1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 13729:2012Ships and marine technology Ships mooring and towingfittings Closed chocksBS ISO 13729:2012 BRITISH STANDARDNational forewordThis British Standard is the UK impl
2、ementation of ISO 13729:2012.The UK participation in its preparation was entrusted to TechnicalCommittee SME/32/-/4, Ships and marine technology - Outfitting anddeck machinery.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not p
3、urport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 69748 7ICS 47.020.50Compliance with a British Standard cannot confer immunity fromlegal obligati
4、ons.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2012.Amendments issued since publicationDate Text affectedBS ISO 13729:2012 ISO 2012Ships and marine technology Ships mooring and towing fittings Closed chocksNavires et technolog
5、ie maritime Corps-morts et ferrures de remorquage de navires Chaumards fermsINTERNATIONAL STANDARDISO13729First edition2012-07-01Reference numberISO 13729:2012(E)BS ISO 13729:2012ISO 13729:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwis
6、e specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright off
7、iceCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 13729:2012ISO 13729:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope 12 Normative references . 13 Terms and definit
8、ions . 14 Classification 14.1 Type . 14.2 Nominal sizes . 15 Dimensions . 16 Materials . 27 Construction . 28 Manufacturing and inspection . 29 Marking . 2Annex A (informative) Basis for strength assessment of closed chocks . 7Bibliography .10BS ISO 13729:2012ISO 13729:2012(E)ForewordISO (the Intern
9、ational Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has b
10、een established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical sta
11、ndardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for
12、 voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all
13、such patent rights.ISO 13729 was prepared by Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee SC 4, Outfitting and deck machinery.iv ISO 2012 All rights reservedBS ISO 13729:2012ISO 13729:2012(E)IntroductionThe closed chock is a type of ships mooring and towing fitting install
14、ed on the shipside to lead the mooring and towing rope from the ships inboard to outboard.The closed chocks are normally adopted for ships which use wire ropes. The radius of chock surface was designed based on the bending ratio of rope through the chock of not less than twelve times of the wire rop
15、e diameter. ISO 2012 All rights reserved vBS ISO 13729:2012BS ISO 13729:2012Ships and marine technology Ships mooring and towing fittings Closed chocks1 ScopeThis International Standard specifies the design, size and technical requirements for closed chocks installed to lead the mooring and towing r
16、ope of a ship.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.IMO Circular M
17、SC/Circ.1175, Guidance on shipboard towing and mooring equipment3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1safe working loadSWLmaximum load in kN on the rope that should normally be applied in service conditions4 Classification4.1 TypeThe c
18、losed chock is to be classified by its installation site as follows: Type A Deck-mounted closed chock; Type B Bulwark-mounted closed chock.4.2 Nominal sizesThe nominal sizes, L x H x D of closed chocks are denoted by reference to the width and height of the opening and depth of the chock in millimet
19、res. For the closed chocks having the same size, the alphabetical character is followed by nominal size for the different SWL.The nominal sizes are:250x200x214, 300x250x286, 350x250x333, 400x250x381, 450x250x381, 500x250x381, 400x250x428, 450x250x428, 500x250x428, 500x400x428, 500x250x525A, 500x400x
20、525A, 500x250x525B, 500x400x525B5 DimensionsClosed chocks have dimensions and particulars in accordance with Tables 1 and 2, and Figures 1 and 2.INTERNATIONAL STANDARD ISO 13729:2012(E) ISO 2012 All rights reserved 1BS ISO 13729:2012ISO 13729:2012(E)6 MaterialsThe following material is to be used fo
21、r manufacturing the closed chocks: Chock: steel casting material having a yield point of not less than 235 N/mm2or equivalent.The carbon contents of the steel casting shall not be more than 0,23 % considering weldability.7 ConstructionThe foundation of the closed chocks shall be determined by consid
22、ering the actual load direction. The foundation and welding connections to the hull shall be guaranteed reliable transmission of the maximum loading of the closed chocks to hull construction without any plastic deformation or cracks.8 Manufacturing and inspection8.1 All surfaces of the closed chocks
23、 including welding shall be free from any visible flaws or imperfections.8.2 All surfaces in contact with the ropes shall be free from surface roughness or irregularities likely to cause damage to the ropes by abrasion.8.3 The closed chocks shall be coated externally with an anti-corrosion protectiv
24、e finish.9 Marking9.1 The SWL intended for the use of the closed chocks shall be noted in the towing and mooring plan available on board for the guidance of the shipmaster, as specified in MSC/Circ.1175.9.2 The actual SWL on board shall be determined by considering the foundation and under deck rein
25、forcement, and it shall be marked on the towing and mooring plan. The actual SWL shall not be over the SWL indicated in this International Standard.9.3 The closed chocks shall be clearly marked with their SWL by weld bead or equivalent. The SWL shall be expressed in tonnes (letter t) and be placed s
26、o that it is not obscured during operation of the fitting.EXAMPLE SWL XXX t9.4 The SWL mark shall be provided on the foundation of the chock or on deck.9.5 The radii of edges and corners not shown in Figure 1 shall be of minimum 25 mm.2 ISO 2012 All rights reservedBS ISO 13729:2012ISO 13729:2012(E)D
27、imensions in millimetresKey1 closed chockaAlternative welding method.Figure 1 Type A Deck-mounted closed chocks ISO 2012 All rights reserved 3BS ISO 13729:2012ISO 13729:2012(E)Table 1 Dimensions and SWL of Type A Deck-mounted closed chocksDimensions in millimetresNominal sizeL x H x Dl1l2l3l4H1H2H3R
28、 R1R2R3250x200x214 488 453 76 265 427 368 108 100 219 160 108300x250x286 614 565 89 330 551 481 144 125 282 212 144350x250x333 716 660 114 403 601 525 168 125 308 232 168400x250x381 820 754 139 475 652 553 192 125 335 236 192450x250x381 870 804 164 524 652 553 192 125 335 236 192500x250x381 920 854
29、189 574 652 553 192 125 335 236 192400x250x428 870 796 139 500 701 609 216 125 360 268 216450x250x428 920 846 164 550 701 609 216 125 360 268 216500x250x428 970 896 189 600 701 609 216 125 360 268 216500x400x428 970 896 176 600 851 759 216 200 435 343 216500x250x525A 1 068 1 000 190 652 798 675 264
30、125 409 286 264500x400x525A 1 068 1 000 193 652 948 825 264 200 484 361 264500x250x525B 1 074 1 000 176 652 801 680 264 125 412 291 264500x400x525B 1 074 1 000 179 652 951 830 264 200 487 366 264Nominal sizeL x H x DR4R5R6d1TWelding leg lengthaSWLbWire rope diameterc(recommended)Calculated weightd(k
31、g)z1(kN) (t)250x200x214 86 150 128 108 22 6 226 23 18 73300x250x286 118 180 154 144 26 6,5 422 43 24 142350x250x333 138 200 170 168 30 7,5 549 56 28 222400x250x381 156 250 214 192 36 9 687 70 32 310450x250x381 156 250 214 192 36 9 706 72 32 322500x250x381 156 250 214 192 36 9 765 78 32 337400x250x42
32、8 178 250 212 216 38 9,5 883 90 36 434450x250x428 178 250 212 216 38 9,5 912 93 36 452500x250x428 178 250 212 216 38 9,5 932 95 36 472500x400x428 178 250 212 216 38 9,5 893 91 36 528500x250x525A 224 320 280 264 40 10 1 148 117 44 657500x400x525A 224 320 280 264 40 10 1 158 118 44 724500x250x525B 218
33、 320 274 264 46 11,5 1 413 144 44 753500x400x525B 218 320 274 264 46 11,5 1 383 141 44 825aThe welding method may be changed based on the same welding volume/strength.bSWLs shown are for reference only. These are based on the loadings as mentioned in Annex A.“SWL” may be adjusted depending on the ac
34、tual loading conditions, and the actual marking shall be agreed between the user and the manufacturer.cThe wire rope diameter (recommended) is only for reference based on a bending ratio of rope through the chock of 12 times.dThe calculated weight is for reference only.4 ISO 2012 All rights reserved
35、BS ISO 13729:2012ISO 13729:2012(E)Dimensions in millimetresKey1 closed chock maximum available line leading angle limited by the end of curve surface (for reference)aSWL marking.NOTE 1 The SWL mark shall be provided on the chock or on the shell plate near the chock.NOTE 2 The radii of edges and corn
36、ers not shown in this figure shall be of minimum 25 mm.Figure 2 Type B Bulwark-mounted closed chocks ISO 2012 All rights reserved 5BS ISO 13729:2012ISO 13729:2012(E)Table 2 Dimensions and SWL of Type B Bulwark-mounted closed chocksDimensions in millimetresNominal sizeL x H x Dl1l2H1H2R R1R2R3R4R5250
37、x200x214 516 441 466 306 100 233 153 108 96 150300x250x286 638 554 588 410 125 294 205 144 128 180350x250x333 736 646 636 449 125 318 224.5 168 150 200400x250x381 834 736 684 450 125 342 225 192 172 250450x250x381 884 786 684 450 125 342 225 192 172 250500x250x381 934 836 684 450 125 342 225 192 172
38、 250400x250x428 882 778 732 515 125 366 257.5 216 194 250450x250x428 932 828 732 515 125 366 257.5 216 194 250500x250x428 982 878 732 515 125 366 257.5 216 194 250500x400x428 982 878 882 665 200 441 332.5 216 194 250500x250x525A 1 078 976 828 551 125 414 275.5 264 240 320500x400x525A 1 078 978 978 7
39、01 200 489 350.6 264 240 320500x250x525B 1 078 976 828 554 125 414 277 264 238 320500x400x525B 1 078 978 978 704 200 489 352 264 238 320Nominal sizeL x H x DR6d1d2T Welding leg lengthaSWLbWire rope diameterc(recommended)Calculated weightd(kg)z1 z2 (kN) (t)250x200x214 138 108 80 12 44 6 5 226 23 18 4
40、9300x250x286 164 144 100 16 44 8 6,5 422 43 24 100350x250x333 182 168 120 18 55 9 7 549 56 28 141400x250x381 230 192 120 20 47 10 8 687 70 32 184450x250x381 230 192 120 20 47 10 8 706 72 32 194500x250x381 230 192 120 20 47 10 8 765 78 32 202400x250x428 228 216 120 22 56 10 9 883 90 36 264450x250x428
41、 228 216 120 22 56 10 9 912 93 36 276500x250x428 228 216 120 22 56 10 9 932 95 36 288500x400x428 228 216 120 22 56 10 9 893 91 36 311500x250x525A 296 264 120 24 53 10 9,5 1 148 117 44 379500x400x525A 296 264 120 24 53 10 9,5 1 158 118 44 408500x250x525B 294 264 120 26 53 10 10,5 1 413 144 44 405500x
42、400x525B 294 264 120 26 53 10 10,5 1 383 141 44 442aThe welding method may be changed based on the same welding volume/strength.bThe SWLs shown in this table are for reference only. These are based on the loadings as mentioned in Annex A.“SWL” may be adjusted depending on the actual loading conditio
43、ns, and the actual marking shall be as agreed between the user and the manufacturer.cThe wire rope diameter (recommended) is only for reference based on bending ratio of rope through the chock of 12 times.dThe calculated weight is for reference only.6 ISO 2012 All rights reservedBS ISO 13729:2012ISO
44、 13729:2012(E)Annex A (informative) Basis for strength assessment of closed chocksA.1 GeneralThe strength of the closed chocks was evaluated by finite element model analysis and determined based on the following design criteria.A.2 LoadingThe closed chocks shall be designed to withstand the horizont
45、al and vertical load cases.The horizontal and vertical loadings were considered individually, but both loadings were not considered simultaneously.A.2.1 Case 1 Horizontal loadingKeyP mooring force or towing forceNOTE The loads were considered for a rope deflected 180 ( = 0) through the closed chock.
46、Figure A.1 Horizontal loading ISO 2012 All rights reserved 7BS ISO 13729:2012ISO 13729:2012(E)A.2.2 Case 2 Vertical loadingKeyP mooring force or towing forceaShip side.NOTE The loads were considered for a rope deflected as shown in this figure through the closed chock.Vertical down side: Outboard do
47、wn 90 , Inboard down 30 .Vertical up side: Outboard up 30 , Inboard up 15 .Figure A.2 Vertical loading for Type A Deck-mounted closed chocksa) Bulwark-mounted closed chocks without bulwark inclinationNOTE The loads were considered for a rope deflected as shown in Figure A.3a) through the closed choc
48、k.Vertical down side: Outboard down 90 , Inboard down 30 .Vertical up side: Outboard up 30 , Inboard up 15 .8 ISO 2012 All rights reservedBS ISO 13729:2012ISO 13729:2012(E)b) Bulwark-mounted closed chocks with bulwark inclinationKeyP mooring force or towing forceNOTE The loads were considered for a
49、rope deflected as shown in Figure A.3b) through the closed chock.Vertical down side: Outboard down 90 , Inboard down is not to go over the figures in Table 2.(: Refer to below table for instance, at the design bulwark angle of = 60)Nominal sizeL x H x D(Maximum available angle)null250x200x214 14300x250x286 14350x250x333 25400x250x381 17450x250x381 17500x250x381 17400x250x428 26450x250x428 26500x250x428 26500x400x428 26500x250x525A 23500x400x525A 23500x
