Annex 11 - Exposure of Personnel to Potentially Harmful Noise (see Section 22.10.6 )
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Statutory Documents - MCA Publications - MGN 280 - Small Vessels in Commercial Use for Sport or Pleasure, Workboats and Pilot Boats - Alternative Construction Standards - Annex 11 - Exposure of Personnel to Potentially Harmful Noise (see Section 22.10.6)

Annex 11 - Exposure of Personnel to Potentially Harmful Noise (see Section 22.10.6 )

 (Edited extracts from Section 8 of the 'Code of Practice for Noise Levels in Ships', second edition, 1992, published by HMSO)

  1. The following figures illustrate the acceptable maximum daily noise doses for unprotected ears, based on dB(A) sound energy received:-

Less than 80dB(A) for no limit (24 hours)
  82dB(A) for 16 hours
  85dB(A) for 8 hours
  90dB(A) for 2 hours
  95dB(A) for 50 minutes
  100dB(A) for 15 minutes
  105dB(A) for 5 minutes
  110dB(A) for 1 minute

  2. The following examples of noise levels in different locations to allow personnel to gauge the existence of conditions giving potentially harmful noise exposure:-

120dB(A) between 2 running 1800rpm diesel generators
110dB(A) in a small ship engine room with 900 rpm diesel main engines and 1550 rpm generator
105dB(A) 1 metre from cylinder tops of a slow speed (120 rpm) diesel main engine
100dB(A) between 2 running 600 rpm diesel generators
95dB(A) in a slow speed (120 rpm) diesel main engine at the aft end on the floor plate level
90dB(a) machine shop or quieter parts of ship's engine room
80dB(A) 15 metres from a pneumatic drill
70dB(A) vacuum cleaner at 3 metres
60dB(A) inside a supermarket
50dB(A) inside a house in a suburban area during daytime
(These levels are only approximate as engine noise varies considerably with type of installation).
Parent topic: MGN 280 - Small Vessels in Commercial Use for Sport or Pleasure, Workboats and Pilot Boats - Alternative Construction Standards
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