PROTECTION AGAINST NOISE ON BOARD SHIPS. Hideyuki SHURI Tokai University. Tripartite 16 th October 2010 Tokyo. Contents. 1. Introduction and Background. 2. Proposals for protection against noise on board ships. 3. Discussion and action of the Sub-Committee in DE53. 4.
Tripartite 16th October 2010
Introduction and Background
Proposals for protection against noise on board ships
Discussion and action of the Sub-Committee in DE53
Japan’s proposals for a revision of the Code
The development of amendments of SOLAS regulation Ⅱ-1/36 to incorporate mandatory noise regulations.
A revision of the existing Code on noise levels on board ships, IMO resolution A.468 (Ⅻ).
Regulation 36: Protection against noise
“Measures shall be taken to reduce the noise on board as far as possible and in any event it shall not exceed the mandatory maximum noise limits and the maximum noise exposure limits stipulated in IMO resolution A.468 (Ⅻ), chapter 4.2 and chapter 5. The actual noise levels shall be assessed on the basis of measurement conditions stipulated in chapter 2 and 3 or equivalent internationally recognised standards.”
At noise levels above 85dB(A), ear protection shall be used. At noise levels above 80dB(A), individual hearing protectors will be made available.
The regulation should apply to new ships and major conversion ships.
Chapter 4.2 : Maximum noise limits and spaces
A 5dB(A) reduction of the maximum noise level to IMO resolution A.468 (Ⅻ) for machinery spaces, workshops, mess rooms, cabins, etc.
A new room category and related noise level limits, which are different from IMO resolution A.468 (Ⅻ)
Application to commercial ships of all sizes.
Current Code : New ships of 1,600GT and over.
Some types of ships, such as fishing vessels and dynamically support craft, don’t be applied.
Chapter 2 : Operating conditions for measurement
At a load of minimum 90% of the installed maximum continuous rating (MCR)
In connection with dynamic positioning if this is a general part of the ship’s operation
Current Code : The main propulsion machinery should be run at normal design service shaft speed.
Chapter 5 : Noise exposure limits
Introduction of noise exposure limits according to ISO 1999:1990, LEX,8H=85dB(A)
Current Code : LEX,24H=80dB(A) as same as LEX,8H=85dB(A)
Chapter 6 : Acoustic insulation between accommodation spaces
The airborne sound insulation of the final design measured in ship – the apparent reduction factor R’ｗ, must not be more than 2dB worse than the stipulated reduction factors Rｗ.
The Sub-Committee agreed as following views.
The Code on Noise Levels on Board Ships should be revised as a first step.
The revised Code should not be applied to existing ships.
Differences in ship types and sizes should be taken into account.
The provisions of the Code should be made mandatory as a second step.
Engine room & accommodation structure model
Predicted noise levels and
locations of noise sources
Thank you for your attention