Active Standard ASTM F956 | Developed by Subcommittee: F25.07
Book of Standards Volume: 01.07
Historical (view previous versions of standard)
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.
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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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
B584 Specification for Copper Alloy Sand Castings for General Applications
Other DocumentsCFR 33 Part 86, Subpart B, Bell or Gong
ICS Number Code 47.020.70 (Navigation and control equipment)