1、Designation:F293512An American National StandardStandard Specification forChocks,Panama,Mooring Cast Steel1This standard is issued under the fixed designation F2935;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last rev
2、ision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers the principal dimensions andmaterials of chocks installed in ships to comply with theregulations of the P
3、anama Canal.1.2 Chocks can be used with either wire rope or fiber andsynthetic ropes.1.3 Chocks are for mounting directly on a deck,seat(foundation)or for mounting in a bulwark.1.4 To meet Panama Canal Company regulations the radiusof contact surfaces of lines must be 180 mm.1.5 The values stated in
4、 SI units are to be regarded as thestandard.2.Referenced Documents2.1 ASTM Standards:2A27/A27M Specification for Steel Castings,Carbon,forGeneral Application2.2 ANSI Standard:3B 46.1 Surface Texture3.Descriptions of Terms Specific to This Standard3.1 bulwarka structural enclosure along the edge of t
5、heship to serve as a rail.3.2 closed chocka metal flared ring-like fitting mountedon a ship through which mooring lines pass to tow or moor aship.3.3 mooring ring or pipea chock mounted in the bulwarkand conforming to Type II or IV.3.4 rope contact areathat part of the fitting in contact withthe moo
6、ring line in normal mooring operations.4.Classification4.1 The size of the chock shall be identified by the nominalsize“L”and“H”of the opening as shown in Table 1 and Fig.1,and Table 2 and Fig.2.Sizes larger than 360 mm by 260 mmmay be considered as double chocks.4.2 Chocks are furnished in types as
7、 follows:4.2.1 Type IDeck mounted,as shown in Fig.1,andconforms to all dimensions in Table 1.4.2.2 Type IIBulwark mounted,as shown in Fig.2,andconforms to all dimensions in Table 2.4.2.3 Type IIIDeck mounted conforming only to dimen-sions“L”,“H”,and 180 mm radius at entrance,as shown inFig.1 and Tab
8、le 1 and the requirements of Sections 6 10.4.2.4 Type IVBulwark mounted conforming only to di-mensions“L”,“H”,and 180 mm radius at entrance,as shownin Fig.2 and Table 2 and the requirements of Sections 6 to 10.4.3 Chocks shall be furnished in either of the followinggrades:4.3.1 Grade 1Surface finish
9、 shall be in the as castcondition.4.3.2 Grade 2Surface finish in way of rope contact shallbe in accordance with 7.2.5.Ordering Information5.1 Orders for chocks under this specification shall includethis standard date,and the following:5.1.1 Quantity(number)of chocks required,5.1.2 Size(opening,L H),
10、5.1.3 Type and grade,5.1.4 Primer and coating,if any(see 7.3),and5.1.5 Marking.6.Materials and Manufacture6.1 Material shall be cast steel in accordance with Specifi-cation A27/A27M,Grade 60-30.6.2 For Types III and IV the manufacturer shall certify thatchock is in compliance with Panama Canal requi
11、rements.6.3 Casting shall be smooth,fine grain,and free of cracks,hot tears,and blow holes,detrimental to end use.Defectshaving an area larger than 25 by 25 mm2and a depth of morethan 10%of the thickness in way thereof will be cause forrejection.Small defects in way of rope contact shall be welded1T
12、his specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.01 onStructures.Current edition approved Jan.1,2012.Published February 2012.DOI:10.1520/F2935-12.2For referenced ASTM standards,visit the ASTM website,
13、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 National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org
14、.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 and finished smooth.Where applicable,welding shall be inaccordance with code requirements,such as ABS,AWS and soon,and may require post weld heat treatment(PWHT).6.4 All excess material,ven
15、ts,and gates shall be removedand finished smooth to match the surrounding surface.6.5 Limber or drain holes shall be 25 mm in diameter andprovided in webs and brackets to prevent water entrapment.6.6 Type I shall be in accordance with Fig.1 and Table 1.6.7 Type II shall be in accordance with Fig.2 a
16、nd Table 2.7.Workmanship,Finish,and Appearance7.1 Casting shall be sand,grit,or shot blasted to a graymetal finish to remove all loose scale.All mold flashing shallbe removed and radii shall be fair so as to present an evensurface.7.2 Surface of Grade 2 chocks shall have a rope contactsurface of average surface roughness of 3 m or less,inaccordance withANSI standard B 46.1 so as to reduce abrasivedamage to fiber and synthetic ropes.TABLE 1 Dimension Requirements(see Fig.1)(Unit:mm)Nominal sizeLl
