DNVGL-OS-A301 Edition April 2016

Transcription

1 OFFSHORE STANDARDS DNVGL-OS-A301 Edition April 2016 The content of this service document is the subject of intellectual property rights reserved by ("DNV GL"). The user accepts that it is prohibited by anyone else but DNV GL and/or its licensees to offer and/or perform classification, certification and/or verification services, including the issuance of certificates and/or declarations of conformity, wholly or partly, on the basis of and/or pursuant to this document whether free of charge or chargeable, without DNV GL's prior written consent. DNV GL is not responsible for the consequences arising from any use of this document by others. The electronic pdf version of this document, available free of charge from is the officially binding version.

2 FOREWORD DNV GL offshore standards contain technical requirements, principles and acceptance criteria related to classification of offshore units. April 2016 Any comments may be sent by to This service document has been prepared based on available knowledge, technology and/or information at the time of issuance of this document. The use of this document by others than DNV GL is at the user's sole risk. DNV GL does not accept any liability or responsibility for loss or damages resulting from any use of this document.

3 CHANGES CURRENT This is a new document. Changes - current Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 3

4 CONTENTS Changes current...3 Contents Chapter 1 Introduction... 8 Section 1 General Introduction Objective Scope Application Structure... 8 Section 2 References General Normative references Noise Vibration Illumination Indoor climate Section 3 Abbreviations and definitions Definition type of offshore units Definition main parameters Definitions and characteristics systems and components Abbreviations Chapter 2 Technical requirements Section 1 Introduction Overview Enforcement of limits...17 Section 2 Noise and acoustics Area noise level limits Introduction Additional area noise level requirements Maximum noise levels Personnel noise exposure Building acoustic requirements Airborne sound insulation Impact sound insulation...23 Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 4

5 3 Measurements of area noise levels and acoustical properties Measurement standards and guidelines Test programs Measurement positions Amount of test locations Measurement requirements Reporting Test conditions Introduction Preferred operating condition Alternative test procedures and operating condition Environmental conditions Test areas - State of completion Section 3 Vibration Vibration limits Objective Limitations Pedestal constructions Measurements of vibrations Measurement standard Test program Selection of measurement positions Number of measurement positions Measurement - units and equipment Reporting Test conditions Introduction Comments regarding vibration Section 4 Illumination Area light limits Objective Limitations Illumination limits Preliminary analysis Application of the limits Task lighting Design Areas not covered LED lights...34 Contents Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 5

6 2 Measurements of the lighting Measurements Test program, -location and number of measurements Measurements Test conditions Light measurements Stray light Light from adjacent areas Section 5 Indoor climate Requirements for the on board climate Introduction Classification of spaces on board Limit values Required regulation NORSOK Compliance Measurements of the relevant air properties and qualities Simplification of the documentation Parameters to be verified by measurements Test program Measurement guidelines Measurement standard Test locations in the accommodation Test locations in workspaces Test conditions System requirements Redundancy System failure Maintenance Filters Contents Chapter 3 Classification and certification...45 Section 1 General requirements Introduction General Objective Applicable rules Application Deviations and exceptions Alternative solutions Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 6

7 2.3 Execution Section 2 Classification Introduction Class notation and qualifiers General Compliance with NORSOK Overview Information and documentation Documentation Content requirements In-service requirements Alterations and modifications Documentation storage Renewal Section 3 Measurement equipment Certification...51 Contents Historic changes...52 Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 7

8 CHAPTER 1 INTRODUCTION SECTION 1 GENERAL 1 Introduction This standard contains requirements for noise, vibration, illumination and indoor climate on board offshore facilities. 2 Objective The objective of this standard is to: Serve as a reference document in contractual matters between purchaser and contractor Serve as a guideline for designers, purchasers and contractors Specify noise, vibration, illumination and indoor climate requirements and procedures for offshore units. Chapter 1 Section 1 3 Scope This standard describes sets of limits for noise, vibration, illumination and indoor climate for use on board offshore facilities. This standard has been written for general world-wide application. Local governmental regulations may include requirements stricter than listed in this standard depending on the type, location and intended service of the offshore unit. This standard aims at attaining an offshore unit with controlled and controllable working environment. Compliance with the rules is to be verified through field measurements of defined parameters. Prescriptive requirements are not intended to inhibit application of practicable improvements. 4 Application This standard applies primarily to mobile and floating offshore units (MOU). However, this standard may be used in connection with all kind of offshore units in the oil & gas industry as: Floating and mobile offshore units Fixed offshore installations Complete installations or single modules New buildings, conversions and modifications. This standard is not to be applied on ships like e.g. offshore support vessels, shuttle tankers etc. For such vessels reference is given to the rules for ships. This standard may be applied at all development stages from pre phase design to final construction and commissioning. Unless specifically mentioned this standard applies when the offshore unit is in normal operation. For selfpropelled mobile offshore units this standard also applies during transit. For mobile offshore units, this standard may be used as technical basis for offshore classification. Detail procedural requirements for such an application are described in Ch.3. Guidance note: As detailed in Ch.3, the application of the standard for offshore classification is governed by class notations. As an example, compliance to the requirements to NORSOK S-002 as given in Ch.2 is only required for units with the class notation Comf-MOU(N). ---e-n-d---of---g-u-i-d-a-n-c-e---n-o-t-e--- Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 8

9 5 Structure This standard is structured in the following three chapters: Ch.1: This first introduction chapter is completed with references, abbreviations and definitions Ch.2: The second chapter includes the technical requirements relevant for describing the working environment on board in terms of noise, vibration, illumination and indoor climate Ch.3: The third chapter describes the procedures to be followed when this standard is used as technical basis for offshore classification (as applicable for MOU s) Chapter 1 Section 1 Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 9

10 SECTION 2 REFERENCES 1 General Relevant national and international standards specifying criteria related to comfort aspects of noise, vibration, illumination and indoor climate have been used as basis for this standard combined with knowledge about achievable offshore levels applying good engineering practice. 2 Normative references The normative references are cited at appropriate places in the text. For dated references, only the edition cited applies. 3 Noise Chapter 1 Section 2 Table 1 Informative and normative references with regard to noise Reference Edition Title IEC Electro acoustics Sound level meters Part 1: Specifications ISO Quantities and units Acoustics ISO 1683 Preferred reference values for acoustical and vibratory levels ISO Acoustics Rating of sound insulation in buildings and of building elements Part 1: Airborne sound insulation ISO Acoustics Rating of sound insulation in buildings and of building elements Part 2: Impact sound insulation ISO Acoustics Field measurements of sound insulation in buildings and of building elements Part 1: Airborne sound insulation ISO Acoustics Measurements of sound insulation in buildings and of building elements Part 7: Field measurements of impact sound insulation of floors ISO Acoustics Laboratory measurements of sound insulation of building elements Part 2: Measurements of airborne sound insulation ISO Acoustics Measurement of noise on board vessels NORSOK S Working Environment MSC.337(91) Code on noise levels on board ships 4 Vibration Table 2 Informative and normative references with regard to vibration Reference Edition Title ISO Mechanical vibration and shock Guidelines for the overall evaluation of vibration in merchant ships ISO Mechanical vibration, shock and conditioning monitoring Vocabulary Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 10

11 Reference Edition Title ISO Amd Mechanical vibration and shock Evaluation of human exposure to whole body vibration Part 1: General requirements ISO Mechanical vibration and shock Evaluation of human exposure to whole body vibration Part 2: Vibrations in buildings (1 80 Hz) ISO Guidelines for the evaluation of the response of occupants of fixed structures, especially buildings and off-shore structures, to low-frequency horizontal motion (0,063 to 1 Hz) NORSOK S Working Environment 5 Illumination Table 3 Informative and normative references with regard to illumination Chapter 1 Section 2 Reference Edition Title EN Light and Lighting Lighting of work places Part 1: Indoor work places EN Light and Lighting Lighting of work places Part 2: Outdoor work places EN Light and Lighting Basic terms and criteria for specifying lighting requirements ISO Ergonomic design of control centres Part 6: Environmental requirements for control rooms EN Lighting applications Emergency lighting CIE Maintenance of indoor electric lighting systems ISO/CIE Characterization of the performance of illuminance meters and luminance meters NORSOK S Working Environment DIN Photometry; classification of illuminance meters and luminance meters DIN Daylight in interiors; measurement DIN Artificial lighting Part 6: Measurement and evaluation IMO Resolution A.1023(26) (MODU Code) SOLAS Ch.II-1 Part D Reg Code for the construction an equipment of Mobile Offshore Drilling Units 2010 International Convention for the Safety of Life at Sea Main source of electrical power and lighting systems MSC/Circ Guidelines on ergonomic criteria for bridge equipment and lay-out Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 11

12 6 Indoor climate Table 4 Informative and normative references with regard to indoor climate Reference Edition Title ISO 7547 Shipbuilding Air-conditioning and ventilation of accommodation spaces on board ships Design conditions and basis of calculations ISO 7730 ISO 7726 ASHRAE 1991 Applications handbook Ergonomics of the thermal environment Analytical determination and interpretation of thermal comfort using calculation of the PMV and PPD indices and local thermal comfort criteria Ergonomics of the thermal environment Instruments for measuring physical quantities Chapter 1 Section 2 ANSI/ASHRAE Standard 55 ANSI/ASHRAE Standard Thermal Environmental Conditions for Human Occupancy 2007 Ventilation for Acceptable Indoor Air Quality CIBSE 1) Commissioning Code A 1996 (2006) Air Distribution Systems NORSOK S Working Environment Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 12

13 SECTION 3 ABBREVIATIONS AND DEFINITIONS 1 Definition type of offshore units A list of various types of offshore units is given below. There may be other types of offshore units in the oil & gas service not in this which qualifies for this standard. Table 1 Definition of terms MOU Term Fixed offshore Unit Mobile Offshore Units Definition An offshore installation not to be moved to another location. Fixed installations could typically be steel jackets and other installations mounted to the sea bed. Chapter 1 Section 3 2 Definition main parameters The main parameters determining the human comfort are defined below. Further definitions of sound and vibration quantities and units are given in ISO : 2007 and ISO 1683:2008. Table 2 Definition of terms Term Definition Noise Noise level Continuous noise level A-weighted noise level C-weighted noise level A-weighted maximum noise level C-weighted maximum noise level Occupational time Personnel noise exposure level Sound absorption coefficients Average sound absorption coefficients Audible air pressure fluctuations generated by the machinery, equipment and structure in the Hz frequency range A-weighted sound pressure level LAeq(T) in db, measured with a sound level meter in which the frequency response is weighted according to the A-weighting curve (ref. IEC ) A noise level that does not change over time, db The noise level as described/measured with the A-filter, dba The noise level as described/measured with the C-filter, dbc The maximum noise level within a given time period measured with the FAST-response, dba-fast The maximum noise level within a given time period measured with the PEAK-response, dbc-peak The duration of exposure to noise and vibration levels Personnel noise exposure is the equivalent sound pressure level to which a person is exposed to for a defined period of time. The ratio between the absorbed sound energy and the energy of the sound wave impinging on a surface. In this context this is about the same as the ratio between the reflected and the impinging sound wave relative to a defined surface In this context, the average absorption coefficient representing the space averaged and frequency averaged (over the octave bands Hz) sound absorption with a single number Airborne sound insulation Airborne sound insulation of partitions as defined in ISO and ISO Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 13

14 Term Definition Impact sound insulation Airborne sound insulation of floors as defined in ISO and ISO Vibration Vibration velocity Overall vibration level Overall acceleration level Illumination Structural motion in the frequency range 1 80 Hz The overall frequency weighted RMS value of vibration velocity measured in accordance with ISO 6954: 2000 One number describing the integrated vibration level within a certain frequency range. In this standard the overall vibration velocity level is given for the frequency range 1 80 Hz and is expressed as the velocity (mm/s RMS) One number describing the integrated vibration level within a certain frequency range. In this standard the overall vibration acceleration level is given for the frequency range Hz and is expressed as the acceleration (mm/s 2 RMS) The lighting conditions in an area Chapter 1 Section 3 Illuminance Mean illuminance Maintained illuminance The luminous flux incident-per-unit area, i.e. the amount of light falling on an object or surface. Illuminance is measured in units of lux (lm/m 2 ). The mean illuminance in lux as measured over a defined area. Denoted E m Minimum average permitted illumination for an area/room in lux, i.e. the average illumination over an area/room at the time when maintenance should be carried out (ref. EN 12665) Uniformity of illumination Ratio of minimum illuminance to average illuminance of a surface. Denoted U 0 Maintenance factor Visual task Task area Immediate surrounding area Background area Task light General illumination Illuminance grid Emergency lighting Indoor climate Air supply quantity Air temperature control span Factor describing reduction in illuminance due to usage of luminaries over time, cleanliness etc. Visual elements of the work being done A confined area in the work space where visual tasks take place, e.g. an office desk, work benches etc. The size of the task area varies according to the task carried out An area around the task area within the visual field. At least 0.5 m wide The area outside/adjacent to the immediate surrounding area Lighting mounted with the purpose of providing light in confined areas and for special tasks. This may e.g. be reading light in cabins and in offices Lighting designed to provide a substantially uniform level of illuminance throughout an area, exclusive of any provision for special, localized tasks. Such lighting should be provided by fixed luminaries. A system of points for calculations and measurement of the illumination, ref. EN Lighting for use when the normal power supply fails The indoor climate is in this context defined by the following descriptors: Indoor temperature, temperature gradient, air velocity, air supply (carbon dioxide concentration) and humidity The total amount of supplied air to any given space which may consist of a percentage recirculated return air in addition to the fresh air supply quantity The temperature interval which each designated space shall be able to satisfy Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 14

15 Air velocity Term Ambient outside air temperature Fresh air supply quantity Temperature Thermal comfort Vertical gradient Relative humidity Definition The measured mean absolute velocity of a mass of air in motion The actual air temperature measured out of direct sun exposure outside the facility, expressed in ºC The quantity of fresh/outside air per person supplied to a space, expressed in l/s or m 3 /h. The average dry bulb temperature of a specific number of temperature measurements in a particular space, expressed in C A temperature range perceived as comfortable for most persons indoor Vertical air temperature difference Relative humidity is the actual amount of water vapour in the air compared to the saturation amount of water vapour in the air at the same temperature and pressure. Usually expressed as percentage of saturated air having a relative humidity of 100% Chapter 1 Section 3 Relative humidity range The range of which the relative humidity must be within during all external conditions the HVAC is designed for 3 Definitions and characteristics systems and components The most commonly used expressions, concepts and systems in relation to offshore units and the working environment as covered in this standard are defined below. Table 3 Definitions and characteristics of system and components Term Accommodation area Cabin Recreation room Control room or control station Office Workshop Machinery area Outdoor area Definition Space used for cabins, offices, lavatories, corridors, hospitals, cinemas, public spaces etc. Service spaces and control stations may be included within the accommodation area. An accommodation room intended for sleeping or recreation only General leisure areas like lounges, coffee bars but also TV rooms, cinemas, multipurpose room etc. General term for any location space where essential control functions are performed during transit, normal operations or emergency conditions Typical examples are central control room, radio room, process control room, bridge, emergency response room etc. For the purpose of compliance with the SOLAS Convention and the MODU Code, the emergency generator room, UPS rooms and fire pump rooms are defined as control stations. However, emergency generator room, UPS rooms and firepumps rooms are not control rooms from a working environment point of view. Space for intellectual activities including discussions/meetings between a small number of personnel Areas for maintenance of equipment like machines, valves, electronics etc. Pump area, power plants, HPU rooms, compressor areas but also production/utility areas with process, thermic fluids or water pipes A collective term for the areas out in the open. It may be open deck areas, walk ways etc. In principle the concept contains outdoor muster areas, store areas and laydown areas. However, such designated areas are handled by its own name and may have other criteria. Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 15

16 Term Utility area Work area Living area Permanently manned Intermittently manned Definition Areas for combustion equipment, power generation, switchboards, boiler, water injection Facilities like workshops, storage areas and general machinery A utility area should not include production, drilling or wellhead equipment, and will not normally be classified as significant hazardous areas. Area of the installation where personnel stays or move in connection with work Area of the installation where personnel stays or move in connection with non-working activities Work area or workplace manned at least 8 h a day for at least 50 % of the installation's operation time Work area or workplace where inspection, maintenance or other work is planned to last at least 2 h a day for at least 50 % of the installation's operation time Chapter 1 Section 3 Normally unmanned Task area Immediate surrounding area Work area or workplace that is not permanently or intermittently manned Area within which a visual task is carried out A band surrounding the task area within the visual field In the case of disagreement between the parties of the status of some rooms/areas, DNV GL shall decide. 4 Abbreviations The most commonly used abbreviations in relation to offshore units and the working environment as covered in this standard are as defined below. Table 4 Description of abbreviations Abbreviation ASHRAE CIBSE HVAC IEC IMO ISO CIE NORSOK MSC Description American Society of Heating, Refrigeration and Air-Conditioning Engineers The Chartered Institute of Building Service Engineers Heating, ventilation and air conditioning International Electro technical Commission International Maritime Organization International Organization for Standardization International Commission on Illumination NORsk SOKkels konkurranseposisjon Norwegian Oil Industry Association and the Federation of Norwegian Engineering Industries Marine Safety Committee Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 16

17 CHAPTER 2 TECHNICAL REQUIREMENTS SECTION 1 INTRODUCTION 1 Overview This section states requirements for noise, vibration, illumination and indoor climate for three different ratings. Selection of one of the three ratings determines all the various working environmental qualifiers related to noise, vibration, illumination and indoor climate on board the offshore facility. Where applicable, references are made to national and international recommendations, standards and guidelines on the noise, vibration, illumination and indoor climate for use on board offshore facilities. It is noted that there may be national and/or company specific requirements which may be different than the requirements listed in this standard. Chapter 2 Section 1 2 Enforcement of limits All limits specified in the tables below shall be fulfilled. However, dispensations from certain requirements may in special circumstances be acceptable if it is documented that compliance will not be possible despite relevant and reasonable technical reduction measures. Guidance note: Guidelines for handling excessive noise, vibration and illumination levels are published by DNV GL. ---e-n-d---of---g-u-i-d-a-n-c-e---n-o-t-e--- Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 17

18 SECTION 2 NOISE AND ACOUSTICS 1 Area noise level limits 1.1 Introduction This standard states requirements for noise, related to human comfort and working environment on board offshore facilities. The most typical areas are listed in Table 1 below. For areas not included, limits for areas/ rooms with a similar need for comfort/ working environment shall be selected. Table 1 Total area noise level limits on board offshore units 8) Location 1 [dba] Comfort rating number (crn) 2 [dba] 3 [dba] Chapter 2 Section 2 Process and utility modules: Unmanned machinery rooms (combustion engines, fire water units, BOP control unit etc.) 110 1) HVAC rooms General process and utility areas (turbo machinery, compressors, pumps, fans etc.) HPU rooms 90 2) BOP & wellhead areas Normally unmanned outdoor areas e.g. moon pool Trafo, switchboards & battery rooms External walk- & access ways Stairs & walkways in modules ) Lay down area Muster area Local eqip./instr. room Heavy tool store and similar store rooms/areas 75 4) Workshop, paint shop etc. 70 4) Crane cabin 5) Coffee bar outside LQ 65 4) Laboratory Local control room Corridors/stairs in enclosed machine/work area Workshop office / store office etc Central control room 50 4) Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 18

19 Comfort rating number (crn) Location 1 [dba] 2 [dba] 3 [dba] Drilling Modules: Cementing unit, HP mud pump and HPU rooms 90 2) Mud mixing, mud cleaning, shale shaker room Drill Floor, monkey board & pipe rack area Drill floor shelter and Pipe Rack Shelter Operators cabin in drilling units (Drillers cabin & mud, cement, shaker room etc.) Mud lab Chapter 2 Section 2 Accommodation Spaces: HVAC Techn. rooms / electro rooms Dish washing / scullery / laundry machine area 75/85 6) Open deck recreation areas Stores / general store 70 4) Laundry area for sorting, folding, ironing etc Galleys, without food proc. eq Corridors, change rooms & toilets Mess rooms / dining rooms / gymnasium Servery and pantries Telecom & radio equip. room 7) Radio room 50 4) Offices, meeting & conf. Room 50 4) Cabins 45 4) Hospital/ward 45 4) Coffee bars 50 4) Recreation rooms 50 4) Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 19

20 Location 1 Comfort rating number (crn) 1) Machine rooms with equipment running without special attention. Necessary dials and controls should be outside the machine room. Only very brief inspections are allowed. No passage through the rooms to other areas. [dba] 2 [dba] 2) 90 dba applies during operation of the equipment with maximum permitted stay per day of 1 hour. During maintenance, cleaning etc. the noise limit of 85 dba applies 3) The noise level shall comply with the surrounding areas, i.e. for stairs/corridors in quiet areas like the LQ a noise level limit 60 dba applies while 80 dba applies for corridors in machinery areas 4) For fixed installations, the total area noise level requirement shall be 5 dba stricter 5) Crane operator cabin Applies to a full crane operation cycle 6) In separate rooms dedicated to unattended operation of scrub, coarse pot equipment and laundry machinery, 85 dba applies 7) These rooms are equipment room. The operator dependent communication is assumed to take place in the radio room or by phone in offices etc. 8) Ear protectors shall be available and used while entering areas with noise levels above 85 dba 3 [dba] Chapter 2 Section Additional area noise level requirements For the highest level of comfort crn 1 the noise contribution from the HVAC shall be at least 5 dba lower than the total area noise level limit as listed in Table For the highest level of comfort crn 1, noise levels inside cabins with sleeping personnel shall not exceed 55 dba during helicopter take-off/landing operations. 1.3 Maximum noise levels In addition to the area noise level limits defined in Table 1 the maximum permitted noise levels shall not exceed the levels presented in Table 2. Table 2 Maximum permitted noise level on board caused by machinery or process Comfort rating number (crn) Location 1 [dbc peak] 2 [dbc peak] 3 [dbc peak] Maximum permitted noise levels Personnel noise exposure The concept of personnel noise exposure levels has become the most important issue regarding noise and working environment, and describes the noise energy the personal will be exposed to during their work shifts. The personnel noise exposure depends on the combination of area noise levels and the area occupational times. The personnel noise exposure must be calculated and the result compared with the recommended limits listed in Table 3. Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 20

21 Table 3 Recommended maximum personnel noise exposure Location 1 [dba] Comfort rating number (crn) 2 [dba] All personnel categories for a 12 hour period In the calculation of the personnel noise exposure for comparing with the limits listed in Table 3 personnel noise protection shall only be assumed in engine rooms (with area noise level limits of 110 dba and on the helideck with helicopters) In general, a personnel noise exposure study shall be provided for approval. This calculation of the personnel noise exposure levels shall be based on the manning study and measured area noise levels. 3 [dba] Chapter 2 Section In the case area noise levels on board exceed the noise level limits given in Table 1, the personnel noise exposure study will be particular important. Based on the combination of the actual area noise levels, possibilities for noise reduction and the personnel noise exposure levels may the measured deviations be accepted or rejected. Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 21

22 2 Building acoustic requirements 2.1 Airborne sound insulation Limits for the airborne sound insulation between the different types of room are specified in this document. The rooms are classified according to the activities. Guidance note: For airborne sound insulation reference is given to the ISO standards ISO and ISO regarding the definition of the apparent sound reduction index as measured on board. For further details about the measurements see [3.1]. As a guide the various criteria to sound reduction indices are listed below in Table 4. These sound insulation indices refer to field measured sound insulation, not laboratory sound insulation for building components or measurements in mock-ups. However, sound insulation tests in Mock-Ups provide very good indications and are recommended to be performed before installation on board. Table 4 Airborne sound insulation requirements for fixed, floating and/or mobile units Chapter 2 Section 2 Comfort rating number (crn) Location ) [R' w, db] [R' w, db] [R' w, db] Between cabins and other low noise rooms Between cabins and corridors/stairways Between cabins and "work rooms" Between work rooms Between work rooms and corridors Between noisy rooms Between noisy rooms and corridors Technical rooms and low noise rooms Technical rooms and work rooms Technical rooms and corridors/stairs ) For crn 3 it is sufficient to provide the laboratory measured sound insulation index R w. The laboratory measured sound insulation index must be at least 3 db higher than the requirement given as the field measured index R' w. 2) The general room types in Table 4 designate the following room: "Low noise rooms : Cabins, hospital, rest rooms etc. Work rooms : Offices, meeting rooms, conference rooms, control rooms, radio rooms Noisy rooms : Exercise rooms, television/cinema, printer/computer rooms, galley etc. "Technical rooms": Electrical panels, transformers, HVAC etc. ---e-n-d---of---g-u-i-d-a-n-c-e---n-o-t-e In principle, cabins shall not be located adjacent to noisy rooms (as listed above) or other locations with comparatively high noise levels. Corridors in the accommodation areas which lead to noisy areas shall be fitted with a buffer zone, i.e. two doors with a space in between. Care shall be taken to prevent airborne noise transmission between rooms through HVAC ducts and electrical installations. Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 22

23 Guidance note: Mainly due to a multitude of transmission paths field measurements normally yield a lower sound reduction index than results obtained in a laboratory for the same partition. Therefore it is recommended during the engineering phase to select partition walls (e.g. panels between cabins) with an associated laboratory measured sound reduction index at least 3 db higher than the limit specified in Table Impact sound insulation ---e-n-d---of---g-u-i-d-a-n-c-e---n-o-t-e Limits for the normalized impact sound pressure level in the vertical direction between the different types of room are specified as a part of the offshore class. These limits apply only in the cases where the receiving room is a cabin or a "low noise room". The rooms are classified according to the activities. This specification applies only to crn 1. Guidance note: For the impact sound insulation reference is given to the ISO standards ISO and ISO for the definition of the field measured normalized impact sound pressure level as measured on board. As a guide the various criteria to sound reduction indices are listed in Table 5 below. The indices in Table 5 refer to field measured, i.e. the weighted apparent normalized impact sound pressure level as measured on board, not in laboratories. For explanation of the general room types in Table 5 see [2.1]. Chapter 2 Section 2 Table 5 Impact sound insulation requirements for offshore units Location crn 1 [L' n,w db] crn 2 [ L' n,w db] crn 3 [ L' n,w db] Between cabins and/or low noise rooms Between work rooms and cabins/ low noise rooms Between "noisy rooms and cabins/ low noise rooms e-n-d---of---g-u-i-d-a-n-c-e---n-o-t-e--- Guidance note: Due to a multitude of transmission paths field measurements normally yield a higher normalized impact sound pressure level than results obtained in laboratories. It is therefore recommended during the engineering phase to select and evaluate deck constructions (e.g. steel decks with various deck coverings and top layers) with associated laboratory measured normalized impact sound levels at least 3 db lower than the limit specified in this standard. ---e-n-d---of---g-u-i-d-a-n-c-e---n-o-t-e In order to ensure proper acoustical conditions the following minimum requirements for acoustic absorption coefficient apply: Table 6 Limits for the average sound absorption coefficient for the frequency range 250 Hz to 2 khz Location crn 1 crn 2 crn 3 Workshops Laboratories Control rooms, meeting rooms & offices Dining rooms Coffee bars & recreation rooms Cabins Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 23

24 3 Measurements of area noise levels and acoustical properties 3.1 Measurement standards and guidelines The measurements of area noise levels shall be carried out according to the procedures described in ISO 2923 during a representative operating condition. When the procedure de-scribed in ISO 2923 deviates from any requirements or procedure mentioned in this standard, the requirements in this standard take precedence In areas with particularly high continuous noise levels and/or where pressure releases occurs shall the maximum noise levels be recorded as C-weighted peak sound levels The instrumentation to be used for the noise level measurements must be a Type 1 instrument in compliance with the requirements given in ISO Chapter 2 Section For sound insulation and the average sound absorption testing, equipment as specified in ISO and ISO shall be used for the measurements of airborne and impact sound insulation, respectively. The measurements and analyses shall be carried out by using 1/3-octave bands. The calculation of the airborne sound and impact sound insulation index shall be performed according to the ISO and ISO 717-2, respectively. The average sound absorption coefficients will be calculated based on the measured reverberation times In contradiction to the partition area defined in ISO the partition area used in these evaluations shall be 5 m 2 as a minimum in order to avoid unreasonable low apparent airborne sound insulation index for very small partitions e.g. between corridors and cabins. 3.2 Test programs A test program for the acoustic measurements (noise levels & building acoustic tests) shall be approved prior to the measurements. The test program should at least include the following information: Specification of measuring locations Required operating conditions for the installation Required operating conditions for relevant machinery on board Instrumentation to be used. The test program shall be approved prior to the survey. 3.3 Measurement positions In general, the measuring positions for area noise levels must be selected to give a representative description of the noise situation on board the offshore facility. Higher density of measuring positions may be required in areas near noise sources and in noise sensitive areas. The measurement position shall be indicated in the measurement procedure (see [3.2]) The area noise level limits do not apply closer than 1 m from any noisy equipment or bulkheads/decks or within the skid for larger equipment packages Field measurements of airborne sound insulation and impact sound insulation shall be performed for representative partitions. The reverberation times for calculation of sound absorption coefficients shall be carried out in key locations for which the results may be made applicable also for other rooms (see also [3.2]). Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 24

25 3.4 Amount of test locations For the number of accommodation cabins to be tested for noise, the following may be used as a guide: For installations with less than 50 cabins, noise measurements shall be taken in at least 50% of cabins. For installations with 50 to 100 cabins, noise measurements shall be taken in at least 1/3 of all cabins, but not less than 25 cabins. For installations with more than 100 cabins, noise measurements shall be taken in at least 1/5 of all cabins, but not less than 33 cabins For sound insulation tests, the following may be used as a guide: Airborne sound insulation All type of partitions related to cabins shall be tested, minimum 4 at each deck with cabins. Impact sound insulation Focus shall be given to partitions with hard deck covers in the excitation room and cabins as receiver rooms. Minimum 4 partitions altogether. Chapter 2 Section Measurement requirements For the measurements, the following applies: 1) All noise levels shall be measured as A-weighted overall equivalent noise level 2) Maximum noise levels, where applicable, shall be recorded as C-weighted peak noise level 3) If the specified criterion is exceeded, 1/3-octave band analysis of the noise shall be performed 4) The A-weighted overall equivalent noise level shall be measured over a sufficiently long period of time. In cabins where the noise level does not change with time, 10 sec. is sufficient measurement duration. In working areas where the noise varies with time the measurement should last until the equivalent noise level is close to stationary. 5) When the noise varies during operation, the noise for complete operating cycle shall be measured and the resulting equivalent noise level for a longer period shall be calculated. 3.6 Reporting The report shall comply with the requirements in ISO The noise levels given in dba shall be listed in tables and preferably plotted on general arrangement drawings of the offshore installation. The maximum noise levels given in dbc peak shall for relevant areas be listed in tables. If applicable, the results from the building acoustic measurements shall be presented in the same report Operating condition of relevant machinery such as thrusters, engines, generators, drilling equipment, pumps, turbines, compressors etc. shall be documented. Deviation from the approved operating condition for some of the equipment shall be highlighted If the specified noise criterion is exceeded, the measured noise level shall be provided in 1/3-octave bands. Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 25

26 4 Test conditions 4.1 Introduction The required conditions to be fulfilled during the area noise level measurements are based ISO The major conditions to be fulfilled are described below. When the test conditions described in the referenced ISO standards deviate from any requirements or procedure mentioned in this standard, the requirements in this standard take precedence. The building acoustic tests may preferably be carried out in a quiet installation. 4.2 Preferred operating condition The measurements of the area noise levels shall be performed during normal full production, or simulated normal full production, with all machinery running in representative normal operating condition according to the building specification, or conditions which are agreed between the owner and yard. The rotation speed, pressure, flow etc. shall be according to normal rating of the equipment. Chapter 2 Section If applicable, the noise shall also be tested during transit. In such cases, the power output on the propulsion plant shall correspond to the contractual normal sea going condition, or at least 80% of maximum continuous power available for the propulsion plants. All other machinery like e.g. power generation plant and HVAC systems shall be run at rated capacity Provided the offshore installation is designed to operate on dynamic positioning (DP), the power generation, the thrusters and the necessary production systems must be in operation during the noise measurements. Unless the contracts states otherwise, all thrusters shall be run at minimum 40% of their maximum continuous rating. 4.3 Alternative test procedures and operating condition If noise testing during full production or simulation of full production is not possible, it is allowed to measure the noise impact from one system, or a limited number of systems, at a time. A representative operating condition for the systems under test must be simulated. The measured noise levels for the various systems in operation shall later on be combined to represent simultaneous operation of all relevant systems If acceptable and meaningful operating conditions may be created, it is allowed to measure the noise in one module at a time An approach with noise tests carried out system by system or module by module, shall be approved on case-by-case prior to the test If it is not possible to run the equipment at an representative operating condition during the commissioning or sea trials, the remaining tests may be carried out offshore during the commissioning offshore or shortly after startup. In cases where local authorities are involved this has to be clarified in advance All HVAC systems must be running at balanced rated capacity. Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 26

27 4.4 Environmental conditions The noise measurements in e.g. pontoons or hull when thrusters are in operation shall be conducted in water depth not less than 3 times the draught of the offshore unit The measurements during transit condition, if applicable, shall be taken while travelling straight ahead, i.e. the azimuth at 0 degrees ±2 degrees and minimum rudder action The measurements during DP condition, if applicable, shall be taken with all thrusters intended to be used during these operating conditions operating at approx. 90 degrees azimuth and the vessel moving sideways The wind speed and waves during the measurements shall be sufficiently low in order to avoid significant interference from wind and wave generated noise. Chapter 2 Section The loading condition(s) of the offshore installation is to be as close as possible to normal operating condition(s). The loading condition(s) to be used shall be approved prior to the measurements Any divergence from the above mentioned conditions shall be clearly stated in the report. 4.5 Test areas - State of completion The rooms in the accommodation shall preferably be fully equipped with wall liners, deck covering (carpets, vinyl, etc.), suspended ceilings, curtains, furniture, etc In the working areas, the specified fire, thermal and acoustic insulations shall preferably be in place HVAC and air supply/extract systems for working/process/utility areas shall run at a balanced rated capacity during the tests. Doors and windows are to be closed. Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 27

28 SECTION 3 VIBRATION 1 Vibration limits 1.1 Objective This standard provides requirements for vibrations related to human comfort and working environment on board offshore facilities. The limits are applicable for both vertical and horizontal direction. This standard applies to all spaces on board the offshore unit. The most typical areas are listed in Table 1 below. For areas not included, limits for areas/rooms with a similar need for comfort/ working environment shall be selected. Table 1 Vibration limits with respect to human comfort for offshore units Location 1) 2) 3) Weighted overall vibration velocity [mm/s RMS] Comfort rating number (crn) Chapter 2 Section Cabins Mess / recreation rooms Offices Control rooms Work places ) To be measured vertically and horizontally. 2) Frequency range 1 80 Hz 3) For slender constructions e.g. cranes, helicopter decks etc., see [3.1.4] 1.2 Limitations The requirements described in this section only consider steady-state vibrations, normally caused by harmonic excitation. Requirements for transient vibrations are outside this standard's scope. Some special comments and a guidance note for use in crane cabins are presented in [1.4] below. 1.3 Pedestal constructions High vibration levels in the low frequency range may be experienced in pedestal cranes due to crane manoeuvring like hoisting, luffing and slewing with sudden starts and stops. The resulting self-exciting vibrations in the crane cabins may be significant from a human comfort and a safe crane operation point of view. Low internal damping of a slender pedestal construction may cause the pedestal top to sway horizontally for a long period of time. The same applies to other slender constructions like helicopter decks and constructions with large overhang. Guidance note: The fundamental frequencies for such movements are typically between Hz, while the full frequency range of interest is up to 80 Hz. The corresponding vibrations shall preferably be below the following: Frequency range Hz: Acceleration below m/s 2 RMS Frequency range 1 80 Hz: Velocity below 4.0 mm/s RMS ---e-n-d---of---g-u-i-d-a-n-c-e---n-o-t-e--- Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 28

29 2 Measurements of vibrations 2.1 Measurement standard The measurements shall be carried out according to the procedures described in ISO 6954: When the procedure described in ISO 6954:2000 deviates from any requirements and procedure mentioned in this standard, the requirements in this standard takes precedence The measurements shall be performed with signal processing equipment with the capability to produce both overall vibrations levels and frequency spectra. Where vibrations above the limits are recorded, frequency spectra shall be presented. All other frequency spectra shall be stored and presented upon request. 2.2 Test program A test program shall be approved prior to the measurements. The test program shall at least include the following information: Specification of measuring locations Required operating conditions for machinery items Instrumentation to be used. Chapter 2 Section Selection of measurement positions The measuring positions shall be selected to give a representative description of the vibration situation on board the offshore unit. Higher density of measuring positions may be required in areas near vibration sources and in vibration sensitive areas The number and location of the measuring positions shall be approved prior the vibration survey For offshore units with accommodation areas extended over a large portion of the offshore unit, the measuring positions shall be evenly distributed throughout the decks Vibration measurements in cabins are normally to be taken at the floor in the approximate geometrical centre of the room and shall reflect the vibration of the deck. For larger spaces (such as recreation rooms, messes areas etc.) it may be necessary to distribute a number of measurement positions. 2.4 Number of measurement positions For the measurement of vibrations in different areas applies the following: Accommodation Cabins & Recreation areas: At least 35% of the cabins on each deck level shall be selected for measurements. Working areas / Production areas: The vibrations shall be measured in all relevant areas/rooms. In larger areas/rooms, several measuring positions may be required. The measurement positions shall be concentrated to areas where people normally reside. Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 29

30 2.5 Measurement - units and equipment For the measurements and frequency spectra, the following analysis parameters shall be applied: The measured vibration levels shall be presented as one number representing the overall frequency weighted RMS velocity level. Reference is made to ISO 6954:2000(E) for further details regarding the weighing curve. The measurements shall be executed with equipment and vibration transducers capable of measurements from 1 Hz (0.5 for the pedestal cranes) to 80 Hz with a frequency resolution equal or better than Hz. The frequency spectra shall be generated utilising a window function which gives an accurate estimate of the amplitude value of the single peaks in the frequency spectra, e.g. flat top window. 2.6 Reporting The measurement report for vibrations shall contain the following information: Main particulars of offshore unit, machinery and equipment Loading condition of offshore unit where appropriate Operating condition of relevant machinery such as thrusters, engines, generators, pumps, turbines, compressors etc. Sea and weather conditions (e.g. water depth, significant wave height, wind speed, etc.) Plot plans showing the location of measuring positions and the measuring direction Tables of all measured vibration levels. For results exceeding the criteria, frequency spectra shall be provided Details of type and make of the instrumentation which has been used, including type, window function, averaging time and resolution Calibration certificates of instruments Name of surveying engineer/organisation. Chapter 2 Section Any divergence from the approved test plan shall be stated in the test report Any abnormal activities and/or other conditions which may have influenced the measurements shall be stated in the test report All frequency spectra shall be made available upon request. Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 30

31 3 Test conditions 3.1 Introduction The test conditions for vibrations are equal to the test conditions for noise measurements described in Sec.2 [4]. 3.2 Comments regarding vibration In addition, reference is given to the items described below. The required conditions to be fulfilled during the tests are based on ISO 6954:2000. Major items are listed below. When the test conditions described in the ISO standards deviate from any requirements or procedure mentioned in this standard, the requirements herein take precedence. All decks: Shall be fully equipped with regard to outfit weights. Machinery areas Process/Utility: A full test program shall be carried out with all machinery in normal operation. In principle all rotating machinery which will be running during normal operation condition (such as thrusters, engines, generators, mud pumps, turbines, compressors etc.) shall preferably be in operation during the tests. Chapter 2 Section 3 Guidance note: However, it may be difficult to have all necessary equipment running simultaneously during the commissioning phase. Hence, where practical and technical feasible the vibration response may be measured area by area with only the relevant and dominating systems/ equipment for the particular area of interest in operation. For operating conditions and further details Sec.2 [4] applies. ---e-n-d---of---g-u-i-d-a-n-c-e---n-o-t-e--- Drilling areas: If there is drilling equipment on board available for operation, this equipment shall be running during the measurements. Otherwise, vibration tests of drilling and other specialised equipment must be tested after start-up. Ventilation: HVAC systems shall be running at a normal balanced rated capacity during the tests. Dynamic positioning and heading control: The operating condition shall correspond to a power such as to maintain a stable position/optimum heading during normal operating condition of the offshore unit. If not otherwise stated in the building specification this condition shall be represented by a simulated DP condition/heading control with at least 40% power on all thrusters intended to be used during these operating conditions. Transit: For offshore units intended to be in transit for longer periods, the test program shall include a normal transit condition correspond to the contractual condition, or at least 80% of maximum available power on each of the main propulsion propellers. All other machinery like e.g. power generation plant and HVAC systems shall be run at rated capacity. Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 31

32 SECTION 4 ILLUMINATION 1 Area light limits 1.1 Objective The light condition offshore is of great importance to the personnel on board for carrying out their daily tasks with the expected precision and speed without being exhausted. This standard gives requirements for the light in various areas based on recognized standards. This standard applies to all spaces on board offshore facilities. The most typical areas are listed in Table 1 below. For areas not specifically mentioned, limits for areas/rooms with a similar need for comfort/ working environment shall be selected. 1.2 Limitations The requirements described in this document shall be met during the normal operating condition of the offshore facility. Hence, the emergency lighting is not part of this standard since it is fully covered by SOLAS and the MODU code. Chapter 2 Section Illumination limits Various standards and rules involving lighting are quite similar, and no justification is found for more than one set of criteria for the lighting on board. The illumination limits given in Table 1 applies for comfort rating 1 and 2. The lighting condition on board offshore installations with comfort rating 3 is not evaluated according to this offshore standard For areas not included in Table 1 limits for areas/rooms with a similar need for lighting shall be selected. Table 1 Illumination limits for the various types of areas on board offshore units for crn 1 & 2 1) Location Maintained illumination over the areas/rooms [Em, lux] Minimum illumination uniformity areas/ rooms, U 0 6) Maintained illumination over the Task Area [Em, lux] Process and utility modules: General lighting 2),3) Lay down & muster area External/outdoor walk- & access ways 4) Indoor stairs, lifts & walkways in enclosed areas 4) Local equipment and instrument rooms Workshops, laboratory, offices Coffee bars outside LQ Crane cabins 400 Adjustable Adjustable Local control room Central control room 5) 500 Adjustable Adjustable Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 32

33 Location Drilling modules: Maintained illumination over the areas/rooms [Em, lux] Minimum illumination uniformity areas/rooms U 0 6) Maintained illumination over the Task Area [Em, lux] General lighting 2),3) Drillers cabin, local control rooms, operator cabins 500 Adjustable Adjustable Mud lab Drill floor & monkey board Shale shaker, slurry & cuttings areas Chapter 2 Section 4 Pipe rack area Accommodation spaces: Techn. rooms / electro rooms, HVAC Corridors Cabins 3) 150+reading (750) Galley, cold & warm kitchen, prep. area Offices, meeting & conf. room, library, reading & traffic control 500 Adjustable Adjustable Hospital/ward Telecom & radio equip. room Recreation rooms/lounges/coffee Bars Change room, Toilets (500) 1) For compliance with NORSOK S-002 some minor adjustments may be needed. These shall be considered on a caseby-case basis. 2) The general lighting requirement applies to, but is not limited to, areas like general process & utility areas, machine rooms and electrical rooms etc. 3) The illumination in the immediate surrounding areas of the task areas shall not be less than one step down the preferred scale of illumination as presented in EN , paragraph ) In stairs and walkways it is important to have proper lighting at the steps and deck. See chapter ) For the central control room special requirements apply, ref. ISO ) In general the illumination uniformity (U 0) must be increased if compliance with NORSOK is requested. 1.4 Preliminary analysis A preliminary analysis of illumination levels and conditions in working and living areas on board an offshore installation shall be prepared during the design phase. The illumination shall be analysed especially in the control room, cabins and other rooms where work with high visual demands takes place, where display screen equipment is used and where the work requires good visibility during various weather conditions. Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 33

34 1.4.2 A maintenance factor for lighting calculations shall be used. For the maintenance factor reference is given to CIE EN Application of the limits The level of illumination listed in Table 1 refers to the room/area and applies 0.75 m above deck in the working and living areas. In corridors and in staircases the illumination limit refers to the floor level. Of practical reasons the control measurements may be carried out at a height in the range m above the deck/steps. 1.6 Task lighting In rooms with obvious task areas like desks in offices and work bench in workshops, the illumination in the task areas shall have extra, possibly manually operated, lights which may increase the illumination in the task area at least one step up in the preferred scale of illumination as presented in standard EN (Paragraph 4.3.2). For guides to the illumination of task areas in general, reference is given to the standard EN The same applies to workplaces in working areas that require daily access and/or detailed reading of information, or is critical from a safety point of view. This includes gauges, indicators, areas that need to be checked for leakage and areas that frequently need maintenance. Summed up, task lighting shall be increased as indicated in EN in areas where: visual work is critical errors are costly to rectify accuracy or higher productivity is of great importance the visual capacity of the worker is below normal visual task details are of unusually small size or low contrast the visual task goes on for an unusually long time. General task lighting values are given in Table 1. Chapter 2 Section Design The lighting design shall focus on: Avoiding shadows Avoiding direct glare 1.8 Areas not covered The level of illumination and correlated colour temperature on the Navigation Bridge and similar applicable areas with charts and instruments with significant for the maritime activities are not covered by this standard, but shall be according to relevant requirements/guidelines from IMO, SOLAS, etc. 1.9 LED lights LED lights are becoming more and more popular. The objective with this standard is to ensure proper lighting on board, and shall be in line with the specifications given in Table 1. However, well documented deviations will be accepted for some cases where LED lights are used. This because LED lights tends to have lower Luxvalues for the same perceived illumination level compared to conventional lighting. Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 34

35 2 Measurements of the lighting 2.1 Measurements The measurements of the illumination shall be carried out according to the procedures described in DIN : When the procedure de-scribed in DIN : deviates from any requirements or procedure mentioned in this standard, the requirements in this standard take precedence Lighting parameters subject to verification through measurements are: Illumination Illumination uniformity The instrumentation to be used for the light measurements shall comply with DIN class B requirements or similar standards. Chapter 2 Section Test program, -location and number of measurements A test program shall be approved prior to the measurements. The test program shall at least include the following information: Specification of measuring locations (rooms, areas) An estimation of number of measurement locations within each room/area, i.e. measurement grid definition The lighting during the tests Instrumentation to be used. Guidance note: A guide to the number of measurement locations (grid) evenly distributed in each room/area (including task areas) for general lighting is as given in Table 2 and Table 3 below: Table 2 Number of measurement positions within the room/area as a function of room size Location area Number of measurement locations <15 m < area (in m 2 ) < 150m 2 >150 m 2 16 Table 3 Selection of measurement positions within the various rooms/areas Type of room/area Distance between measurements Corridors <10m General Process and Utility Areas To be decided on site, but focus shall be given to marked walkways and task areas ---e-n-d---of---g-u-i-d-a-n-c-e---n-o-t-e For cabins with equal design minimum one cabin of each design shall be measured. Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 35

36 2.2.3 A separate reading shall be taken at the centre or most important location of each task area. 2.3 Measurements In general, the measuring positions shall be selected to give a representative description of the lighting conditions on board the offshore facility. The following may be stated: Higher density of measuring positions may be required in light sensitive areas and in areas with task lighting. Light measurements shall be conducted both for the general lighting as well as for the task areas Other details regarding measurement procedure shall be prepared and carried out in accordance with DIN and DIN standards, depending on primary light source type The light measurements shall be taken at the following heights: General lighting 0.75m above the deck Task area lighting at task surface height Corridors/staircase preferably at deck level or at least not higher than 0.20 m. Chapter 2 Section The light readings shall be taken in the horizontal plane with the sensor facing upwards. 3 Test conditions 3.1 Light measurements The light measurements shall be performed during normal lighting condition on board the offshore installation without contributions from stray lights. All major components/furniture shall be in place at the time of the control measurements The measurements shall be carried out with all lighting appliances in operation and in accordance with DIN : Stray light Unintentional stray light shall be avoided during the measurements. This may be obtained by utilizing the below listed measures: Sunlight may be avoided by measurements during night times Light from ship yards/onshore plants shall be avoided in the case of testing during night time if the installation is still at the yard Doors between rooms which normally are closed, shall be shut. 3.3 Light from adjacent areas Light transmitted through openings or glass fields in internal partitions are not considered as unintentional stray light. Hence, light through internal glass walls/windows from the adjacent rooms are considered a part of the design and shall be included in the light measurements. Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 36

37 SECTION 5 INDOOR CLIMATE 1 Requirements for the on board climate 1.1 Introduction This standard for the indoor climate outline standards, conventions, guidelines and specifications for the purpose of categorization of the on board climate for an offshore facility in relation to the performance of the on board heat, ventilation, and air conditioning (HVAC) plant at the typical ambient climatic conditions to which the offshore unit will be subjected during its intended use This standard applies only to the indoor occupancy zone as specified in Table 1. Open areas and in hazardous process rooms/areas the requirement to air change and ventilation are commanded by safety requirements. Chapter 2 Section When setting the limits to the climate parameters, and determining the measuring procedure, due consideration has been given to technical and practical limitations inherent in the design and construction of different types of offshore facilities and localities This standard gives requirements for indoor climate related to comfort and working environment on board an offshore facility. The requirements apply to the spaces specified in Table With the specified climate comfort for the rooms, the majority of the offshore crew can safely and comfortably perform the necessary activities over a prolonged period of time, for which the room is intended for. The design shall ensure that each individual room achieves an adequate indoor climate with respect to air quality, air demand, draught and temperature Compliance with the requirements shall be verified through documentation and measurements. 1.2 Classification of spaces on board The standard applies to the designated accommodation spaces and working areas sensitive to the climate on board the offshore facility classified as shown in Table 1. Table 1 Classification of accommodation spaces & comfort sensitive areas outside LQ Room class Type A Type B Type C Type D Type E Accommodation space Cabins Hospital and ward rooms Central control room, offices, conference rooms, libraries, recreation rooms Dining areas, gymnasiums, auditorium, cinema Workshops, laboratories, offices in working areas, local control rooms, coffee bars outside LQ Guidance note: Piping and equipment for drilling and drilling related auxiliary systems are addressed in DNVGL-OS-E101. Piping and equipment for hydrocarbon production and production related auxiliary systems are addressed in DNVGL-OS-E e-n-d---of---g-u-i-d-a-n-c-e---n-o-t-e--- Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 37

38 1.2.2 In each designated space it shall be possible to change from the lower to the higher temperature as given in Table 2 within two hours. However for special areas, this temperature control span time criterion may be evaluated separately. 1.3 Limit values The requirements to air properties and quality at different localities and comfort standard are shown in Table 2. Table 2 Air properties and quality at different localities and comfort standard Designated space type Comfort rating number crn Minimum air temperature control span 1) 15 C and below (outside) 40 C and above (outside) Maximum air velocity Minimum fresh air supply quantity per person2) Vertical air temperature difference 4) Relative humidity -RH 3) Chapter 2 Section 5 Min./Max. limit ( C) Min./Max. limit ( C) m/s litres/s m 3 /hour C % A to to to to ) ) to to to to < 65 B to to to to ) ) to to to to < 65 C to to to to ) ) to to to to < 65 D to to to to ) ) to to to to < 65 E to to to to ) ) to to to to < 65 1) For outside temperatures between 15 C and 40 C, the control span is to comply with the graphs shown in Figure 1, Figure 2 and Figure 3. 2) Unless otherwise specified by owner and yard the number of persons in each designated space will be counted according to ISO ) Any relative humidity is to be within the range for all outdoor conditions the HVAC system is designed for. 4) Vertical air temperature difference is normally tested for the low temperature condition only 5) For NORSOK a minimum air supply of 7 l/s per person plus 2.0 l/s per m 2 of the room is indicated. However, this shall be evaluated in each case. Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 38

39 Chapter 2 Section 5 Figure 1 Temperature control span, designated space type A and B Figure 2 Temperature control span, designated space type C and D Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 39

40 Chapter 2 Section 5 Figure 3 Temperature control span, designated space type E 1.4 Required regulation For crn 1: Individual and automatic room temperature control (with thermostat) of all the five designated spaces types A, B, C, D & E) are required. For crn 2 and 3: Individual room temperature control of designated all the five designated spaces types A, B, C, D & E) are required Air inlets shall be located in the open air and in areas not contaminated by exhaust outlets. 1.5 NORSOK Compliance For compliance to NORSOK S-002: Recycling of air shall preferably be avoided Materials containing synthetic mineral fibres that are used in the living quarters or in permanently manned areas shall be fully sealed Areas where smoking is allowed shall be separated from non-smoking areas by a physical partition or an equally effective ventilation control Carpeted floor shall be avoided. Offshore standards, DNVGL-OS-A301. Edition April 2016 Page 40