Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. इंटरनेट मानक “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda “Invent a New India Using Knowledge” “प0रा1 को छोड न’ 5 तरफ” Jawaharlal Nehru “Step Out From the Old to the New” “जान1 का अ+धकार, जी1 का अ+धकार” Mazdoor Kisan Shakti Sangathan “The Right to Information, The Right to Live” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 13161-1 (1991): Shipbuilding - Noise Levels Onboard Ships, Part 1: Glossary of Terms [TED 17: Shipbuilding]
Transcript
Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.
इंटरनेट मानक
“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru
“Step Out From the Old to the New”
“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan
“The Right to Information, The Right to Live”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
“Invent a New India Using Knowledge”
है”ह”ह
IS 13161-1 (1991): Shipbuilding - Noise Levels OnboardShips, Part 1: Glossary of Terms [TED 17: Shipbuilding]
IS 13161 ( Part 1 ) : 1991
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Indian Standard
SHIPBUILDING - NOISE LEVELS ONBOARD SHIP-S
PART 1 GLOSSARY OF TERMS
UDC 629’12 : 534’61 : 001’4
@ BIS 1991
BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
-November 1991 Price Group 1
Shipbuilding Sectional Committee, TED 17
FOREWORD
This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Shipbuilding Sectional Committee had been approved by the Transport Engineering Division Council.
This Indian Standard is one in the series of Indian Standards being published for noise levels onboard ships. The other parts in this series are:
Part 2 Measurement Part 3 Maximum noise levels Part 4 Noise exposure limits Part 5 Requirement for protection
Part 6 Guidelines for controlling noise exposure
The purpose of this standard is to limit noise levels and to reduce exposure to noise in order to:
a) provide for safe working conditions by giving consideration to the need for speech communi- cation 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;
b) protect the seafarer from excessive noise levek which may give rise-to a noisecinduced hearing loss; and
C) provide the seafarer with an acceptable degree of comfort in rest, recreation and other space and also provide conditions for recuperation from the effects of exposure to high noise levels.
In the preparation of this standard assistance has been derived from Publication No. 814 82’05E ‘Noise levels onboard ships’, issued by International Maritime Organization ( IMO ).
I!3 l3l61-( Part I ) : 1991
Indian Standard
SHIPBUILDING - NOISE LEVELS ONBOARD SHIPS
PART 1 GLOSSARY OF TERMS
1 SCOPE
This standard gives the definitions of terms used in connection with noise levels onboard ships.
2 REFERENCES
IS 4755 : 1987 ‘Reference zero for the calibration of pure tone air conduction audiometers (jrst revision )’ is a necessary adjunct to this standard.
3 TERMINOLOGY
For the purpose of this standard, the following definitions shall apply.
3.1 Accommodation Spaces
Cabins, offices ( for carrying out ship’s business ), hospitals, mess rooms, recreation rooms ( such as lounges, smoke rooms, cinemas, libraries and hobbies and games rooms ), open recreation areas to be used by seafarers, galleys, serveries, pantries, changing rooms, bath-rooms and similar spaces.
3.2 Auxiliary Machinery Machinery other than main propelling machinery that is in service when the ship is in normal service, for example, auxiliary diesel engines, turbogenera- tors, hydraulic motors and pumps, compressors, ventilation fans, gear pumps.
3.3 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.
3.4 Continuously Manned Spaces Spaces in which continuous or prolonged presence of seafarers is necessary for normal operational periods.
3.5 Duty Stations
Those spaces in which the main navigating equip- ment, 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 ), workshops other than those forming part of the machinery spaces and similar such spaces.
3.6 Ear Protector
A device worn to reduce the level of noise heard by the wearer.
3.7 Effective Sound Level Lef x H
A notional continuous sound level which is calcu- lated from the various A-weighted sound levels and duration at these levels with an XdB exchange rate. The exchange rate is the number of dB decrease in noise level which would allow doubling of exposure time. Lef ( 3 ) ( H ) is equal to Leq H. In instances of fluctuating noise and intermittent exposures 5dB is often used for X. ‘H’ represents the time period concerned expressed in hours.
3.8 Equivalent Continuous Souud Level Les H
A notional level which would in the course of a given time period ( H ) cause the same A-weighted sound energy to be received as that due to the actual sound over the period._ _‘H’ represents the time period concerned expressed in hours.
T
Leq = 10 loglo -+ s
pa(t) )” & pa”
where T =
pa(t) =
measurement time,
A-weighted instantaneous sound pressure, and
po = 20 x 10-8 Pascal ( the reference level ).
3.9 Fluctuating Noise
0
Noise which is varying in level rising and falling. For the purpose of this standard it may be taken to mean fluctuations in excess of the steady noise as defined in 3.25 and excludes impulse noise as defined in 3.11.
3.10 Hearing Loss
Hearing loss is evaluated in relation to a reference auditory threshold defined conventionally in IS 4755 : 1987. The hearing loss corresponds to the difference between the auditory threshold of the subject being examined and the reference audi- tory threshold, taking an average loss of 25 dB calculated at frequencies 500, 1 000 and 2 000 Hz.
1
IS 13161 ( Part 1 ) : 1991
3.11 Impulse Noise
Noise of less than one second’s duration which occurs as an isolated event, or as one of a series of events with a repetition rate of less than 15 times per second.
3.12 Integrating Sound Level Meter
A sound level meter designed or adapted to measure the level of the mean squared time averaged A-weighted sound pressure.
3.13 Machinery Spaces
All spaces containing propulsion machinery, boilers, pumps, oil fuel units, stem and internal combustion engines, generatorsand major electrical
jyI machinery, oil filling stations, refrigerating, stabilizing, ventilation and air-conditioning machi- nery and similar spaces, trunks to such spaces and engineer’s workshop.
3.14 Navigating Bridge Wings
Those parts of the ship’s navigating bridge exten- ding towards the ship’s sides.
3.15 Noise
For the purpose of this standard all sound which can result in hearing impairment, or which can be harmful to health or be otherwise dangerous.
3.16 Noise Induced Hearing Loss
A hearing loss, originating in the nerve cells with in the cochlea, attributable to the effects of sound.
3.17 Noise Level
A-weighted sound pressure level ( see 3.3 ).
3.18 Normal Service Shaft Speed
The shaft speed specified for the ship’s acceptance on initial delivery or after being modified, as applicable.
3.19 Occasional Exposures
Those exposures typically occurring once per week, or less frequently.
3.20 Passenger
Any person on board other than the master and members of the crew or other persons employed or engaged in any capacity onboard a ship on the business of the ship.
3.21 Port Condition
The condition in which all machinery solely required for propulsion is stopped.
3.22 Potentially Hazardous Noise Levels
Those levels at the above which persons exposed to them without protection are at risk of sustaining a noise induced hearing loss.
3.23 Sound
Energy that is transmitted by pressure waves in air or other materials and is the objective cause of the sensation of hearing.
3.24 Sound Pressure Level
A measure of sound level, L, on a logarithmic scale given by:
P L = 20 log,,, po dB f 1
where p = rms value of measured sound pressure
between 20 Hz and 20 kHz, and
PO = 20 x 10Ns Pascal ( the reference level 1.
3.25 Steady Noise
A sound where the level fluctuates through a total range of less than 5dB ( A ) as measured on the ‘slow’ response of a sound level meter in one minute.
3.26 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 voyages.
2
Standard Mark
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Bureau of Indian Standards
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Revision of Indian Standards
Indian Standards are reviewed periodically and revised, ~when necessary and amendments, if any, dare issued from time to time. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition. Comments on this Indian Standard may be sent to RIS giving the following reference:
Dot : No. TED 17 ( 889 )
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
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