Safety EU Directive for Safety Data Sheets The following international standards apply as guidelines if not otherwise stated in Clause 6 of this standard: NS-EN 292 EN 349 pren 563 pren 626 pren 1050 DIN VDE 0848, Part 4 ISO 717/1 ISO(DIS) 5349 Safety of machinery - Basic concepts, general principles for design, Part 1 and 2. Minimum gaps to avoid crushing of parts of the human body Safety of machinery - Temperature of touchable surfaces Principles for machinery manufacturers for the reduction of risk to health of hazardous substances emitted by machinery Safety of machinery - Risk assessment Safety at Magnetic fields Rating of sound insulation in dwellings Principles for the measurement and the evaluation of human exposure to vibration transmitted to hand ISO 2631/1 Evaluation of human exposure to whole body vibration- Part 1: General requirements NORSOK Standard 2 of 33

4 3.2 Other References CRIOP - A Scenario-method for Evaluation of Offshore Control Centres. SINTEF, Report No. A 89028, Trondheim. 4. DEFINITIONS AND ABBREVIATIONS 4.1 Definitions Working environment Work area and work place The totality of all physical, chemical, biological and psychological factors at work that may affect the employees' health and well being through acute trauma or lasting exposure. The influences from lasting exposure may be positive and negative. An area or place where tasks related to production, inspection or maintenance are performed. The following types of work areas are defined: Open; Areas with no substantial obstacles to the free. The areas are completely exposed to ambient conditions. Semi-open; Areas which are weather protected e.g. with weather louvres, and partially exposed to the open air. Enclosed; Areas which are fully protected against exposure to open air and ambient conditions. Manning Three levels of manning of work areas and work places are defined : Permanently manned; Work area manned at least 8 hours a day at least 50 per cent of the time. Intermittently manned; Work area where inspection, maintenance or other work is planned to last at least two hours a day at least 50 per cent of the time. Normally unmanned; Work area that is not permanently or intermittently manned. Hazard Working Environment Evaluation A source of possible injury or damage to health. A systematic evaluation including: NORSOK Standard 3 of 33

5 delimitation and break down of the installation wrt. one or more parameters (eg. area, activities during operation, type of equipment, chemical substance), identification of hazards and deviations from or problems in meeting specified requirements, identification and assessment of potential consequences to the employees' health, development of recommendations on remedial actions and/or follow-up activities. Working Environment Program A document covering: Working environment objective and goals and acceptance criteria for the risk of occupational accidents. References to Working environment requirements. References to applicable procedures for control and verification. Responsibilities for implementation of working environment requirements in design and for control and verification activities. Plans for control and verification activities. Status concerning performed activities. The Working Environment Program may be a separate document or integrated into a Safety Program. 4.2 Abbreviations None. 5. ANALYSES AND EVALUATIONS FOR CONTROL AND VERIFICATION 5.1 General This standard assumes that a Working Environment Program is established and maintained. Table 1 shows studies, evaluations and analyses to be performed and documented in order to control and verify that the design principles in Clause 6 are met. Responsibility and schedule for the different control and verification activities shall be defined in the Working environment program considering needs of timely input to design and procurement and of documentation. NORSOK Standard 4 of 33

6 Table 1. Overview of studies, evaluations and analyses. TYPE PURPOSE PERFORMED BY Experience checklist Organization and manning study Risk analysis Psycho-social evaluations Concept working environment evaluations Working environment area limits Working environment evaluations and analyses Working environment inspections. Working environment status To ensure experience transfer related to the working environment from installations in operation. To provide input to the establishment of working environment area requirements and to working environment evaluations and analyses. To verify compliance with Company acceptance criteria and to identify the necessary assumptions for concept selection and optimization and for detail engineering. To evaluate design and planned organization and manning in order to identify potential problem areas related to the psycho-social working environment. To identify and assess potential problem areas as input to concept selection and verification of design. To establish and implement area limits for illumination, temperature, concentration of chemical substances in the working atmosphere, ventilation and noise To identify and assess potential problem areas as input to concept definition and optimization and design development. To verify that the fabricated mechanical packages, modules and structures meet the working environment requirements. To provide an updated overview of the status on the different working environment factors. Company Company To be specified in working environment Program Company To be specified in working environment Program To be specified in working environment program To be specified in working environment program To be specified in working environment program To be specified in working environment program NORSOK Standard 5 of 33

7 5.2 Procedures Procedures for the defined studies, analyses and evaluations according to Clause 5.1 shall be developed and maintained. In general, the procedures 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/evaluation, organization of the analysis/evaluation, requirements to qualified personnel, 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, documentation and follow up of the results. References The procedures shall ensure that the requirements according to Clause 5.2 are implemented in the execution of the evaluations, analyses and final conclusions Risk Analysis The methods for risk analysis shall be adapted to the applicable acceptance criteria for the risk of occupational accidents, ref. Working Environment Program Concept Working Environment Evaluation The concept working environment evaluation shall provide input to concept selection and verification of the selected concept including cost estimates. The evaluation shall cover but not be limited to the following potential problem areas: Risks of severe accidents and strain injuries in heavy material handling. Risks of severe accidents and strain 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, eg. scaffolding. Noise emitting equipment adjacent to quite areas. Solitary work in permanently manned work areas. NORSOK Standard 6 of 33

8 5.3 Working Environment Area Limits General Detailed specifications of area limits for each room/work area which is readily accessible shall be established as input to engineering. ANNEX A shows applicable area limits for illuminance, temperature, noise and vibration for typical areas of an installation. For concentrations of chemical substances in the working atmosphere, area limits shall be established when there is a possibility of exceeding 10% of the threshold limit value according to Clause The area limits shall be documented on Working Environment Area Charts as shown in ANNEX B. Adequate calculations shall be performed in order to ensure implementation of the area requirements in design and data sheets for vendor packages. These calculations shall be documented on the Working Environment Area Charts where relevant. The implementation of the requirements shall be verified by appropriate measurement methods and documented in the Working Environment Area Charts Noise and Vibration Control During concept definition and optimization, it shall be ensured that: Major noise and vibration sources are localized. Possible use of low noise equipment is evaluated. A review of the localization of noisy equipment and areas in relation to silent areas is performed. The use of "buffer" zones are 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 sound insulation between areas. A safety margin of 3 db should be applied. Additive effects of several sources in the same area shall be taken into account. Noise Data Sheets for all potential noisy equipment shall be prepared and included in the enquiries, see ANNEX D. Vendors shall be requested to propose noise reduction measures, if equipment does not meet the requirements. All noise and vibration data shall be guaranteed in contract as well as procedures for testing and control of the guaranteed levels. Requirement to acoustic pipe insulation are specified. NORSOK Standard 7 of 33

9 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 exposure shall be calculated for typical categories of employees working in areas with a noise level above 83 dba. In areas where whole body vibration limits may be exceeded, structural vibration analysis are performed. Noise and vibration predictions are updated, based on vendor guaranteed noise and vibration data and the detail design of the platforms. During fabrication, it shall be ensured that all "noisy" non-standard equipment are tested according to a defined test procedure during the Fabrication Acceptance test. For standard equipment, data from earlier tests may be accepted. All important tests shall be executed or witnessed by qualified noise control engineer(s). During commissioning, it shall be ensured that a program for full noise mapping of the platform is included in the commissioning procedure Working Environment Evaluations The following evaluations and analyses shall be performed: Evaluation of the handling of hazardous substances/chemicals. All chemical substances that are planned for use during operation and maintenance and may represent a health hazard shall be identified. Typical chemicals to be evaluated are process chemicals, drilling mud, paint, diesel, lube oil and crude oil. The activities where there is a risk of exposure to the chemicals during transportation, storage, use and disposal shall be identified and the needs of control measures to reduce exposure shall be evaluated. Needs for safety showers or eye baths shall be evaluated. Coarse job safety analyses shall be carried out for each work area on the installation. Operation/drilling, repair/maintenance, material handling activities and walking shall be covered at a coarse level. Risks of severe injury or fatality due to moving parts of machinery, trapping/entanglement, fall to a lower level, slide/stumble/hit against, ejected materials, fire/explosions, hazardous substances shall be identified and assessed. Causes and potential consequences shall be identified and decisions on follow-up actions shall be made for identified hazards. Detailed job safety analyses shall be carried out for critical work places, which involve tasks with a high risk of accidents. Each task shall be broken down into steps and analyzed by a method similar to that for coarse job safety analysis. Also less sever accident risks shall be covered. Criteria for the selection of work places for the analyses include: frequently repeated manual tasks, especially in material handling, manual tasks in the risk zone of mechanized equipment. manual tasks involving hazards with potentially sever consequences, For safety analyses of machines, pren 1050 is referred to. NORSOK Standard 8 of 33

10 Ergonomic evaluation shall be performed for all workplaces, which involve tasks in operation or maintenance with a significant risk of strain injuries. For Norway, the requirements to ergonomic job analysis according to "Ergonomic Guidelines for the Offshore Industry", book IV, shall apply. Man-machine interface analyses (task analyses) shall be performed for control room and control cabin tasks, where human errors may cause accidents with severe consequences to personnel, environment or property. The evaluations shall cover normal operation including start-up and shut-down, emergency operations and maintenance /revision. The analyses shall cover personnel and system safety aspects, including the possibility to control process disturbances in a safe manner. The CRIOPmethod is referred to for complex and critical control rooms. Outdoor operation evaluations shall be carried out for permanently and intermittently manned work areas in order to identify potential problem areas related to the Wind Chill Factor. For identified critical areas and work operations, the duration of stay and work load shall be evaluated assuming normal work clothing in order to come up with needs of preventive measures in design. It is not required to repeat earlier performed evaluations or to evaluate design in cases where this represents a standard and previously accepted solution. In these cases, earlier evaluations or existing standard solutions and accompanying documentation shall be referred to Working Environment Inspections Working environment inspections shall be carried out during Mechanical Completion in order to verify that the physical installation meets the established requirements. Special checklists shall be prepared for this purpose Working Environment Status Working Environment Area Charts according to ANNEX B or equivalent shall be applied in documenting the working environment status. In principle, a Working Environment Area Chart shall be prepared for each room and area on the installation. To maintain a manageable number of Area Charts, several identical areas can be covered only with one typical chart, i.e. office, toilet/wc and escape/transport route. The Working environment area charts shall be kept updated with the results of predictions, and measurements and identified problem areas and deviations in evaluations and analyses and the status of decisions on remedial actions. NORSOK Standard 9 of 33

11 6. WORKING ENVIRONMENT REQUIREMENTS 6.1 Arrangements To avoid accidents when walking, floors in work areas and walkways shall be designed in accordance with the following: Preferred room height is 2300 mm. Minimum free height shall be 2100 mm. Walkways for access to permanently and intermittently manned work places shall be shown on relevant drawings. Main walkways shall have a minimum width of 1000 mm. For secondary walkways, a width of at least 1000 mm is preferred and a minimum width of 900 mm shall apply. Door openings shall be minimum 750 mm. Drips of oil and slippery liquid onto floor shall be avoided, eg. by using drip trays. Protruding objects shall be avoided in walkways. Need for antiskid surfaces shall be evaluated in all work areas where spill of slippery liquid, dusts. etc. may occur. Safe distances according to EN 349 shall apply between moving machinery parts and fixed objects. Offices, rest rooms and recreation rooms should preferably have access to daylight. All work areas shall have a layout that provides for safe access for operation and maintenance. For Norway, the design principles according to "Ergonomic guidelines for the offshore industry", book II, Section 6.1.9, shall apply. Workplaces shall be arranged to provide for contact with others. Solitary work shall be avoided in permanently and intermittently manned areas. 6.2 Ergonomics Workplaces shall be designed such that the personnel is not exposed to excessive work loads with risks of strain injury. For Norway, the design principles according to "Ergonomic guidelines for the offshore industry", book II, Chapters 5 and 6, and book III shall apply. The design principles in Chapter 7-9 of book II apply as guidelines. For control rooms and cabins and control panels where human errors may cause accidents with severe consequences to personnel, the environment or property, the following shall apply: The design shall be based on task analyses of functions, see Clause Displays and controls shall be designed in accordance with acknowledged ergonomic principles and in order to allow the operator to carry out his tasks in a safe manner. The number of and types of displays should however be minimized. NORSOK Standard 10 of 33

12 If visual displays (VDUs) are used, information should not be presented in a way which gives the operator memory problems or adds to his load of work. Total system overviews should be available from the displays, giving the operator opportunities to watch process performance. Controls and displays shall be located in a logical manner with respect to frequency of use and importance for safe operation and the movement of a control device should be consistent with the effect in direction and magnitude. They shall be clearly marked in the language of the country. 6.3 Technical Appliances General Technical appliances shall be designed in accordance with the methods and technical principles according to EN292-1 and EN Relevant type B European Norms shall be identified and implemented Hot/Cold Surfaces It shall not be possible to reach surfaces with a temperature above C or below C from work areas, walkways, ladders, stairs or other passage ways, ref. pren 563. Shields are preferred to insulation, unless insulation also is required for heat conservation or noise control. 6.4 Chemical Substances and Products Handling and Storage Manual handling of hazardous substances should be avoided. The use or automatic or remotely controlled equipment is preferred. Where this is not feasible, systems for safe manual handling shall be provided. The installation shall be designed such that all spillage is properly handled. The need for drain and their effectiveness, shall be evaluated in all work areas. There shall be a dedicated storage area for each type of chemical. These areas shall not be used for other purposes. The areas shall be properly ventilated and protected against fire. Chemicals that may react with each other shall not be stored together. NORSOK Standard 11 of 33

13 6.4.2 List of Hazardous Chemicals The design and instructions for use shall ensure that chemical substances and products containing the hazardous substances are avoided. Typical examples of chemical products are process and drilling chemicals, paint, lube oil and preservation chemicals. Hazardous substances according to ANNEX C1 are prohibited. Substances classified as carcinogenic, allergenic, or reproductive toxicants shall be identified and evaluated for substitution with less hazardous substances. A list of typical such chemicals is shown in ANNEX C2. For classification of chemicals in Norway, "Regulations relating to labelling, sale etc. of chemical substances and products that may involve a hazard to health" is referred to. All chemicals that follow the installation offshore or are included in instructions for operation and maintenance shall be documented on a Safety Data Sheet (Ref. EU Directive for Safety Data Sheets) Threshold Limit Values (TLV) Emissions of hazardous substances from machines shall be controlled, ref. pren 626. Under normal operation, the concentration of hazardous substances in the working atmosphere shall be as low as reasonably possible. The installation shall be designed such that, under normal conditions, the atmospheric concentration of hazardous substances do not exceed 1/3 of the TLV's according to the regulatory requirements in the country. For Norway, the TLV's specified in Guidelines from the Directorate of Labour Inspection (order no. 361) shall apply. 6.5 Noise and Vibration General Installation 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 given priority. Noisy equipment and equipment with high structure borne sound emission levels shall not be installed in the immediate vicinity of offices, laboratories, control rooms and sleeping/recreation areas. No noise sources which may significantly reduce the speech intelligibility shall be installed in the immediate vicinity of lifeboat stations and muster points. This also applies to the location of safety relief valves. High noise sources shall as far as possible be installed within the same area. NORSOK Standard 12 of 33

14 6.5.2 Area Noise Limits The 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 is 83 dba. The maximum allowable noise level in any situation is 130 dba ("PEAK"). This limit also applies 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 not closer than 1 m to equipment and other noisy installations. All limits refer to broad band noise without any distinct tonal characteristics. In case of tonal characteristics, the noise level limit shall be set 5 db lower. For areas, where the noise level limit according to ANNEX A is 85 dba or 90 dba, the former limit is preferred. The maximum area noise level limit of 90 dba shall apply, where a lower limit is unfeasible. In workshops and kitchen, the noise limits refer to background noise including ventilation system and external noise sources, but not manually controlled operations. For these operations, the maximum noise exposure for 12 hours working day applies. In control rooms, offices, computer rooms, radio rooms and laboratories the noise level limit refers to background noise including HVAC as well as noise sources in continuous use inherent in the area. The noise limits shall not apply to design emergency conditions, e.g. near safety relief valves, fire pumps or outdoor areas during full emergency flaring, etc. The noise level in the muster areas shall not exceed 90 dba and the noise level in the radio room, the emergency management room and the central control room shall not exceed 60 dba during emergency flaring. Access to control rooms, offices, laboratories etc. should be via corridors or buffer zones in which the noise level do not exceed the quiet room noise level by more than 5 db. Access from walkways to permanently manned areas should be provided without passing a zone with noise level above 83 dba. When selecting the design of enclosed spaces, i.e. when decisions on acoustic treatment shall be taken, the requirements to PA system and speech intelligibility shall be taken into account. Low reverberation times shall be adhered to. For work shops, laboratories, control rooms, radio room, meeting rooms, rest/tv rooms, dining room and offices, the average octave band sound absorption coefficient shall not be less than 0,4 in the frequency range 250 Hz to 2 khz. NORSOK Standard 13 of 33

15 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 sound transmission between adjacent rooms are shown in Table 2. Table 2. Minimum permissible air borne sound insulation indices ( R w ) between rooms in the living quarters (ISO 717/1). The maximum unfavourable deviation form the reference curve should not exceed 8 db. Noisy rooms Work rooms Silent rooms Corridors/ staircases Noisy rooms 40 db 1) 40 db 45 db 2) 35 db Work rooms 40 db 40 db 35 db Silent rooms 40 db 40 db 1) 2) Does not apply to partition between kitchen and dining room. Common partition with clinic/ward shall be avoided. "Noisy rooms" include gymnasium, TV-rooms/cinema, kitchen, dining, and change rooms. "Work rooms" are offices, meeting rooms, radio room, and control rooms. "Silent rooms" require a high degree of privacy and include cabins, clinic/ward, and rest rooms (eg. reading room) Vibrations ANNEX E shows the maximum limits for continuous whole body vibration from machinery and equipment which shall apply. Vibration limits are based on boundaries given in ISO 2631/1 "Evaluation of human exposure to whole body vibration- Part 1: General requirements". The limits are derived from the acceptability of the exposure of human beings to vibrations and are based on a 12 hour working day. The vibration limits are specified graphically as combined levels for vertical and horizontal movements. The limits cover the range 1-80 Hz in which the major body resonances occur. They are not intended to be extrapolated beyond this range. The vibration limits are categorized as follows: Category 1: Category 2: Category 3: Category 4: Category 5: Limits for accommodation areas Limits for control rooms, offices and laboratories Limits for all general work areas Limits for vibration locally to equipment 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. NORSOK Standard 14 of 33

16 Hand/arm vibrations shall meet the requirements stated in ISO(DIS) Illumination For the general level of illuminance at 1 m of elevation, the area requirements according to ANNEX A apply. The uniformity of the illuminance shall be equal to or better than E min /E mean = 0,5. For lighting calculations a maintenance factor, reflecting the environment and time between maintenance 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 a safety point of view. For Norway, the guidelines in "Luxtabeller" from the Norwegian Society for Promotion of Good Lighting shall be applied in the specification of task lighting. To avoid shadows, illumination planning shall take the location of fixtures, racks and mechanical equipment 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 from reflecting 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 see obstructions, 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 below 500 lux. High colour temperature, whiter light, should be used in areas with high lighting levels. 6.7 Indoor Climate Permanently 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 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. NORSOK Standard 15 of 33

17 Printers, copy machines etc. to be used by more than one person should not be placed in permanently manned rooms unless mounted in special cabinets. Supply air ducts in the living quarters shall after mechanical completion be cleaned to achieve a maximum of 2 % dust coverage. Materials containing synthetic mineral fibres, which are used in the living quarters or in permanently manned areas, shall be fully sealed. Carpets shall be avoided in cabins and dining rooms. 6.8 Outdoor Operations Workplaces in open and semi open areas shall be identified and the need for roof or shelter to protect the worker from wind and weather shall be evaluated. The Wind Chill Index should not exceed 900 kcal/m 2 (1044 W/m 2 ) for permanently and intermittently manned workplaces where work with unprotected hands is required. On installations that are planned for use in areas with arctic climate, outdoor operations shall be identified and reduced to a minimum. 6.9 Radiation The location of high voltage equipment (> 690 V) adjacent to permanently manned work areas and accommodation areas should be avoided. Electromagnetic field shall conform to the limits stated in the DIN VDE 0848, Part 4 - Safety at Electro Magnetic Fields. For protection against radiation from radioactive sources, the national legislation is referred to. The use of radioactive sources on an installation shall be minimized. A separate list of all radioactive sources on the platform shall be prepared. This list shall give information on location, type, radiation levels and required protection. The design shall ensure that radioactive sources can be safely transported, handled, applied and stored. NORSOK Standard 16 of 33

18 ANNEX A WORKING ENVIRONMENT AREA REQUIREMENTS (Normative) NORSOK Standard 17 of 33

19 ANNEX A WORKING ENVIRONMENT AREA REQUIREMENTS Room Description External access ways Stairs, escape routes, indoors Level of manning 1) Average illuminance level (lux) Temp. Min- Max o C Vibration limit Lay down area Muster area U 200 outdoor 2 75 Noise Total db (A) Fire pump room U General process and utility area I 200 outdoor 3 85/90 3) HVAC room U Switch-board room Central control room Rest rooms outside LQ I M 500 Adjustable M Battery room U Main generator room Emergency generator room Local control room U U I Inst/El. workshop M ) 50 Mechanical workshop/ welding Stores - Large parts Stores - Small parts M ) 50 M M Laboratory I/M Noise HVAC db (A) NORSOK Standard 18 of 33

20 1) Room Description Level of manning 1) Average illuminance level (lux) Temp. Min- Max o C Vibration limit Noise Total db (A) Paint shop I Sand blast room I ) 55 Workshop office M Crane cabin M 400 Adjustable Rest room in LQ Tv room etc I Dining room M Laundry M Kitchen M ) 55 Dish washing M Gymnasium I Cabins I/M ) Clinic/ward M Offices/meeting rooms in living quarters Offices, other areas M M Radio room M Toilets/ Change room I Drillfloor M 350 outdoor 3 85 Monkey Board M 200 outdoor 3 85 Pipe rack area I 150 outdoor 3 85 Shale shaker I 200 outdoor 3 85/90 3) Mud room, Mixing area Mud room, Test station I 150 outdoor 3 85/90 3) I 300 outdoor 3 85/90 4) Mud lab I Noise HVAC db (A) M = Permanently manned NORSOK Standard 19 of 33

21 I = Intermittently manned U = Normally unmanned 2) 3) 4) The noise limit refers to background noise including ventilation system and external noise sources, but not manually controlled operations. For these operations, the maximum noise exposure for 12 hours working day applies. 85 dba is preferred in order to ensure that the individual employee's maximum exposure to noise during a 12 hours working day is 83 dba. A maximum area noise level limit of 90 dba shall apply, where the lower limit is unfeasible. The control system shall allow for free cooling in cabins to 16 C. This shall not be a thermo dynamic design requirements. NORSOK Standard 20 of 33

22 ANNEX B WORKING ENVIRONMENT AREA CHAR T (Normative) NORSOK Standard 21 of 33

23 ANNEX B WORKING ENVIRONMENT AREA CHART WORKING ENVIRONMENT AREA CHART Doc.no. Rev. Installation: Room/area name: Module/level: Area no.: WORKING ENVIRONMENT AREA LIMITS Factor Limit/level Predicted Design status As built As built status Noise: Total HVAC Vibration Illumination Temperature Types of hazardous substances: GENERAL Factor Evaluations/ analyses Description (hazards/deviations) Decision Status Arrangements Ergonomics Technical appliances Chemical substances Outdoor operations Radiation Status: OK; Action required; Deviation, action pending; Deviation, approved; Not identified; Not applicable PREPARED BY: CHECKED BY: APPROVED BY: NORSOK Standard 22 of 33

24 ANNEX C TYPICAL HAZARDOUS SUBSTANCES (Normative) NORSOK Standard 23 of 33

25 ANNEX C1 PROHIBITED HAZARDOUS SUBSTANCES Compound Formula CAS no. Reference 2-naftylamin and their salts SAM 4-aminobifenyl and their salts SAM Benzidin and their salts SAM 4-nitrodifenyl SAM Asbestos Regulations relating to asbestos Cadmium compounds Par-com-I Carbontetrachloride CCl Montr.prot, Tx,K3 CFC Montr.prot, SFT Halon Montr.prot, SFT Mercury compounds Par-com I PCB Par-com I, SFT NORSOK Standard 24 of 33

26 ANNEX C2 HAZARDOUS SUBSTANCES THAT SHOULD BE AVOIDED Compound Formula CAS no. Reference Arsenic compounds Benzene C 6 H K2 Bitumen K3 Chloroform CHCl T,K3 Chromates (VI) Ethyleneglycol monoethyl ether ( 2-Etoxyethanol) Ethyleneglycol monoethyl ether acetat ( 2-Etoxyethylacetat) Ethyleneglycol monomethyl ether ( 2- Metoxyethanol) Ethyleneglycol monomethylether acetat ( 2-Metoxyethylacetat) R R R R Par-com - II K3,A,R Formaldehyde HCHO A,K3,T n-hexane C 6 H R Isocyanates Lead compounds Methanedichloride CH 2 Cl K3 Nikkel Compounds Trichloroethylene K3 A Par-com II 1,1,1-Trichloroethane Montr.prot A NORSOK Standard 25 of 33

27 ANNEX C3 REFERENCES ParCom = Paris Commissions 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. With amendments SFT = Regulations from Norwegian State Pollution Control Authority (SFT) SAM = Norwegian Regulations concerning systematic follow-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), Highly toxic (Tx) or Toxic (T) according to Regulations concerning labelling, sale etc. of chemical substances and products which may involve a hazard to health. NORSOK Standard 26 of 33

28 ANNEX D NOISE DATA SHEET (Normative) NORSOK Standard 27 of 33

29 ANNEX D SDS-050 Noise data sheet NORSOK Standard 28 of 33

30 ANNEX E VIBRATION LIMIT CURVES (Normative) NORSOK Standard 29 of 33

31 ANNEX E1 VIBRATION LIMIT VERTICAL AXIS NORSOK Standard 30 of 33

32 ANNEX E2 VIBRATION LIMIT HORIZONTAL AXIS NORSOK Standard 31 of 33

33 ANNEX F LIST OF APPLICABLE ACTS, REGULATIONS, STANDARDS AND GUIDELINES FOR THE NORWEGIAN CONTINENTAL SHELF (Informative) NORSOK Standard 32 of 33

34 ANNEX F LIST OF APPLICABLE ACTS, REGULATIONS, STANDARDS AND GUIDELINES FOR THE NORWEGIAN CONTINENTAL SHELF Acts and Regulations Acts, regulations and provisions for the petroleum activity, Vol. 1 and 2. Norwegian Petroleum Directorate, Stavanger. See especially: Act relating to worker protection and working environment Regulations concerning 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 Also other regulations include requirements of relevance to the working environment. The following Norwegian regulations for the onshore industry apply as guidelines if not otherwise stated in Chapter 6 of this standard: 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 Standards and Guidelines The design principles according to the following Norwegian standards and guidelines apply as recommendations if not otherwise stated in Chapter 6 of this standard: Ergonomic guidelines for the offshore industry, OLF, Report No. 033, Stavanger, 1994 Lux tables (Luxtabeller), Norwegian Society for Promotion of Good Lighting NORSOK Standard 33 of 33