1、Designation: F957 91 (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 o
2、f last revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specification covers gongs for
3、 use on ships 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 Pl
4、ate, Sheet, and StripA276 Specification for Stainless Steel Bars and ShapesD3951 Practice for Commercial Packaging2.2 American Welding Society Standard:3AWS D1.1 Structural Welding Code2.3 Federal Specifications:4PPP-B-576 Box, Wood, Cleated, Veneer, Paper OverlaidPPP-B-585 Boxes, Wood, WireboundPPP
5、-B-591 Boxes, Fiberboard, Wood-cleatedPPP-B-601 Boxes, Wood, Cleated PlywoodPPP-B-621 Boxes, Wood, Nailed and Lock Corner2.4 Military Standard:4MIL-STD-129 Marking for Shipment and Storage3. Ordering Information3.1 Orders for gongs under this specification shall includethe following information:3.1.
6、1 ASTM designation 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 Speci
7、fication A167, UNS number 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 typ
8、e and sizes shown in Fig. 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 m
9、ay be made from two pieceswelded together, 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 th
10、e bracketsmay be left straight and not 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
11、 shall produce a sound pressurelevel of 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:6.2.1 Up to 10 mm: 61 mm.6.2.2 10 mm to 50 mm: 62 mm.1This specification is under the jurisdiction of AST
12、M 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 1985. Last previous edition approved in 2001 as F957 91 (2006).DOI: 10.1520/F0957-91R12.2For re
13、ferenced 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.3Available from American Welding Society (AWS), 550 NW LeJeune Rd.,M
14、iami, FL 33126, http:/www.aws.org.4Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United Stat
15、es.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.8.3 For orders of more than 10 gongs, they shall beseparated into groups of 10 (or fraction thereof) for samplingpurposes.9. Inspection and Testing
17、9.1 ResponsibilityUnless otherwise specified in the pur-chase order, the manufacturer shall be responsible for theNOTEAll dimensions in millimetres.FIG. 1 Assembly of GongF957 91 (2012)2performance of all inspection and testing specified herein. Themanufacturer may utilize his own facilities or any
18、commercialfacility acceptable to the purchaser. The purchaser reserves theright to perform any of the inspections and tests set forth wheresuch are deemed necessary to ensure that supplies conform toprescribed requirements. Nonconforming gongs shall not beoffered for delivery.9.2 InspectionThe dimen
19、sions of the gong and its com-ponents shall be checked to ensure that they are withinspecified tolerances.9.3 Acoustic TestEach gong tested shall be supported asshown in Fig. 1 with the clapper in place. The gong shall berung by striking the cylinder with the clapper, activated by alanyard. The soun
20、d, produced in accordance with AppendixX1, shall be measured in a space with no large sound reflectingsurfaces (except the floor) that are within 10 m. The sound shallbe measured using a commercial sound level meter located ata distance of 1 m and at a height above the floor equal to thatof the stri
21、king point.10. Product Marking10.1 The letters “ASTM” and this specification numbershall be engraved on the gong cylinder in figures at least 6 mmhigh.10.2 The manufacturer may engrave his brand name or logoon the inside of the gong cylinder.NOTEAll dimensions in millimetres.FIG. 2 Miscellaneous Det
22、ailsF957 91 (2012)311. Packaging and Package Marking11.1 No preservation is required.11.2 Unless otherwise specified, packaging and markingshall conform to Practice D3951 and shall, when specified,include bar code marking.11.3 For government procurements for long-term storage oroverseas shipment, th
23、e requirements of Annex A1 apply. Insuch case the required level of packaging shall be specified.12. Supersession12.1 This specification is intended to supersede Bureau ofShips drawing S2408-F-921899. The cancellation of Bureau ofShips S2408-F-921899 drawing and adoption of this specifi-cation can o
24、nly be effected by the Navy.NOTE 1The Bureau of Ships was one of the predecessors of the NavalShip/Sea Systems Command.13. Keywords13.1 clapper; gong; gong cylinder; signaling; soundsignalingANNEX(Mandatory Information)A1. PACKING FOR DoD PROCUREMENTSA1.1 Applicable documents for this annex only.A1.
25、1.1 Federal SpecificationsPPP-B-576, PPP-B-585,PPP-B-591, PPP-B-601, and PPP-B-621.A1.1.2 Military StandardMIL-STD-129.A1.2 PreservationNone required.A1.3 PackingThe gong shall be cushioned, blocked, orbraced within the container in a manner to prohibit movement,and the clappers shall be secured or
26、cushioned to preventknocking. Unless otherwise specified in the purchase order,one gong shall be packed per container. When more than onegong is required to be packed in each container, the gross massof the wood or wood-cleated boxes shall not exceed approxi-mately 100 kg (220 lbs).A1.3.1 Level AGon
27、gs shall be packed in containers con-forming to any one of the following specifications at the optionof the manufacturer:Specification Type or ClassPPP-B-585 Class 3PPP-B-601 OverseasPPP-B-621 Class 2A1.3.1.1 Boxes shall be closed and banded in accordancewith the applicable box specification.A1.3.2
28、Level BGongs shall be packed in boxes conform-ing to any of the following specifications at the option of themanufacturer.Specification Type or ClassPPP-B-576 Class 2PPP-B-585 Class 1 or 2PPP-B-591 WeatherresistantPPP-B-601 DomesticPPP-B-621 Class 1A1.3.2.1 Box closures shall be as specified in the
29、appli-cable box specification.A1.3.3 Level CGongs shall be packed and have con-tainer closure as specified for Level B, except that containersmay be of the domestic type or class.A1.3.4 Commercial packing shall conform to 11.2.A1.4 MarkingIn addition to any special marking requiredby the order, ship
30、ments shall be marked in accordance withMIL-STD-129 or Practice D3951 as applicable and whenspecified shall include bar code markings.APPENDIX(Nonmandatory Information)X1. EXCERPTS FROM U. S. COAST GUARD RULESX1.1 For general information, the following is quoted fromU. S. Coast Guard Commandant Inst
31、ruction M16672.2A:Navigation Rules, International-Inland.X1.1.1 Division II, Part D, Rule 33Equipment for SoundSignals:X1.1.1.1 A vessel of 12 m or more in length shall beprovided with a whistle and a bell and a vessel of 100 m ormore in length shall, in addition, be provided with a gong, thetone an
32、d sound of which cannot be confused with that of thebell. The whistle, bell, and gong shall comply with thespecifications in Annex III to these regulations. The bell orgong, or both, may be replaced by other equipment having thesame respective sound characteristics, provided that manualsounding of t
33、he required signals shall always be possible.F957 91 (2012)4X1.1.1.2 A vessel of less than 12 m in length shall not beobliged to carry the sound signalling appliances prescribed inX1.2.1 of this rule but if she does not, she shall be providedwith some other means of making an efficient sound signal.
34、X1.1.2 Division II, Part E, Annex IIITechnical Details ofSound Signal Appliances: International Rules:X1.1.2.1 Whistles (not germane to this specification. There-fore, not quoted).X1.1.2.2 Bell or Gong:(a) Intensity of SignalA bell or gong, or other devicehaving similar sound characteristics shall p
35、roduce a soundpressure level of not less than 110 dB at a distance of 1 m fromit.(b) ConstructionBells and gongs shall be made ofcorrosion-resistant material and designed to give a clear tone.The diameter of the mouth of the bell shall be not less than 300mm for vessels of 20 m or more in length, an
36、d shall be not lessthan 200 mm for vessels of 12 m or more but of less than 20m in length. Where practicable, a power-driven bell striker isrecommended to ensure constant force but manual operationshall be possible. The mass of the striker shall be not less than3 % of the mass of the bell.X1.1.2.3 A
37、pprovalThe construction of sound signal ap-pliances, their performance and their installation on board thevessel shall be to the satisfaction of the appropriate authority ofthe state whose flag the vessel is entitled to fly.X1.1.3 Division II, Part E, Subpart BBell or GongInland Rules:X1.1.3.1 Inten
38、sity of SignalA bell or gong, or otherdevice having similar sound characteristics shall produce asound pressure level of not less than 110 dB at 1 m.X1.1.3.2 ConstructionBells and gongs shall be made ofcorrosion-resistant material and designed to give a clear tone.The diameter of the mouth of the be
39、ll shall be not less than 300mm for vessels of more than 20 m in length, and shall be notless than 200 mm for vessels of 12 to 20 m in length. The massof the striker shall be not less than 3 % of the mass of the bell.The striker shall be capable of manual operation.NOTE X1.1When practicable, a power
40、-driven bell striker is recom-mended to ensure constant force.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such
41、patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited
42、either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fa
43、ir hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this st
44、andard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).F957 91 (2012)5
