1、Designation: F 957 91 (Reapproved 2006)An American National StandardStandard Specification forGong, Sound Signaling1This standard is issued under the fixed designation F 957; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year
2、 of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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
3、for 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:2A 167 Specification for Stainless and Heat-ResistingChromium-Nickel Stee
4、l Plate, Sheet, and StripA 276 Specification for Stainless Steel Bars and ShapesD 3951 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, Wirebo
5、undPPP-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 informatio
6、n:3.1.1 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
7、 Specification A 167, UNS number S31600.4.1.2 The clapper mass shall be of cast alloy steel inaccordance with Specification A 276, 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
8、 the type 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 cy
9、linder may 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 en
10、ds of the 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 Requirements Acoustic Requirement
11、s5.1 The sound characteristics 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.1This specification is under the jurisdiction of A
12、STM Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.07 onGeneral Requirements.Current edition approved Dec. 1, 2006. Published January 2007. Originallyapproved in 1985. Last previous edition approved in 2001 as F 957 91 (2001).2For referenced ASTM sta
13、ndards, 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.,Miami, FL 33126, h
14、ttp:/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 States.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
16、orders of 3 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.NOTEAll dimensions in millimetres.FIG. 1 Assembly of GongF 957 91 (2006)28.3 For orders of more than 10 gongs, they shall beseparated i
17、nto 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 inspection and testing specified herein. Themanufacturer may utilize his own facil
18、ities or any 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 Inspec
19、tionThe dimensions 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 alany
20、ard. The sound, 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 th
21、atof the striking point.NOTEAll dimensions in millimetres.FIG. 2 Miscellaneous DetailsF 957 91 (2006)310. 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
22、 the inside of the gong cylinder.11. Packaging and Package Marking11.1 No preservation is required.11.2 Unless otherwise specified, packaging and markingshall conform to Practice D 3951 and shall, when specified,include bar code marking.11.3 For government procurements for long-term storage oroverse
23、as shipment, the 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 speci
24、fi-cation can only 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
25、 annex only.A1.1.1 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
26、 be secured or 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
27、.3.1 Level AGongs 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 specif
28、ication.A1.3.2 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 sp
29、ecified in the 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
30、the order, shipments shall be marked in accordance withMIL-STD-129 or Practice D 3951 as applicable and whenspecified shall include bar code markings.F 957 91 (2006)4APPENDIX(Nonmandatory Information)X1. EXCERPTS FROM U. S. COAST GUARD RULESX1.1 For general information, the following is quoted fromU
31、. S. Coast Guard Commandant Instruction 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
32、provided with a gong, thetone and 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, p
33、rovided that manualsounding of the required signals shall always be possible.X1.1.1.2 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 effici
34、ent sound signal.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 charac
35、teristics shall produce 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 m
36、ore in length, and 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 th
37、e bell.X1.1.2.3 ApprovalThe 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 Rul
38、es:X1.1.3.1 Intensity 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 th
39、e mouth of the bell 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 pra
40、cticable, a power-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 vali
41、dity of any such 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 comm
42、ents are invited 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
43、not received a fair 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 standard 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).F 957 91 (2006)5
