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ASTM F956-91(2006)

Historical Reaffirmation

Standard Specification for Bell, Cast, Sound Signalling

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1.1 This specification covers cast sound-signalling bells, together with bulkhead mounting plates for the smaller bells, for use on ships, boats, and other marine craft, for compliance with the rules in the convention on the International Regulations for Preventing Collisions at Sea (commonly called Colregs). See Appendix X1.

1.2 Bells and bulkhead mounting plate shall be sized as indicated in Section 4 (see Appendix X2).

1.3 For consistency with International Regulations, all measurements are in SI units.


This specification covers cast sound-signalling bells, together with bulkhead mounting plates for the smaller bells, for use on ships, boats, and other marine craft, for compliance with the rules in the convention on the International Regulations for Preventing Collisions at Sea. Bell bodies, clappers, and other cast fittings and parts shall be copper alloy. Fittings such as bolts, nuts, washers, pins, and supporting lugs shall be of copper alloy compatible with the bell castings. Bells shall have full, clear, round, and farreaching tones. The sound pressure level shall not be less than 110 dB at a distance of 1 m from it. Acoustic tests shall be conducted only for the 200 mm heavy and larger bells to check the requirements prescribed.


SDO ASTM: ASTM International
Document Number F956
Publication Date Dec. 1, 2006
Language en - English
Page Count 5
Revision Level 91(2006)
Supercedes
Committee F25.07
Publish Date Document Id Type View
Jan. 1, 1996 F0956-91R96 Revision
May 1, 2023 F0956-91R23 Reaffirmation
Oct. 1, 2018 F0956-91R18 Reaffirmation
May 1, 2012 F0956-91R12 Reaffirmation
Dec. 1, 2006 F0956-91R06 Reaffirmation
Jan. 1, 1996 F0956-91R01 Reaffirmation