NOISE LEVEL SURVEY ON BOARD SHIPS AND ADVERSE EFFECT

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.

 

BACKGROUND

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.

STANDARDS FOLLOWED

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 ONBOARD

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)
1. Workspaces  
1 Machinery spaces 110
2 Machinery control rooms 75
3 Workshops 85
4 No.-specified workspaces 85
   
2 Accommodation
1 Cabins & Hospitals 60
2 Mess Rooms 65
3 Recreation rooms/day rooms 65
4 Offices/treatment rooms 65
5 Open recreation spaces 75
   
3 Navigational spaces
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
4 Radar Rooms 65
     
4 Service spaces  
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

 

References:

  • 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.

 

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