ASTM F2936-2012 Standard Specification for Chocks Ship Mooring Cast Steel《船锚用铸钢轮挡的标准规格》.pdf
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1、Designation: F2936 12An American National StandardStandard Specification forChocks, Ship Mooring, Cast Steel1This standard is issued under the fixed designation F2936; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of las
2、t revision. 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 closed chocks for installation on ships used formoorin
3、g.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 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.2. Ref
4、erenced Documents2.1 ASTM Standards:2A27/A27M Specification for Steel Castings, Carbon, forGeneral Application2.2 ANSI Standard:B 46.1 Surface Texture33. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 bulwarka structural enclosure along the edge of theship to serve as a rail.3.1
5、.2 closed chocka metal flared ring-like fitting mountedon a ship, through which mooring lines pass to moor a ship.3.1.3 mooring ring or pipea chock mounted in the bul-wark and conforming to Type II and IV.3.1.4 rope contact areathat part of the fitting in contactwith the mooring line in normal moori
6、ng operations.4. Classification4.1 The size of the chocks will be identified by the nominalsize “L” and “H” of the opening as shown in Table 1 and Table2.4.2 Chocks are furnished in types as follows:4.2.1 Type IDeck mounted as shown in Fig. 1 andconforming to all dimensions in Table 1.4.2.2 Type IIB
7、ulwark mounted as shown in Fig. 2 andconforming to all dimensions in Table 2.4.2.3 Type IIIDeck mounted, conforming only to dimen-sions “L” and “H” of Table 1 and is of adequate strength to atleast meet 7.2 requirement and the requirements of Sections 6to 10.4.2.4 Type IVBulwark mounted, conforming
8、only to di-mensions “L” and “H” of Table 2 and is of adequate strengthto at least meet 7.2 requirement and the requirements ofSections 6 to 10.4.3 Chocks shall be furnished in either of the followinggrades:4.3.1 Grade 1Surface finish shall be in the as castcondition.4.3.2 Grade 2Surface finish in wa
9、y of rope contact shallbe in accordance with 8.2.5. Ordering Information5.1 Orders for chocks under this specification shall includethis standard, date, and the following:5.1.1 Descriptive information (size, material, etc.) of moor-ing lines,5.1.2 Quantity (number) of chocks required,5.1.3 Size (ope
10、ning, L 3 H),5.1.4 Type and grade,5.1.5 Primer and coating, if any (see 8.3), and5.1.6 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 thatstrength of the chock will a
11、t least meet 7.2 requirement, andthat it is suitable for the mooring lines specified in the orderinginformation.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
12、 the thickness in way thereof will be cause forrejection. Smaller defects in way of rope contact shall be1This 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
13、. 1, 2012. Published February 2012.2For 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.3Available from American N
14、ational Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.welded and finished smooth. Where applicable, welding shallbe in accordance with cod
15、e requirements, such as ABS, AWS,and so on, and may require post weld heat treatment (PWHT).6.4 All excess material, vents, 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
16、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 and Table 2.7. Strength Requirements7.1 The closed chocks are to be designed to withstand thehorizontal and vertical load cases. Horizontal and verticalloadings were considered i
17、ndividually; both loadings were notconsidered simultaneously.7.1.1 Case 1Horizontal loading (see Fig. 3).7.1.2 Case 2Vertical loading (see Figs. 4-6).7.2 The combined stress is limited to 85 % of the yieldstress of the material.8. Workmanship, Finish, and Appearance8.1 Casting shall be sand, grit, o
18、r 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.8.2 The surface of Grade 2 chocks shall have a line contactsurface of average surface roughness of 3 m or less, inaccordance withANSI standard B 4
19、6.1 so as to reduce abrasivedamage to fiber and synthetic ropes.8.3 The manufacturer shall provide surface preparation andcoating as specified by the ordering information. In the absenceof such requirements surface preparation shall remain asrequired by 8.1.9. Inspection9.1 The manufacturer shall vi
20、sually inspect the chock fordimensions, workmanship, finish, and appearance after thepreparation required in 8.1 to ascertain that it meets the intentof this specification.10. Product Marketing10.1 Each chock shall be marked with purchase order, itemnumber, and stamped on the top exposed web using l
21、etters atleast 12 mm high designating the ASTM standard number,type, and grade. Other markings may be in paint or awaterproof tag.11. Packaging and Package Marking11.1 If shipment is required, chocks shall be crated orattached to a pallet in a manner acceptable for shipment by acommon carrier.TABLE
22、1 Dimension Requirements (see Fig. 1)(Units: mm)Nominal sizeL3H3Dl1l2l3l4H1H2H3RR1R2R325032003214 488 453 76 265 427 368 108 100 219 160 10830032503286 614 565 89 330 551 481 144 125 282 212 14435032503333 716 660 114 403 601 525 168 125 308 232 16840032503381 820 754 139 475 652 553 192 125 335 236
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