ABNORMAL NOISE LEVELS ON BOARD SHIPS AND ADVERSE EFFECT ON SEAFARERS HEALTH & SAFETY
We, Constellation Marine Services LLC as independent ship and marine surveyors do attend nominations from various clients to carry out the Noise Level survey. Recently we got a nomination from one of our clients to carry out the Noise level survey onboard an Anchor Handling Tug. Our Naval Architect/Marine Surveyor upon receipt of the instruction, arranged to attend an inspection onboard the subject vessel.
The purpose of noise level survey onboard ships is to provide a safe working condition by taking into consideration the need for verbal communication and to attend to audible alarms. Also to provide an environment where decisions on clear-heard instructions could be made at control stations, navigation bridges, radio room, and manned machinery spaces (Ex. Engine Control Room).
It will protect the seafarer from excessive noise levels which could give rise to noise-induced hearing losses and also to provide the seafarer with an acceptable degree of comfort during rest, recreation, and other spaces and also provide conditions for recuperation from the effects of exposure to high noise levels. Seafarers should not be exposed to noise level above 85dB, however in case of spaces with exceeding 85dB sound levels, seafarers should use suitable hearing protection equipment.
In order to have seafarers, proper rest hours accommodation spaces should be reasonably acoustic proof.
International standards on noise levels to be maintained onboard vessels have been developed as (IMO Res. MSC.337 (91), CODE ON NOISE ON BOARD SHIPS)
Equipment used for the inspection are calibrated in accordance with IEC 60942-1:2003 & measurement levels/methods is based on ISO 2923:1996. Measurement of noise levels was conducted at 80% of the MCR (maximum continuous rating).
Inspection was carried out in all work, accommodation, navigational & service spaces. Readings observed during the inspection were noted to be within acceptable limits. In engine room noise level noted to above 85db,
Maximum Acceptable Sound Pressure Levels are given in dB (A)
|No.||Designation of rooms & spaces||Noise Limit (dB)|
|2||Machinery control rooms||75|
|1||Cabins & Hospitals||60|
|3||Recreation rooms/day rooms||65|
|5||Open recreation spaces||75|
|1||Navigational bridge & chartrooms||65|
|2||Listening/look-out posts, including navigational bridge||70|
|3||Separated radio rooms (with radio equipment operating but not producing audio signals)||60|
|1||Galleys, without food processing equipment, operating||75|
|2||Serveries and pantries||75|
|5||Normally unoccupied spaces|
|1||Spaces not specified||90|
|2||Suez crew room||65|
- MSC 337(91); CODE ON NOISE ON BOARD SHIPS
- IMO Resolution A.468 (XII) – 11:1981; CODE ON NOISE
Prepared by Engr. Vignesh Prabhu.
Naval Architect/Marine Surveyor.