1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 13728:2012Ships and marine technology Ships mooring and towingfittings Panama chocksBS ISO 13728:2012 BRITISH STANDARDNational forewordThis British Standard is the UK impl
2、ementation of ISO 13728:2012.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 69747 0ICS 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 13728:2012 ISO 2012Ships and marine technology Ships mooring and towing fittings Panama chocksNavires et technolog
5、ie maritime Corps-morts et ferrures de remorquage de navires cubiers de PanamaINTERNATIONAL STANDARDISO13728First edition2012-07-01Reference numberISO 13728:2012(E)BS ISO 13728:2012ISO 13728:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherw
6、ise 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 o
7、fficeCase 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 13728:2012ISO 13728:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope 12 Normative references . 13 Terms and defin
8、itions . 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 Panama chocks . 7Bibliography .10BS ISO 13728:2012ISO 13728:2012(E)ForewordISO (the Inte
9、rnational 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
10、 been 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 s
11、tandardization.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 f
12、or 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 al
13、l such patent rights.ISO 13728 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 13728:2012ISO 13728:2012(E)IntroductionThe Panama chock is a type of ships mooring and towing fitting insta
14、lled on the shipside to lead the mooring or towing rope from the ships inboard to outboard.The Panama chocks are normally adopted for ships passing through the Panama Canal which are normally assisted by locomotives using steel towing wire. ISO 2012 All rights reserved vBS ISO 13728:2012BS ISO 13728
15、:2012Ships and marine technology Ships mooring and towing fittings Panama chocks1 ScopeThis International Standard specifies the design, size and technical requirements for Panama chocks suitable for installation on ships passing through the Panama Canal which are normally assisted by locomotives us
16、ing steel towing wires. These chocks meet normal mooring requirements and Panama Canal requirements.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 lates
17、t edition of the referenced document (including any amendments) applies.IMO Circular MSC/Circ.1175, Guidance on shipboard towing and mooring equipmentPanama Canal Requirements OP Notice to shipping N-1-2010 Vessel requirements3 Terms and definitionsFor the purposes of this document, the following te
18、rms and definitions apply.3.1safe working loadSWLmaximum load in kN on the rope that should normally be applied in service conditions4 Classification4.1 TypeThe Panama chock shall be classified by its installation site as follows: Type A Deck-mounted Panama chock; Type B Bulwark-mounted Panama chock
19、.4.2 Nominal sizesThe nominal sizes of Panama chocks are denoted by reference to the width of the opening, in millimetres.The nominal sizes are 310 and 360.5 Dimensions5.1 Panama chocks have dimensions and particulars in accordance with Tables 1 and 2, and Figures 1 and 2.5.2 The minimum opening siz
20、e of Panama chocks is decided as specified in Panama Canal Requirements OP Notice to shipping N-1-2010 Vessel requirements.INTERNATIONAL STANDARD ISO 13728:2012(E) ISO 2012 All rights reserved 1BS ISO 13728:2012ISO 13728:2012(E)6 MaterialsThe following material shall be used for manufacturing the Pa
21、nama 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 Panama chocks shall be determined by considering the actual load
22、direction. The foundation and welding connections to the hull shall be guaranteed reliable transmission of the maximum loading of the Panama chocks to hull construction without any plastic deformation or cracks.8 Manufacturing and inspection8.1 All surfaces of the Panama chocks, including welding, s
23、hall 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 Panama chocks shall be coated externally with an anti-corrosion protective finish.9 Marking9.
24、1 The safe working load (SWL) intended for the use of the Panama 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 Panama chock shall be clearly marked with its SWL by weld bead or equivalent. The SWL shall be expressed in tonnes (letter t) and be located so
26、that it is 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 Figure 1 shall be of minimum 25 mm.2 ISO 2012 All rights reservedBS ISO 13728:2012ISO 13728:2012(E)Dimen
27、sions in millimetresKey1 Panama chockaAlternative welding method.Figure 1 Type A Deck-mounted Panama chock ISO 2012 All rights reserved 3BS ISO 13728:2012ISO 13728:2012(E)Table 1 Dimensions and SWL of Type A Deck-mounted Panama chocksDimensions in millimetresNominal sizeL l1l2l3l4H H1H2R R1R2310 310
28、 708 688 105 310 260 639 541 130 329 231360 360 760 740 130 360 260 640 543 130 330 233Nominal sizeR3R4R5T DWelding leg lengthaSWLbCalculated weightc(kg)z1 (kN)(t)310 142 140 198 32 38 8 471 48 257360 140 138 196 34 40 8,5 687 70 286aThe welding method may be changed based on the same welding volume
29、/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 conditions, and the actual marking shall be agreed between the user and the manufacturer.cThe calculated weight is for reference only.4 ISO
30、2012 All rights reservedBS ISO 13728:2012ISO 13728:2012(E)Dimensions in millimetresKey1 Panama chock maximum available line leading angle limited by the end of curve surface (for reference)NOTE 1 The SWL mark shall be provided on the chock or on the shell plate near the chock.NOTE 2 The radii of edg
31、es and corners not shown in this figure shall be of minimum 25 mm.Figure 2 Type B Bulwark-mounted Panama chocks ISO 2012 All rights reserved 5BS ISO 13728:2012ISO 13728:2012(E)Table 2 Dimensions and SWL of Type B Bulwark-mounted Panama chocksDimensions in millimetresNominal sizeL l1l2H H1H2R R1R2R3R
32、4310 310 720 681 260 670 453 130 335 226,5 149 147360 360 770 733 260 670 456 130 335 228 147 145Nominal sizeR5T D1Welding leg lengthaSWLbCalculated weightc(kg)z1z2z3(kN) (t)310 205 25 31 44 10 6 4 687 70 228360 203 27 33 43 10 6 5 775 79 248aThe welding method may be changed based on the same weldi
33、ng 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 conditions, and the actual marking shall be per the agreement between the user and the manufacturer.cThe calculated weight is for r
34、eference only.6 ISO 2012 All rights reservedBS ISO 13728:2012ISO 13728:2012(E)Annex A (informative) Basis for strength assessment of Panama chocksA.1 GeneralThe Panama chocks were designed in accordance with the technical requirements of the Panama Canal as listed below: Bearing surface radius: not
35、less than 180 mm. Single chock: opening area: min. 650 cm2, 305 230 mm, 45,36 t SWL. Double chock: opening area: min. 900 cm2, 355 255 mm, 64,00 t SWL.The strength of the Panama chocks was evaluated by finite element model analysis and determined based on the design criteria.A.2 LoadingThe Panama ch
36、ocks shall be designed to withstand the horizontal 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 rop
37、e deflected 180 ( = 0) through the Panama chock.Figure A.1 Horizontal loading ISO 2012 All rights reserved 7BS ISO 13728:2012ISO 13728:2012(E)A.2.2 Case 2 Vertical loadinga Ship side.NOTE The loads were considered for a rope deflected through the Panama chock as shown in this figure.Vertical down si
38、de: Outboard down 90 , Inboard down 30 Vertical up side: Outboard up 30 , Inboard up 15 orOutboard up 60 , Inboard up 0 Figure A.2 Vertical loading for Type A Deck-mounted Panama chocksa) Bulwark-mounted Panama chocks without bulwark inclinationNOTE The loads were considered for a rope deflected as
39、through the Panama chock as shown in Figure A.3a).Vertical down side: Outboard down 90 , Inboard down 30 Vertical up side: Outboard up 30 , Inboard up 15 orOutboard up 60 , Inboard up 0 8 ISO 2012 All rights reservedBS ISO 13728:2012ISO 13728:2012(E)b) Bulwark-mounted Panama chocks with bulwark incl
40、inationKeyP mooring force or towing forceNOTE The loads were considered for a rope deflected as through the Panama chock as shown in Figure A.3b).Vertical down side: Outboard down 90 , Inboard down is not over the figures in Table 2.(: Refer to below table for instance, at the design bulwark angle o
41、f = 60)Nominal size(Maximum available angle)310 14360 13Vertical up side: Outboard up 30 , Inboard up 15 orOutboard up 60 , Inboard up 0 Figure A.3 Vertical loading for Type B Bulwark-mounted Panama chocksA.3 Load and stress criterionUnder the SWL, the following stress criterion was adopted: The com
42、bined 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 included in the safety factor. ISO 2012 All rights reserved 9BS ISO 13728:2012ISO 13728:2012(E)Bibliography1 IACS UR A2, Shipboar
43、d fittings and supporting hull structures associated with towing and mooring on conventional vessels2 OCIMF, Mooring Equipment Guidelines (MEG3)3 ISO 4990, Steel castings General technical delivery requirements10 ISO 2012 All rights reservedBS ISO 13728:2012BS ISO 13728:2012ISO 13728:2012(E) ISO 201
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