1、Petroleum and natural gas industries Site-specific assessment of mobile offshore units Part 1: Jack-upsCAN/CSA-Z19905-1:13(ISO 19905-1:2012, MOD)National Standard of CanadaNOT FOR RESALE. / PUBLICATION NON DESTINE LA REVENTE.Legal Notice for StandardsCanadian Standards Association (operating as “CSA
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20、sionen franais ds quelle sera produite par lorganisme rdacteur.TMA trade-mark of the Canadian Standards Association, operating as “CSA Group”National Standard of CanadaPublished in March 2013 by CSA GroupA not-for-profit private sector organization5060 Spectrum Way, Suite 100, Mississauga, Ontario,
21、Canada L4W 5N61-800-463-6727 416-747-4044Visit our Online Store at shop.csa.caPrepared byInternational Organization for StandardizationApproved byStandards Council of CanadaCAN/CSA-Z19905-1:13Petroleum and natural gas industries Site-specific assessment of mobile offshore units Part 1: Jack-upsRevie
22、wed byCAN/CSA-Z19905-1:13Petroleum and natural gas industries Site-specificassessment of mobile offshore units Part 1: Jack-upsCSA/4 2013 CSA Group March 2013CAN/CSA-Z19905-1:13Petroleum and natural gas industries Site-specific assessment of mobile offshore units Part 1: Jack-upsCSA PrefaceThis is t
23、he first edition of CAN/CSA-Z19905-1, Petroleum and natural gas industries Site-specific assessment of mobile offshore units Part 1: Jack-ups , which is an adoption, with Canadian deviations, of the identically titled ISO (International Organization for Standardization) Standard 19905-1 (first editi
24、on, 2012-08-01). At the time of publication, ISO 19905-1:2012 is available from ISO in English only. CSA Group will publish the French version when it becomes available from ISO.Standards development within the Canadian Offshore Structures sector is harmonized with international standards developmen
25、t.This Standard was reviewed for Canadian adoption by the harmonized Canadian Advisory Committee and CSA Technical Committee to ISO TC 67/SC 7, Offshore Structures. This Standard has been formally approved by the CSA Technical Committee on Design, Construction, and Installation of Offshore Structure
26、s, under the jurisdiction of the CSA Strategic Steering Committee of Offshore Structures. This Standard has been approved as a National Standard of Canada by the Standards Council of Canada. 2013 CSA GroupAll rights reserved. No part of this publication may be reproduced in any form whatsoever witho
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29、for its improvement will be referred to the appropriate committee. To submit a proposal for change, please send the following information to inquiriescsagroup.org and include “Proposal for change” in the subject line:(a) Standard designation (number);(b) relevant clause, table, and/or figure number;
30、(c) wording of the proposed change; and(d) rationale for the change.CAN/CSA-Z19905-1:13Petroleum and natural gas industries Site-specificassessment of mobile offshore units Part 1: Jack-upsMarch 2013 2013 CSA Group CSA/5Canadian deviations2 Normative referencesAdd the followingThe following National
31、 Standards of Canada, published by CSA Group, are adoptions of ISO Standards. The requirements of these CSA Group Standards shall take precedence over the International Standards on which they are based; any reference within CAN/CSA-Z19905-1 to the International Standard shall be replaced by a refer
32、ence to the equivalent Canadian Standard.CSA Group CAN/CSA-ISO 19900:06 (R2011)Petroleum and natural gas industries Ge neral requirements for offshore structuresCAN/CSA-ISO 19901-1:06 (R2011)Petroleum and natural gas industries Specific requirements for offshore structures Part 1: Metocean design an
33、d operating considerationsCAN/CSA-Z19901-2:07 (R2011)Petroleum and natural gas industries Specific requirements for offshore structures Part 2: Seismic design procedures and criteriaCAN/CSA-Z19902:09Petroleum and natural gas industries Fixed steel offshore structuresCAN/CSA-ISO 19906:11Petroleum and
34、 natural gas industries Arctic offshore structures5 Overall considerations5.1.3 Assessment situations and associated criteriaReplace the second paragraph of this Clause with the followingFor mobile offshore drilling units operating in arctic and cold regions, the requirements of this part of ISO 199
35、05 shall be supplemented with the requirements of CAN/CSA-ISO 19906. Specific consideration shall be given to the following issues:a) prevention of ice interaction with an unprotected riser;b) safe and efficient jack down in the presence of ice;c) local ice actions on the legs from strength and oper
36、ability perspectives;d) vibrations induced by ice interaction with the legs;e) ice impacts with the legs and the influence of waves on ice impact velocities; andf) horizontal loads as a result of ice actions.Mobile offshore drilling units may be treated as multi-leg offshore structures with respect
37、to CAN/CSA-ISO 19906.All principal and companion ice action factors shall be as specified in CAN/CSA-ISO 19906. When ice is the principal action, CAN/CSA-ISO 19906, Clause 7.2.3, shall be used to determine the companion values of the other actions.CAN/CSA-Z19905-1:13Petroleum and natural gas industr
38、ies Site-specificassessment of mobile offshore units Part 1: Jack-upsCSA/6 2013 CSA Group March 2013As permitted by CAN/CSA-ISO 19906, a probabilistic approach may be used to perform a site-specific calibration of environmental action factors. Note: Guidance on calibration of environmental action fa
39、ctors is provided in “Calibration of action factors for ISO 19906 Arctic offshore structures”, OGP Report 422, International Association of Oil it is intended to be used for assessment and not for design. NOTE For the exposure level 1(L1) assessment and, where appropriate, the exposure level 2 (L2)
40、assessment prior to evacuation being effected, this part of ISO 19905 requires the use of 50 year independent or 100 year joint probability metocean extremes, together with associated partial action factors. It is based on extensive benchmarking and best practice in the international community. Site
41、-specific assessment is normally carried out when an existing jack-up unit is to be installed at a specific site. The assessment is not intended to provide a full evaluation of the jack-up; it assumes that aspects not addressed herein have been addressed using other practices and standards at the de
42、sign stage. In some instances, the original design of all or part of the structure could be in accordance with other standards in the ISO 19900 series, and in some cases, different practices or standards could have been applied. The purpose of the site assessment is to demonstrate the adequacy of th
43、e jack-up and its foundations for the assessment situations and defined limit states, taking into account the consequences of failure. It is important that the results of a site-specific assessment be appropriately recorded and communicated to those persons required to know or act on the conclusions
44、 and recommendations. Alternative approaches to the site-specific assessment can be used, provided that they have been shown to give a level of structural reliability equivalent, or superior, to that implicit in this part of ISO 19905. Annex A provides background to and guidance on the use of this p
45、art of ISO 19905. The clause numbering in Annex A is the same as in the normative text in order to facilitate cross-referencing. ISO/TR 19905-2 provides additional background to some clauses and a detailed sample go-by calculation. Annex B summarizes the partial factors. Supplementary information is
46、 presented in Annexes C to H. To meet certain needs of industry for linking software to specific elements in this part of ISO 19905, a special numbering system has been permitted for figures, tables, equations and bibliographic references. In International Standards, the following verbal forms are u
47、sed: “shall” and “shall not” are used to indicate requirements strictly to be followed in order to conform to the document and from which no deviation is permitted; CAN/CSA-Z19905-1:13 ISO 19905-1:2012(E) viii ISO 2012 All rights reserved “should” and “should not” are used to indicate that, among se
48、veral possibilities, one is recommended as particularly suitable, without mentioning or excluding others, or that a certain course of action is preferred but not necessarily required, or that (in the negative form) a certain possibility or course of action is deprecated but not prohibited; “may” is used to indicate a course of action permissible within the limits of the document; “can” and “cannot” are used for statements of possib ility and capability, whether material, physical or causal. CAN/CSA-Z19905-1:13
