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
23、 19245032503381 870 804 164 524 652 553 192 125 335 236 19250032503381 920 854 189 574 652 553 192 125 335 236 19240032503428 870 796 139 500 701 609 216 125 360 268 21645032503428 920 846 164 550 701 609 216 125 360 268 21650032503428 970 896 189 600 701 609 216 125 360 268 21650034003428 970 896 1
24、76 600 851 759 216 200 435 343 21650032503525A1068 1000 190 652 798 675 264 125 409 286 26450034003525A1068 1000 193 652 948 825 264 200 484 361 26450032503525B1074 1000 176 652 801 680 264 125 412 291 26450034003525B1 074 1 000 179 652 951 830 264 200 487 366 264Nominal sizeL3H3DR4R5R6d1TWelding le
25、g length SWLRope diameter (Recommend) Calculated weight (kg)Cz1kN ton25032003214 86 150 128 108 22 6 226 23 18 7330032503286 118 180 154 144 26 6.5 422 40 24 14235032503333 138 200 170 168 30 7.5 549 56 28 22240032503381 156 250 214 192 36 9 687 70 32 31045032503381 156 250 214 192 36 9 706 72 32 32
26、250032503381 156 250 214 192 36 9 765 78 32 33740032503428 178 250 212 216 38 9.5 883 90 36 43445032503428 178 250 212 216 38 9.5 912 93 36 45250032503428 178 250 212 216 38 9.5 932 95 36 47250034003428 178 250 212 216 38 9.5 893 91 36 52850032503525A224 320 280 264 40 10 1148 117 44 65750034003525A
27、224 320 280 264 40 10 1158 118 44 72450032503525B218 320 274 264 46 11.5 1413 144 44 75350034003525B218 320 274 264 46 11.5 1383 141 44 825ASWLs shown in the Table are for reference only. “SWL” may be adjusted depending on the actual loading conditions, and the actual marking is to be per the agreem
28、entbetween the user and the manufacturer.BRope diameter (Recommend) is only for reference based on bending ratio of rope through the chock is 12 times.CCalculated weight is for reference only.F2936 122TABLE 2 Dimensions Requirement (see Fig. 2)(Units: mm)Nominal sizeL3H3Dl1l2H1H2RR1R2R3R4R5250320032
29、14 516 441 466 306 100 233 153 108 96 15030032503286 638 554 588 410 125 294 205 144 128 18035032503333 736 646 636 449 125 318 224.5 168 150 20040032503381 834 736 684 450 125 342 225 192 172 25045032503381 884 786 684 450 125 342 225 192 172 25050032503381 934 836 684 450 125 342 225 192 172 25040
30、032503428 882 778 732 515 125 366 257.5 216 194 25045032503428 932 828 732 515 125 366 257.5 216 194 25050032503428 982 878 732 515 125 366 257.5 216 194 25050034003428 982 878 882 665 200 441 332.5 216 194 25050032503525 1078 976 828 551 125 414 275.5 264 240 32050034003525 1078 978 978 701 200 489
31、 350.6 264 240 32050032503525 1078 976 828 554 125 414 277 264 238 32050034003525 1078 978 978 704 200 489 352 264 238 320Nominal sizeL3H3DR6d1d2T uWelding leg length SWLRope diameter (Recommend) Calculated weight (kg)Az1z2kN ton25032003214 138 108 80 12 44 6 5 226 23 18 4930032503286 164 144 100 16
32、 44 8 6.5 422 40 24 10035032503333 182 168 120 18 55 9 7 549 56 28 14140032503381 230 192 120 20 47 10 8 687 70 32 18445032503381 230 192 120 20 47 10 8 706 72 32 19450032503381 230 192 120 20 47 10 8 765 78 32 20240032503428 228 216 120 22 56 11 9 883 90 36 26445032503428 228 216 120 22 56 11 9 912
33、 93 36 27650032503428 228 216 120 22 56 11 9 932 95 36 28850034003428 228 216 120 22 56 11 9 893 91 36 31150032503525B296 264 120 24 53 12 9.5 1148 117 44 37950034003525C296 264 120 24 53 12 9.5 1158 118 44 408ACalculated weight is for reference only.BSWLs shown in the Table are for reference only.
34、“SWL” may be adjusted depending on the actual loading conditions, and the actual marking is to be per the agreementbetween the user and the manufacturer.CRope diameter (Recommend) is only for reference based on bending ratio of rope through the chock is 12 times.NOTE 1All fillet radii to be equal to
35、 “t1”.NOTE 2All final products must have a thickness no less than “T”.FIG. 1 Configuration of Deck Mounted ChocksF2936 123NOTE 1All fillet radii to be equal to “t1”.NOTE 2All final products must have a thickness no less than “T”.FIG. 2 Configuration of Bulwark Mounted ChocksNOTE 1The loads were cons
36、idered for a mooring or towing linedeflected 180 (u = 0) through the closed chock.NOTE 2P means mooring force or towing force.FIG. 3 Horizontal LoadingNOTE 1The loads were considered for a mooring or towing linedeflected as above figures through the closed chock.Vertical down side: Outboard down 90,
37、 Inboard down 30Vertical up side: Outboard up 30, Inboard up 15NOTE 2P means mooring force or towing force.FIG. 4 Vertical loading for Type ADeck-mounted closed chocksF2936 124NOTE 1The loads were considered for a mooring or towing linedeflected as above figures through the closed chock.Vertical dow
38、n side: Outboard down 90, Inboard down 30Vertical up side: Outboard up 30, Inboard up 15NOTE 2P means mooring force or towing force.FIG. 5 Vertical loading for Type BBulwark-mounted closedchocks without bulwark inclinationNOTE 1The loads were considered for a mooring or towing linedeflected as above
39、 figures through the closed chock.Vertical down side: Outboard down 90, Inboard down u is not to overthe figures in Table 2.(a: Refer to the examples below for instance, at the design bulwark angleof b = 60)Nominal size (L 3 H 3 D) a (Maximum available angle)250 3 200 3 214 14300 3 250 3 286 14350 3
40、 250 3 333 25400 3 250 3 381 17450 3 250 3 381 17500 3 250 3 381 17400 3 250 3 428 26450 3 250 3 428 26500 3 250 3 428 26500 3 400 3 428 26500 3 250 3 525 23500 3 400 3 525 23500 3 250 3 525 23500 3 400 3 525 23Vertical up side: Outboard up 30, Inboard up 15NOTE 2P means mooring force or towing forc
41、e.FIG. 6 Vertical Loading for Type B Bulwark-mounted ClosedChocks with Bulwark InclinationF2936 125ASTM 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 deter
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