ASTM_F_956_-_91_2012.pdf

Designation:F95691(Reapproved 2012)An American National StandardStandard Specification forBell,Cast,Sound Signalling1This standard is issued under the fixed designation F956;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 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 compliancewith the rules in the convention on the International Regula-tions for Preventing Collisions at Sea(commonly calledColregs).2See Appendix X1.1.2 Bells and bulkhead mounting plate shall be sized asindicated in Section 4(see Appendix X2).1.3 For consistency with International Regulations,all mea-surements are in SI units.2.Referenced Documents2.1 ASTM Standards:3B584 Specification for Copper Alloy Sand Castings forGeneral Applications2.2 Other Documents:CFR 33 Part 8172 Implementing Rules2CFR 33 Part 86,Subpart B,Bell or Gong23.Terminology3.1 Definitions:3.1.1 bell,na hollow metal instrument that rings whenstruck.3.1.2 cast,vto form by molding in a hollow form forshaping a liquid or plastic substance.3.1.3 clapper,nhammer like object inside a bell.4.Classification4.1 Bells shall be furnished in the following sizes,based onbellmouth diameter in millimetres(see Appendix X2):4.1.1 150 mm,4.1.2 200 mm(2.2 kg),4.1.3 200 mm(4.5 kg),4.1.4 250 mm,4.1.5 300 mm,4.1.6 360 mm,4.1.7 400 mm,and4.1.8 550 mm.4.2 Bulkhead mounting plates shall be furnished for thefollowing bell sizes:4.2.1 150 mm,and4.2.2 200 mm.5.Ordering Information5.1 Orders for materials under this specification shall in-clude the following information:5.1.1 ASTM designation and year of issue.5.1.2 Number of bells.5.1.3 Size of bell(s)(see 4.1).5.1.4 Additional bulkhead mounting plates(see 4.2 and6.2.2).5.1.5 Inscription required(see 12.1).5.1.6 Packaging,if other than commercial(see Section13).6.Materials and Manufacture6.1 Material:6.1.1 Bell bodies,clappers,and other cast fittings and partsshall be copper alloy conforming to Specification B584,UNSC87200.6.1.2 Fittings such as bolts,nuts,washers,pins,and sup-porting lugs shall be of copper alloy compatible with the bellcastings.6.2 Manufacture:6.2.1 Construction shall be in accordance with Fig.1,Fig.2,and Fig.3.6.2.2 For Fig.1 and Fig.2,one bulkhead mounting plateshall be furnished with each bell,however,additional mount-ing plates may be ordered.6.2.3 For all bells,two extra supporting nuts,washers,andacorn nuts(where used)shall be furnished.1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.07 onGeneral Requirements.Current edition approved May 1,2012.Published May 2012.Originallyapproved in 1986.Last previous edition approved in 2006 as F956 91(2006).DOI:10.1520/F0956-91R12.2Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/www.dodssp.daps.mil.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.Acoustic Requirements7.1 Bells shall have full,clear,round,and far reachingtones.The sound pressure level shall not be less than 110 dB ata distance of 1 m from it.8.Dimensions,Mass,and Permissible Variations8.1 Dimensions and mass of bells,together with tolerances,shall conform to Fig.1,Fig.2,and Fig.3.9.Workmanship,Finish,and Appearance9.1 Bells shall be free of cracks,burrs,sharp cutting edges,adhering sand,and other defects and blemishes affecting theirlife,appearance,and serviceability.9.2 Bell exteriors and the lower part of the interior,from thebellmouth to 10 mm above the line where the clapper strikesthe bell,shall have a smooth polished finish.The“visible”partof the clapper shall have a similar finish.10.Sampling10.1 For orders for 1 or 2 bells of the same size,each bellshall be inspected and tested.10.2 For orders for 3 to 10 bells of the same size,2 bellsshall be selected at random.If any one of them fails to meet therequirements,then all bells in the order shall be inspected andtested.10.3 For orders for more than 10 bells of the same size.They shall be separated into groups of 10(or fraction thereof)for sampling purposes.11.Inspection and Testing11.1 ResponsibilityUnless otherwise specified in theorder,the manufacturer is responsible for the performance ofall inspection requirements specified herein.The manufacturermay utilize his own facilities or any commercial facilitiesacceptable to the purchaser.