2. Bell or gong
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Statutory Documents - IMO Publications and Documents - International Conventions - COLREGS - International Regulations for Preventing Collisions at Sea - International Regulations for preventing Collisions at Sea, 1972 - Annex Ill - Technical Details of Sound Signal Appliances - 2. Bell or gong

2. Bell or gong

Parent topic: Annex Ill - Technical Details of Sound Signal Appliances

(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.

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