Annex 1 Resolution Msc 337 91 Adopted On 30 November -Books Pdf

ANNEX 1 RESOLUTION MSC 337 91 adopted on 30 November
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MSC 91 22 Add 1,Annex 1 page 2,CODE ON NOISE LEVELS ON BOARD SHIPS. CHAPTER 1 GENERAL,1 2 Purpose,1 3 Application,1 4 Definitions. CHAPTER 2 MEASURING EQUIPMENT,2 1 Equipment specifications. 2 2 Use of equipment,CHAPTER 3 MEASUREMENT,3 1 General. 3 2 Personnel requirements,3 3 Operating conditions at sea trials.
3 4 Operating conditions in port,3 5 Environmental conditions. 3 6 Measurement procedures,3 7 Determination of noise exposure. 3 8 Calibration,3 9 Measurement uncertainties,3 10 Points of measurement. 3 11 Measurements in machinery spaces,3 12 Measurements in navigation spaces. 3 13 Measurements in accommodation spaces,3 14 Measurements in normally unoccupied spaces.
CHAPTER 4 MAXIMUM ACCEPTABLE SOUND PRESSURE LEVELS. 4 1 General,4 2 Noise level limits,4 3 Survey report. CHAPTER 5 NOISE EXPOSURE LIMITS,5 1 General, 5 2 Conservation of hearing and use of hearing protectors. 5 3 Limits of exposure of seafarers to high noise levels. 5 4 24 hour equivalent continuous sound level limit. 5 5 Hearing conservation programme, CHAPTER 6 ACOUSTIC INSULATION BETWEEN ACCOMMODATION SPACES. 6 1 General,6 2 Sound insulation index,6 3 Erection of materials. CHAPTER 7 HEARING PROTECTION AND WARNING INFORMATION. 7 1 General,7 2 Requirements for hearing protectors.
7 3 Selection and use of hearing protectors,7 4 Warning notices. I MSC 91 22 Add 1 doc,MSC 91 22 Add 1,Annex 1 page 3. APPENDIX 1 FORMAT FOR NOISE SURVEY REPORT, APPENDIX 2 GUIDANCE ON THE INCLUSION OF NOISE ISSUES IN SAFETY. MANAGEMENT SYSTEMS,APPENDIX 3 SUGGESTED METHODS OF ATTENUATING NOISE. APPENDIX 4 SIMPLIFIED PROCEDURE FOR DETERMINING NOISE EXPOSURE. I MSC 91 22 Add 1 doc,MSC 91 22 Add 1,Annex 1 page 4.
1 The Code on noise levels on board ships hereinafter referred to as the Code has. been developed to provide international standards for protection against noise regulated by. regulation II 1 3 12 of the International Convention for the Safety of Life at Sea SOLAS 1974. as amended Although the Code is legally treated as a mandatory instrument under the. SOLAS Convention certain provisions of the Code remain recommendatory or informative. see paragraph 1 1 3, 2 These regulations recommendations and advice are intended to provide. Administrations with the tools to promote hearing saving environments on board ships. This is however a dynamic topic dealing with the human and technical environments in which. they interface Rules and recommendations will necessarily evolve on a case by case basis. as a result of various technological as well as safety management practice developments. For this reason Administrations are encouraged to pass on experience and information. received from recognized organizations ship operators and equipment designers to improve. 3 The Code has been developed having regard to conventional passenger and cargo. ships While certain types and sizes of ships have been excluded from its application it. should be recognized that full application to ships which differ appreciably from the. conventional types of ships regarding design or operations might need specific consideration. 4 The Organization adopted a Recommendation on methods of measuring noise. levels at listening posts resolution A 343 IX which this Code is not intended to supersede. That Recommendation relates to interference by shipborne noise with the proper reception of. external audible navigation signals and although the methods of measuring noise levels in. accordance with the Recommendation and with the Code differ these documents are to be. considered compatible inasmuch as this Code is concerned primarily with the effect of noise. on health and comfort Care will be needed to ensure that there is compatibility between the. general requirements and the requirements for audibility of navigation signals. I MSC 91 22 Add 1 doc,MSC 91 22 Add 1,Annex 1 page 5. CHAPTER 1 GENERAL, 1 1 1 The Code is intended to provide standards to prevent the occurrence of potentially. hazardous noise levels on board ships and to provide standards for an acceptable. environment for seafarers These standards were developed to address passenger and. cargo ships Since some sizes and certain service types of ships have been exempted from. these requirements it should be recognized that full application of the Code to ships that. differ appreciably from conventional ships will require special considerations The Code is. intended to provide the basis for a design standard with compliance based on the. satisfactory conclusion of sea trials that result in issuance of a Noise Survey Report. Ongoing operational compliance is predicated on the crew being trained in the principles of. personal protection and maintenance of mitigation measures These would be enforced. under the dynamic processes and practices put in place under SOLAS chapter IX. 1 1 2 Requirements and recommendations are made for. 1 measurement of noise levels and exposure, 2 protecting the seafarer from the risk of noise induced hearing loss under. conditions where at present it is not feasible to limit the noise to a level. which is not potentially harmful, 3 limits on acceptable maximum noise levels for all spaces to which seafarers.
normally have access and, 4 verification of acoustic insulation between accommodation spaces. 1 1 3 Although this Code is legally treated as a mandatory instrument under the SOLAS. Convention the following provisions of this Code remain recommendatory options for. compliance or informative in nature,Paragraphs 1 3 2 and 1 3 3. Paragraphs 3 4 2 and 3 4 3,Section 6 3,Section 7 3. Appendix 2,Appendix 3,Appendix 4,1 2 Purpose, The purpose of the Code is to limit noise levels and to reduce seafarers exposure to noise. in order to, 1 provide for safe working conditions by giving consideration to the need for.
speech communication and for hearing audible alarms and to an. environment where clear headed decisions can be made in control stations. navigation and radio spaces and manned machinery spaces. 2 protect the seafarer from excessive noise levels which may give rise to a. noise induced hearing loss and,I MSC 91 22 Add 1 doc. MSC 91 22 Add 1,Annex 1 page 6, 3 provide the seafarer with an acceptable degree of comfort in rest. recreation and other spaces and also provide conditions for recuperation. from the effects of exposure to high noise levels,1 3 Application. 1 3 1 The Code applies to new ships of a gross tonnage of 1 600 and above. 1 3 2 The specific provisions relating to potentially hazardous noise levels mitigation and. personal protective gear contained in the Code may be applied to existing ships of a gross. tonnage of 1 600 and above as far as reasonable and practical to the satisfaction of the. Administration, 1 3 3 The Code may be applied to new ships of a gross tonnage of less than 1 600 as far. as reasonable and practical to the satisfaction of the Administration. 1 3 4 The Code does not apply to,1 dynamically supported craft.
2 high speed craft,3 fishing vessels,4 pipe laying barges. 5 crane barges,6 mobile offshore drilling units,7 pleasure yachts not engaged in trade. 8 ships of war and troopships,9 ships not propelled by mechanical means. 10 pile driving vessels and,11 dredgers, 1 3 5 The Code applies to ships in port or at sea with seafarers on board. 1 3 6 Dispensations from certain requirements may in special circumstances be granted. by the Administration if it is documented that compliance will not be possible despite. relevant and reasonable technical noise reduction measures Such dispensation shall not. include cabins unless exceptional circumstances prevail If dispensation is granted it shall. be ensured that the goal of this Code is achieved and the noise exposure limits shall be. considered in conjunction with chapter 5, 1 3 7 For ships designed for and employed on voyages of short duration or on other.
services involving short periods of operation of the ship to the satisfaction of the. Administration paragraphs 4 2 3 and 4 2 4 may be applied only with the ship in the port. condition provided that the periods under such conditions are adequate for seafarers rest. and recreation,I MSC 91 22 Add 1 doc,MSC 91 22 Add 1. Annex 1 page 7, 1 3 8 The Code is not intended to apply to passenger cabins and other passenger spaces. except in so far as they are work spaces and are covered by the provisions of the Code. 1 3 9 In case of repairs alterations and modifications of a major character and outfitting. related thereto of existing ships it shall be ensured that areas in which changes have been. made meet the requirements of this Code for new ships insofar as the Administration. deems reasonable and practicable, 1 3 10 The Code covers only noise sources related to the ship such as machinery and. propulsion but does not include wind wave ice noise alarms public address systems etc. 1 4 Definitions, For the purpose of the Code the following definitions apply Additional definitions are given. elsewhere in the Code, 1 4 1 Accommodation spaces Cabins offices for carrying out ship s business hospitals.
messrooms recreation rooms such as lounges smoke rooms cinemas gymnasiums. libraries and hobbies and games rooms and open recreation areas to be used by seafarers. 1 4 2 Apparent weighted sound reduction index R w A single number value expressed in. decibels dB which describes the overall sound insulation performance in situ of walls doors. or floors provides see ISO 717 1 1996 as amended by 1 2006. 1 4 3 A weighted equivalent continuous sound level LAeq T A weighted sound pressure. level of a continuous steady sound that within a measurement time interval T has the same. mean square sound pressure as a sound under consideration which varies with time. It is expressed in decibels A dB A and is given by the following equation. where T measurement time,pa t A weighted instantaneous sound pressure. po 20 Pa the reference level, 1 4 4 A weighted sound pressure level or noise level The quantity measured by a sound. level meter in which the frequency response is weighted according to the A weighting curve. see IEC 61672 1, 1 4 5 C weighted equivalent continuous sound level LCeq T C weighted sound pressure. level of a continuous steady sound that within a measurement time interval T has the same. mean square sound pressure as a sound under consideration which varies with time. It is expressed in decibels C dB C and is given by the following equation. where T measurement time,pc t C weighted instantaneous sound pressure. po 20 Pa the reference level,I MSC 91 22 Add 1 doc.
MSC 91 22 Add 1,Annex 1 page 8, 1 4 6 C weighted peak sound level LCpeak C weighted maximum instantaneous sound. pressure level It is expressed in decibels C dB C and is given by the following equation. where ppeak C weighted maximum instantaneous sound pressure. po 20 Pa the reference level, 1 4 7 C weighted sound pressure level or noise level The quantity measured by a sound. level meter in which the frequency response is weighted according to the C weighting curve. see IEC 61672 1 2002 05, 1 4 8 Continuously manned spaces Spaces in which the continuous or prolonged. presence of seafarers is necessary for normal operational periods. 1 4 9 Crane barge A vessel with permanently installed cranes designed principally for. lifting operations, 1 4 10 Daily noise exposure level Lex 24h represents the equivalent noise exposure level. for a period of 24 hours,Lex 24h LAeq T 10 log T T0.
where T is the effective duration on board,T0 is the reference duration 24 h. The total equivalent continuous A weighted sound pressure level LAeq T shall be calculated. by using the different noise levels LAeq Ti and associated time periods with the following. Lex 24h LAeq 24h when seafarers are on board over a period of 24 hours. 1 4 11 Dredger A vessel undertaking operations to excavate bottom sediment where the. vessel has permanently installed excavation equipment. 1 4 12 Duty stations Those spaces in which the main navigating equipment the ship s. radio or the emergency source of power are located or where the fire recording or fire control. equipment is centralized and also those spaces used for galleys main pantries stores. except isolated pantries and lockers mail and specie rooms workshops other than those. forming part of the machinery spaces and similar such spaces. I MSC 91 22 Add 1 doc,MSC 91 22 Add 1,Annex 1 page 9. 1 4 13 Dynamically supported craft A craft which is operable on or above water and which. has characteristics different from those of conventional displacement ships Within the. aforementioned generality a craft which complies with either of the following characteristics. 1 the weight or a significant part thereof is balanced in one mode of. operation by other than hydrostatic forces, 2 the craft is able to operate at speeds such that the function is equal to or. greater than 0 9 where v is the maximum speed L is the water line. length and g is the acceleration due to gravity all in consistent units. 1 4 14 Existing ship A ship which is not a new ship. 1 4 15 Fishing vessel A vessel used commercially for catching fish whales seals walrus. or other living resources of the sea, 1 4 16 Hearing loss Hearing loss is evaluated in relation to a reference auditory threshold. defined conventionally in ISO Standard 389 1 1998 The hearing loss corresponds to the. difference between the auditory threshold of the subject being examined and the reference. auditory threshold, 1 4 17 Hearing protector A device worn to reduce the level of noise reaching the ears.
Passive noise cancelling headsets block noise from reaching the ear Active. noise cancelling headphones generate a signal that cancels out the ambient noise within the. 1 4 18 Integrating sound level meter A sound level meter designed or adapted to measure. the level of the mean squared time averaged A weighted and C weighted sound pressure. 1 4 19 Machinery spaces Any space which contains steam or internal combustion. machinery pumps air compressors boilers oil fuel units major electrical machinery. oil filling stations thrusters refrigerating stabilizing steering gear ventilation and. air conditioning machinery etc and trunks to such spaces. 1 4 20 Mobile offshore drilling unit A vessel capable of engaging in drilling operations for. the exploration for or exploitation of resources beneath the seabed such as liquid or. gaseous hydrocarbons sulphur or salt, 1 4 21 Navigating bridge wings Those parts of the ship s navigating bridge extending. towards the ship s sides, 1 4 22 New ship means a ship to which this Code applies in accordance with SOLAS. regulation II 1 3 12 1, 1 4 23 Noise For the purpose of the Code all sound which can result in hearing. impairment or which can be harmful to health or be otherwise dangerous or disruptive. 1 4 24 Noise induced hearing loss A hearing loss originating in the nerve cells within the. cochlea attributable to the effects of sound, 1 4 25 Noise level See A weighted sound pressure level paragraph 1 4 4. I MSC 91 22 Add 1 doc,MSC 91 22 Add 1,Annex 1 page 10.
1 4 26 Occasional exposures Those exposures typically occurring once per week or less. frequently, 1 4 27 Pile driving vessel A vessel undertaking operations to install pilings in the seabed. 1 4 28 Pipe laying barge A vessel specifically constructed for or used in conjunction with. operations associated with the laying of submarine pipelines. 1 4 29 Port condition The condition in which all machinery solely required for propulsion is. 1 4 30 Potentially hazardous noise levels Those levels at and above which persons. exposed to them without protection are at risk of sustaining a noise induced hearing loss. 1 4 31 Repairs alterations and modifications of a major character means a conversion of a. ship which substantially alters the dimensions carrying capacity or engine power of the ship. which change type of the ship which otherwise so alters the ship that if it were a new ship. it would become subject to the relevant provisions. 1 4 32 Sound Energy that is transmitted by pressure waves in air or other materials and is. the objective cause of the sensation of hearing, 1 4 33 Sound pressure level Lp or SPL Sound pressure level expressed in decibel dB. of a sound or noise given by the following equation. where p sound pressure in Pascal,po 20 Pa the reference level. 1 4 34 Voyages of short duration Voyages where the ship is not generally underway for. periods long enough for seafarers to require sleep or long off duty periods during the. 1 4 35 Weighted sound reduction index Rw A single number value expressed in. decibels dB which describes the overall sound insulation performance in laboratory of. walls doors or floors provides see ISO 717 1 1997 as amended by 1 2006. CHAPTER 2 MEASURING EQUIPMENT,2 1 Equipment specifications. 2 1 1 Sound level meters, Measurement of sound pressure levels shall be carried out using precision integrating sound.
level meters subject to the requirements of this chapter Such meters shall be manufactured. to IEC 61672 1 2002 05 1 type class 1 standard as applicable or to an equivalent standard. acceptable to the Administration2,Recommendation for sound level meters. Sound level meters class type 1 manufactured according to IEC 651 IEC 804 may be used. until 1 July 2016,I MSC 91 22 Add 1 doc,MSC 91 22 Add 1. Annex 1 page 11,2 1 2 Octave filter set, When used alone or in conjunction with a sound level meter as appropriate an octave filter. set shall conform to IEC 61260 1995 3 or an equivalent standard acceptable to the. Administration,2 2 Use of equipment,2 2 1 Calibration. Sound calibrators shall comply with the standard IEC 60942 2003 01 and shall be approved. by the manufacturer of the sound level meter used, 2 2 2 Check of measuring instrument and calibrator.
Calibrator and sound level meter shall be verified at least every two years by a national. standard laboratory or a competent laboratory accredited according to ISO 17025 2005 as. corrected by Cor 1 2006,2 2 3 Microphone wind screen. A microphone wind screen shall be used when taking readings outside e g on navigating. bridge wings or on deck and below deck where there is any substantial air movement. The wind screen should not affect the measurement level of similar sounds by more. than 0 5 dB A in no wind conditions,CHAPTER 3 MEASUREMENT. 3 1 General, 3 1 1 On completion of the construction of the ship or as soon as practicable thereafter. measurement of noise levels in all spaces specified in chapter 4 shall take place under the. operating conditions specified in sections 3 3 and 3 4 and shall be suitably recorded as. required by section 4 3, 3 1 2 Measurements of the A weighted equivalent continuous sound level LAeq T shall be. made for the purpose of ensuring compliance with chapter 4. 3 1 3 Measurements of the C weighted equivalent continuous sound level LCeq T and the. C weighted peak sound level LCpeak shall be made in spaces where LAeq T exceeds 85 dB A. for the purpose of determining appropriate hearing protection according to the HML method. see chapter 7 and appendix 2,3 2 Personnel requirements.
3 2 1 In order to ensure an acceptable and comparable quality of the measurement. results and the reports the measuring institutes or experts shall prove their competence with. view to noise measurements,Octave band and fractional octave band filters. I MSC 91 22 Add 1 doc,MSC 91 22 Add 1,Annex 1 page 12. 3 2 2 This person conducting measurements shall have4. 1 knowledge in the field of noise sound measurements and handling of used. 2 training concerning the procedures specified in this Code. 3 3 Operating conditions at sea trials, 3 3 1 Measurements should be taken with the ship in the loaded or ballast condition. The course of the ship shall be as straight as possible The actual conditions during the. measurements shall be recorded on the survey report. 3 3 2 Noise measurements shall be taken at normal service speed and unless otherwise. addressed in the provisions below no less than 80 of the maximum continuous rating. MCR Controllable pitch and Voith Schneider propellers if any shall be in the normal. seagoing position For special ship types and for ships with special propulsion and power. configurations such as diesel electric systems the Administration may in cooperation with. the shipyard and shipowners give due consideration to actual ship design or operating. parameters when applying the requirements of paragraphs 3 3 1 and 3 3 2. 3 3 3 All machinery navigation instruments radio and radar sets etc normally in use at. normal seagoing condition and levels including squelch shall operate throughout the. measurement period However neither energized fog signals nor helicopter operations shall. take place during the taking of these measurements. 3 3 4 Measurements in spaces containing emergency diesel engine driven generators fire. pumps or other emergency equipment that would normally be run only in emergency or for. test purposes shall be taken with the equipment operating Measurements are not intended. for determining compliance with maximum noise level limits but as a reference for personal. protection of seafarers carrying out maintenance repair and test activities in such spaces. 3 3 5 Mechanical ventilation heating and air conditioning equipment shall be in normal. operation taking into account that the capacity shall be in accordance with the design. conditions, 3 3 6 Doors and windows should in general be closed. 3 3 7 Spaces should be furnished with all necessary equipment Measurements without. soft furnishings may be taken but no allowance should be made for their absence Rechecks. or follow up readings may be taken with soft furnishings included. 3 3 8 Ships fitted with bow thrusters stabilizers etc may be subject to high noise levels. when this machinery is in operation For thrusters measurements shall be made at 40. thruster power and the ship s speed shall be appropriate for thruster operation. Measurements shall be taken at positions around such machinery when in operation and in. adjacent accommodation spaces and duty stations If such equipment is intended for. continuous operation e g stabilizers measurements shall be made for ensuring compliance. with chapter 4 If such systems are intended for short temporary use only for instance. during port manoeuvres measurements are only relevant for ensuring compliance with. chapter 5 on noise exposure, Testing institutions which support a quality management system according to ISO 17020 25 are.
considered to fulfil these requirements,I MSC 91 22 Add 1 doc. MSC 91 22 Add 1,Annex 1 page 13, 3 3 9 In case of ships with Dynamical Positioning DP which is intended for use in. normal working condition additional noise measurements at DP mode shall be made at. control stations duty stations and accommodation spaces to ensure that the maximum. noise level limits in these spaces are not exceeded The Administration classification. societies shipyard and DP designers as appropriate shall agree on a process to simulate. the operation of the DP thruster system under conditions which would approximate. station holding at or above 40 per cent of maximum thruster power for design environmental. conditions that the ship operates in,3 4 Operating conditions in port. 3 4 1 Measurements as specified in paragraphs 3 4 2 3 4 3 and 3 4 4 relate to the ship in. port condition, 3 4 2 When the noise from the ship s cargo handling equipment may lead to noise above. maximum levels in duty stations and accommodation spaces affected by its operation. measurements should be taken Noise originating from sources external to the ship should. be discounted as indicated in paragraph 3 5 3, 3 4 3 Where the ship is a vehicle carrier and noise during loading and discharging.
originates from vehicles the noise level in the cargo spaces and the duration of the exposure. should be considered in conjunction with chapter 5 Such noise levels originating from. vehicles may be estimated theoretically by the shipyard and shipowners in cooperation with. the Administration, 3 4 4 Measurements shall be taken in machinery spaces with the machinery operating in. the port condition if the provisions of paragraph 5 3 5 in respect of hearing protection shall be. met in lieu of the provisions of paragraph 4 2 1 during maintenance overhaul or similar port. conditions,3 5 Environmental conditions, 3 5 1 The readings obtained may be affected if the water depth is less than five times the. draught or if there are large reflecting surfaces in the ship s vicinity Such conditions shall. therefore be noted in the noise survey report, 3 5 2 The meteorological conditions such as wind and rain as well as sea state should. be such that they do not influence the measurements Wind force 4 and 1 m wave height. should not be exceeded If this cannot be achieved the actual conditions shall be reported. 3 5 3 Care shall be taken to see that noise from extraneous sound sources such as. people entertainment construction and repair work does not influence the noise level on. board the ship at the positions of measurement If necessary measured values may be. corrected for steady state background noise according to the energy summation principle. 3 6 Measurement procedures, 3 6 1 During noise level measurement only seafarers necessary for the operation of the. ship and persons taking the measurements shall be present in the space concerned. 3 6 2 Sound pressure level readings shall be taken in decibels using an A weighting. dB A and C weighting dB C filter and if necessary also in octave bands between 31 5. and 8 000 Hz,I MSC 91 22 Add 1 doc,MSC 91 22 Add 1.
Annex 1 page 14, 3 6 3 The noise level measurements shall be taken with the integrating sound level meter. using spatial averaging as described in paragraph 3 13 1 and over a time period until stable. readings are found or at least 15 s in order to represent the average value from variations. due to irregular operation or variations in the sound field Readings shall be made only to the. nearest decibel If first decimal of the dB reading is 5 or higher the reading shall be made to. nearest higher integer,3 7 Determination of noise exposure. In addition to the continuous sound level measurements the noise exposure level of seafarers. see chapter 5 shall be determined based upon ISO 9612 2009 A simplified procedure based. on ISO 9612 and a work place related noise exposure is given in appendix 4. 3 8 Calibration, The sound level meter shall be calibrated with the calibrator referred to in paragraph 2 2 1. before and after measurements are taken,3 9 Measurement uncertainties. The uncertainty of measurements on board vessels depends on several factors for example. measurement techniques and environmental conditions Measurements made in conformity. with this Code with few exceptions results in reproducibility standard deviation of the. equivalent continuous A weighted sound pressure level equal to or less than 1 5 dB. 3 10 Points of measurement,3 10 1 Measurement positions.
If not otherwise stated measurements shall be taken with the microphone at a height of. between 1 2 m seated person and 1 6 m standing person from the deck The distance. between two measurement points should be at least 2 m and in large spaces not containing. machinery measurements should be taken at intervals not greater than 10 m throughout the. space including positions of maximum noise level In no case shall measurements be taken. closer than 0 5 m from the boundaries of a space The microphone positions shall be as. specified in paragraphs 3 10 3 and sections 3 11 to 3 14 Measurements shall be taken at. positions where the personnel work including at communication stations. 3 10 2 Duty stations, The noise level shall be measured at all points where the work is carried out Additional. measurements shall be performed in spaces containing duty stations if variations in noise. level are thought to occur in the vicinity of the duty stations. 3 10 3 Intake and exhaust openings, When measuring noise levels the microphone should where possible not be placed. within a 30 angle away from the direction of the gas stream and not less than a distance. of 1 m from the edge of the intake or exhaust opening of engines ventilation air conditioning. and cooler systems and as far as possible from reflecting surfaces. I MSC 91 22 Add 1 doc,MSC 91 22 Add 1,Annex 1 page 15. 3 11 Measurements in machinery spaces, 3 11 1 Measurements shall be taken at the principal working and control stations of the. seafarers in the machinery spaces and in the adjacent control rooms if any special attention. being paid to telephone locations and to positions where voice communication and audible. signals are important, 3 11 2 Measurements should not normally be taken closer than 1 m from operating.
machinery or from decks bulkheads or other large surfaces or from air inlets Where this is. not possible measurement shall be taken at a position midway between the machinery and. adjacent reflecting surface, 3 11 3 Measurements from machinery which constitutes a sound source should be taken. at 1 m from the machinery Measurement should be made at a height of between 1 2 m. to 1 6 m above the deck platform or walkway as follows. 1 at a distance of 1 m from and at intervals not greater than 3 m around. all sources such as,main turbines or engines at each level. main gearing,turbo blowers,electrical alternators and generators. boiler firing platform,forced and or induced draught fans. compressors, cargo pumps including their driving motors or turbines.
In order to avoid an unnecessarily large and impractical number. of measurements and recordings in the case of large engines and. of machinery spaces where the measured sound pressure level in dB A at the. intervals above does not vary significantly it will not be necessary to record. each position Full measurement at representative positions and at the. positions of maximum sound pressure level shall however be made and. recorded subject to at least four measurements being recorded at each level. 2 at local control stations e g the main manoeuvring or emergency. manoeuvring stand on the main engine and the machinery control rooms. 3 at all other locations not specified in 1 and 2 which would normally be. visited during routine inspection adjustment and maintenance. 4 at points on all normally used access routes unless covered by positions. already specified above at intervals not greater than 10 m and. 5 in rooms within the machinery space e g workshops In order to restrict. the number of measurements and recordings the number of recordings. can be reduced as in 1 subject to a total of at least four measurements. including those specified in this paragraph being recorded at each. machinery space level up to upper deck,I MSC 91 22 Add 1 doc.

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