1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 13713:2012Ships and marine technology Ships mooring and towingfittings Mooring chocksBS ISO 13713:2012 BRITISH STANDARDNational forewordThis British Standard is the UK imp
2、lementation of ISO 13713:2012.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
3、purport 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 69745 6ICS 47.020.50Compliance with a British Standard cannot confer immunity fromlegal obligat
4、ions.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 13713:2012 ISO 2012Ships and marine technology Ships mooring and towing fittings Mooring chocksNavires et technol
5、ogie maritime Corps-morts et ferrures de remorquage de navires ChaumardsINTERNATIONAL STANDARDISO13713First edition2012-07-01Reference numberISO 13713:2012(E)BS ISO 13713:2012ISO 13713:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise sp
6、ecified, 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 officeC
7、ase 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 13713:2012ISO 13713:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope 12 Normative references . 13 Terms and definitions
8、 . 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 mooring chocks 7Bibliography .10BS ISO 13713:2012ISO 13713:2012(E)ForewordISO (the Internation
9、al 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 been e
10、stablished 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 standard
11、ization.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 voti
12、ng. 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 such
13、patent rights.ISO 13713 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 13713:2012ISO 13713:2012(E)IntroductionThe mooring chock is a type of ships mooring and towing fitting installed o
14、n the shipside to lead the mooring and towing rope from the ships inboard to outboard.The mooring chocks are normally adopted for ships which use nylon or other synthetic ropes other than wire ropes considering the small bending ratio (for wire ropes see ISO 13729.)The tensile strength of rope is re
15、duced depending on bend radius through the chock in accordance with the rope manufacturers guidelines. ISO 2012 All rights reserved vBS ISO 13713:2012BS ISO 13713:2012Ships and marine technology Ships mooring and towing fittings Mooring chocks1 ScopeThis International Standard specifies the design,
16、size and technical requirements for mooring chocks installed to lead the mooring and towing rope 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, th
17、e latest edition of the referenced document (including any amendments) applies.IMO Circular MSC/Circ.1175, Guidance on shipboard towing and mooring equipment3 Terms and definitionsFor the purpose of this document, the following terms and definitions apply.3.1safe working loadSWLmaximum load in kN on
18、 the rope that should normally be applied in service conditions4 Classification4.1 TypeThe mooring chocks shall be classified by its installation site as follows: Type A Deck-mounted mooring chock; Type B Bulwark-mounted mooring chock.4.2 Nominal sizesThe nominal sizes, L x H of mooring chocks are d
19、enoted by reference to the width and height of the opening of the chock, in millimetres. For the mooring chocks having the same size, the alphabetical character is followed by nominal size for the different safe working load (SWL).The nominal sizes are:250x200, 300x250, 350x250, 400x250, 450x250, 50
20、0x250A, 500x250B5 DimensionsMooring chocks have dimensions and particulars in accordance with Tables 1 and 2, and Figures 1 and 2.INTERNATIONAL STANDARD ISO 13713:2012(E) ISO 2012 All rights reserved 1BS ISO 13713:2012ISO 13713:2012(E)6 MaterialsThe following material shall be used for manufacturing
21、 the mooring chocks: Chock: steel casting material having a yield point of not less than 235 N/mm2or equivalent.The carbon contents of the steel casting are not to be more than 0,23 % considering weldability.7 ConstructionThe foundation of the mooring chocks shall be determined by considering actual
22、 load direction. The foundation and welding connections to the hull shall be guaranteed reliable transmission of the maximum loading of the mooring chocks to hull construction without any plastic deformation or cracks.8 Manufacturing and inspection8.1 All surfaces of the mooring chocks, including we
23、lding, 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 mooring chocks shall be coated externally with an anti-corrosion protective finish.9
24、Marking9.1 The SWL intended for the use of the mooring 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 reinforcement,
25、 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 mooring chock shall be clearly marked with its SWL by weld bead or equivalent. The SWL shall be expressed in tonnes (letter t) and be placed so that it is
26、 not obscured during operation of the fitting.EXAMPLE SWL XXX t9.4 The SWL mark shall be placed on the foundation of the chock or on deck.9.5 The radii of edges and corners not shown in Figures 1 and 2 shall be of minimum 25 mm.2 ISO 2012 All rights reservedBS ISO 13713:2012ISO 13713:2012(E)Dimensio
27、ns in millimetresKey1 mooring chockaAlternative welding method.Figure 1 Type A Deck-mounted mooring chocks ISO 2012 All rights reserved 3BS ISO 13713:2012ISO 13713:2012(E)Table 1 Dimensions and SWL of Type A Deck-mounted mooring chocksDimensions in millimetresNominal sizeL x Hl1l2l3B H1H2R R1R2250x2
28、00 100 250 444 160 377 80 100 197 80300x250 110 300 536 200 468 100 125 243 100350x250 125 350 608 220 489 110 125 254 110400x250 135 400 682 240 511 120 125 266 120450x250 150 450 760 260 535 130 125 280 130500x250A 175 500 832 280 556 140 125 291 140500x250B 175 500 840 280 560 140 125 295 140Nomi
29、nal sizeL x HR3R4R5T T1Welding leg lengthaSWLbCalculated weightc(kg)z1(kN) (t)250x200 46 20 15 34 18 8,5 353 36 73300x250 64 25 20 36 20 9 491 50 121350x250 72 30 20 38 20 9,5 589 60 151400x250 78 30 20 42 23 10,5 736 75 200450x250 80 30 20 50 28 12,5 981 100 280500x250A 88 30 20 52 30 13 1 128 115
30、338500x250B 80 30 20 60 36 15 1 373 140 396aThe welding method may be changed based on the same welding volume/strength.bThe SWLs shown are for reference only. These are based on the loadings as mentioned in Annex A.The “SWL” may be adjusted depending on the actual loading conditions, and the actual
31、 marking shall be agreed between the user and the manufacturer.cThe calculated weight is for reference only.4 ISO 2012 All rights reservedBS ISO 13713:2012ISO 13713:2012(E)Dimensions in millimetresKey1 mooring chock maximum available line leading angle limited by the end of curve surface (for refere
32、nce)aSWL marking.NOTE The SWL mark shall be provided on the chock or on the shell plate near the chock.Figure 2 Type B Bulwark-mounted mooring chocks ISO 2012 All rights reserved 5BS ISO 13713:2012ISO 13713:2012(E)Table 2 Dimensions and SWL of Type B Bulwark-mounted mooring chocksDimensions in milli
33、metres Nominal sizeL x Hl1l2B H1H2C R R1R2250x200 450 398 154 408 327 57 100 200 174300x250 516 460 168 466 387 60 125 233 205350x250 582 520 177 482 395 65 125 241 210400x250 652 588 193 502 412 70 125 251 219450x250 734 662 213 534 433 77 125 267 231500x250A 812 730 237 562 447 82 125 281 240500x2
34、50B 828 750 253 578 466 82 125 289 250Nominal sizeL x HR3T T1Welding leg lengthaSWLbCalculated weightc(kg)z1 z2 (kN) (t)250x200 78 26 20 8 8 353 36 48300x250 85 27 24 8 9,5 491 50 83350x250 90 29 25 9 10 589 60 100400x250 98 34 32 9,5 13 736 75 145450x250 108 41 36 12,5 14,5 981 100 215500x250A 120
35、41 36 12,5 14,5 1 128 115 235500x250B 128 48 41 14,5 16,5 1 373 140 266aThe welding method may be changed based on the same welding volume/strength.bThe SWLs shown are for reference only. These are based on the loadings as mentioned in Annex A.“SWL” may be adjusted depending on the actual loading co
36、nditions, and the actual marking shall be agreed between the user and the manufacturer.cThe calculated weight is for reference only.6 ISO 2012 All rights reservedBS ISO 13713:2012ISO 13713:2012(E)Annex A (informative) Basis for strength assessment of mooring chocksA.1 GeneralThe strength of the moor
37、ing chocks was evaluated by finite element model analysis and determined based on the following design criteria.A.2 LoadingThe mooring chocks shall be designed to withstand the horizontal (Figure A.1) and vertical (Figures A.2 and A.3) load cases.The horizontal and vertical loadings were considered
38、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 mooring chock.Figure A.1 Case 1 Horizontal loading ISO 2012 All rights reserved 7BS ISO 13713
39、:2012ISO 13713:2012(E)A.2.2 Case 2 Vertical loadingKeyP mooring force or towing forceaShip side.NOTE The loads were considered for a rope deflected through the mooring chock, as shown in this figure.Vertical down side: Outboard down 90, Inboard down 30Vertical up side: Outboard up 30, Inboard up 15F
40、igure A.2 Vertical loading for Type A Deck-mounted mooring chocksa) Bulwark-mounted mooring chocks without bulwark inclination8 ISO 2012 All rights reservedBS ISO 13713:2012ISO 13713:2012(E)b) Bulwark-mounted mooring chocks with bulwark inclinationKeyP mooring force or towing forceNOTE The loads wer
41、e considered for a rope deflected as in this figure through the mooring chock.Vertical down side: Outboard down 90, Inboard down is not to be over 65.( = Maximum 30 for instance, at the design bulwark angle of = 55.)Vertical up side: Outboard up 30, Inboard up 15.Figure A.3 Vertical loading for Type
42、 B Bulwark-mounted mooring chocksA.3 Load and stress criterionUnder the SWL, the following stress criterion was adopted: The combined stress is limited to 85 % of the yield stress of the material.A.4 Wear-down allowances and corrosion additionsThe wear-down margin and corrosion margin were already i
43、ncluded in the safety factor. ISO 2012 All rights reserved 9BS ISO 13713:2012ISO 13713:2012(E)Bibliography1 IACS UR A2, Shipboard fittings and supporting hull structures associated with towing and mooring on conventional vessels2 OCIMF, Mooring Equipment Guidelines (MEG3)3 ISO 4990, Steel castings G
44、eneral technical delivery requirements4 ISO 13729, Ships and marine technology Ships mooring and towing fittings Closed chocks10 ISO 2012 All rights reservedBS ISO 13713:2012BS ISO 13713:2012ISO 13713:2012(E) ISO 2012 All rights reservedICS 47.020.50Price based on 10 pagesThis page deliberately left
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