Merchant Shipping Act, 1951 (Act No. 57 of 1951)

Regulations

Merchant Shipping (Collision and Distress Signals) Regulations, 2005

Annex III : Technical Details of Sound Signal Appliances

2. Bell or gong

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(a) Intensity of signal

 

A bell or gong, or other device having similar sound characteristics shall produce a sound pressure level of not less than 110 dB at a distance of 1 metre from it.

 

(b) Construction

 

Bells and gongs shall be made of corrosion-resistant material and designed to give a clear tone. The diameter of the mouth of the bell shall be not less than 300 mm for vessels of 20 metres or more in length. Where practicable, a power-driven bell striker is recommended to ensure constant force but manual operation shall be possible. The mass of the striker shall be not less than 3 per cent of the mass of the bell