1、Designation:F95791(Reapproved 2012)An American National StandardStandard Specification forGong,Sound Signaling1This standard is issued under the fixed designation F957;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last
2、revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This specification covers gongs for use on sh
3、ips 100 mor more in length,as required by International Regulations(seeAppendix X1).1.2 For consistency with International Regulations,all mea-surements are in SI units.2.Referenced Documents2.1 ASTM Standards:2A167 Specification for Stainless and Heat-ResistingChromium-Nickel Steel Plate,Sheet,and
4、Strip(With-drawn 2014)3A276 Specification for Stainless Steel Bars and ShapesD3951 Practice for Commercial Packaging2.2 American Welding Society Standard:4AWS D1.1 Structural Welding Code2.3Federal Specifications:5PPP-B-576 Box,Wood,Cleated,Veneer,Paper OverlaidPPP-B-585 Boxes,Wood,WireboundPPP-B-59
5、1 Boxes,Fiberboard,Wood-cleatedPPP-B-601 Boxes,Wood,Cleated PlywoodPPP-B-621 Boxes,Wood,Nailed and Lock Corner2.4 Military Standard:5MIL-STD-129 Marking for Shipment and Storage3.Ordering Information3.1 Orders for gongs under this specification shall includethe following information:3.1.1 ASTM desig
6、nation and year of issue.3.1.2 Number of gongs.3.1.3 Packaging and marking,if other than commercial.4.Materials and Manufacture4.1 Materials:4.1.1 The gong cylinder,brackets,clapper rod,“U”bracket,washers,and clapper support pin shall be of stainless steel,inaccordance with Specification A167,UNS nu
7、mber S31600.4.1.2 The clapper mass shall be of cast alloy steel inaccordance with Specification A276,UNS S31600.4.1.3 The support bolt,nut,flat washer,and cotter pins shallbe of stainless steel compatible with the other materials.4.2 Welding:4.2.1 Welding shall be of the type and sizes shown in Fig.
8、1and Fig.2,and in accordance with Standard AWS D1.1.4.3 Manufacture:4.3.1 Fig.1 shows the general arrangement of the assembledgong,as well as details of the gong cylinder.Fig.2 showsdetails of the brackets,clapper,and miscellaneous fittings.4.3.2 The gong cylinder may be made from two pieceswelded t
9、ogether,instead of one piece.Two piece constructionshall be annealed to remove residual stresses.4.3.3 Sharp corners and edges of the cylinder shall bebroken.4.3.4 The two brackets shall be welded together beforebeing welded to the cylinder.The flanged ends of the bracketsmay be left straight and no
10、t shaped to the cylinder.4.3.5 The clapper mass shall be welded to the clapper rodbefore forming the second eye.4.4 Extra Parts:4.4.1 Two extra supporting nuts and flat washers shall befurnished with each gong.5.Acoustic Requirements5.1 The sound characteristics shall produce a sound pressurelevel o
11、f not less than 110 dB at a distance of 1 m.6.Dimensions and Tolerances6.1 Dimensions shall conform to Fig.1 and Fig.2.6.2 Tolerances shall be as follows:1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee
12、 F25.07 onGeneral Requirements.Current edition approved May 1,2012.Published May 2012.Originallyapproved in 1985.Last previous edition approved in 2001 as F957 91(2006).DOI:10.1520/F0957-91R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at servi
13、ceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from American Welding Society(AWS),550 NW LeJeune Rd.,Miami,FL 33126,http:/www
14、.aws.org.5Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/www.dodssp.daps.mil.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.2.1 Up to 10 mm:61 mm.6.2.2 10 mm to
15、 50 mm:62 mm.6.2.3 Over 50 mm:63 mm.7.Workmanship,Finish,and Appearance7.1 Gongs shall be free from cracks,burrs,sharp cuttingedges,and other defects affecting their life,appearance,andserviceability.8.Sampling8.1 For orders of 1 or 2 gongs,each gong shall be inspectedand tested.8.2 For orders of 3
16、to 10 gongs,2 gongs shall be selected atrandom.If any one of them fails to meet requirements,then allgongs in the order shall be inspected and tested.NOTE1All dimensions in millimetres.FIG.1 Assembly of GongF957 91(2012)2 8.3 For orders of more than 10 gongs,they shall beseparated into groups of 10(or fraction thereof)for samplingpurposes.9.Inspection and Testing9.1 ResponsibilityUnless otherwise specified in the pur-chase order,the manufacturer shall be responsible for theperformance of all ins
