ASTM F2936-2012(2018)e1 Standard Specification for Chocks Ship Mooring Cast Steel《铸钢船舶系泊楔的标准规范》.pdf
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1、Designation: F2936 12 (Reapproved 2018)1An 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 revisi
2、on, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1NOTEKeywords section was editorially added in March 2018.1. Scope1.1 This specification covers the principal dime
3、nsions andmaterials of closed chocks for installation on ships used formooring.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
4、asstandard. No other units of measurement are included in thisstandard.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom
5、-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A27/A27M Specification for Steel Castings, Carbon, forGeneral Application2.2 ANSI Standards:3B 46.1 Surface Texture3. Terminology3.1 Definitions of Terms Specific
6、to This Standard:3.1.1 bulwarka structural enclosure along the edge of theship to serve as a rail.3.1.2 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 a
7、nd IV.3.1.4 rope contact areathat part of the fitting in contactwith the mooring line in normal mooring 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:
8、4.2.1 Type IDeck mounted as shown in Fig. 1 andconforming to all dimensions in Table 1.4.2.2 Type IIBulwark 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 m
9、eet 7.2 requirement and the requirements of Sections 6to 10.4.2.4 Type IVBulwark mounted, conforming 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 following
10、grades:4.3.1 Grade 1Surface finish shall be in the as castcondition.4.3.2 Grade 2Surface finish in way 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 informatio
11、n (size, material, etc.) of moor-ing lines,5.1.2 Quantity (number) of chocks required,5.1.3 Size (opening, LH),5.1.4 Type and grade,5.1.5 Primer and coating, if any (see 8.3), and5.1.6 Marking.1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is th
12、e direct responsibility of Subcommittee F25.01 onStructures.Current edition approved March 1, 2018. Published April 2018. Originallyapproved in 2012. Last previous edition approved in 2012 as F2936 12.DOI:10.1520/F2936-12R18E01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, or
13、contact 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.Copyri
14、ght ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of Internation
15、al Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.16. Materials and Manufacture6.1 Material shall be cast steel in accordance with Specifi-cation A27/A27M, Grade 6030.6.2 For Types III and IV the manufacturer shall certify tha
16、tstrength of the chock will at 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 mm2an
17、d a depth of morethan 10 % of the thickness in way thereof will be cause forrejection. Smaller defects in way of rope contact shall bewelded and finished smooth. Where applicable, welding shallbe in accordance with code requirements, such as ABS, AWS,and so on, and may require post weld heat treatme
18、nt (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 water entrapment.6.6 Type I shall be in accordance with Fig. 1 and Table 1.6.7 Typ
19、e 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 individually; both loadings were notconsidered simultaneously.7.1.1 Case 1Horizonta
20、l 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, or shot blasted to a graymetal finish to remove all loose scale. All mold flashing
21、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 46.1 so as to reduce abrasivedamage to fiber and synthetic ropes.8.3 The manufactur
22、er 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 visually inspect the chock fordimensions, workmanship, finish, and appearance after
23、thepreparation required in 8.1 to ascertain that it meets the intentof this specification.TABLE 1 Dimension Requirements (see Fig. 1)(Units: mm)Nominal sizeLHDl1l2l3l4H1H2H3RR1R2R3250200214 488 453 76 265 427 368 108 100 219 160 108300250286 614 565 89 330 551 481 144 125 282 212 144350250333 716 66
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