1、BSI Standards PublicationPD CEN ISO/TR 19905-2:2013Petroleum and natural gasindustries Site-specificassessment of mobile offshoreunitsPart 2: Jack-ups commentary and detailedsample calculationPD CEN ISO/TR 19905-2:2013 PUBLISHED DOCUMENTNational forewordThis Published Document is the UK implementati
2、on of CEN ISO/TR19905-2:2013. It is identical to ISO/TR 19905-2:2012.The UK participation in its preparation was entrusted to TechnicalCommittee B/525/12, Design of offshore structures.A list of organizations represented on this committee can beobtained on request to its secretary.This publication d
3、oes not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 79678 4ICS 75.180.10Compliance with a British Standard cannot confer immunity fromlegal
4、 obligations.This Published Document was published under the authority of theStandards Policy and Strategy Committee on 31 December 2013.Amendments issued since publicationDate Text affectedTECHNICAL REPORT RAPPORT TECHNIQUE TECHNISCHER BERICHT CEN ISO/TR 19905-2 December 2013 ICS 75.180.10 English
5、Version Petroleum and natural gas industries - Site-specific assessment of mobile offshore units - Part 2: Jack-ups commentary and detailed sample calculation (ISO/TR 19905-2:2012) Industries du ptrole et du gaz naturel - valuation lie au site des units marines mobiles - Partie 2: Complments sur les
6、 plates-formes auto-lvatrices (ISO/TR 19905-2:2012) Erdl- und Erdgasindustrie - Offshore Anlagen; Beurteilung von mobilen Offshore Einheiten bezglich ihres Einsatzgebietes - Teil 2: Hubinseln, Erluterungen (ISO/TR 19905-2:2012) This Technical Report was approved by CEN on 11 May 2013. It has been dr
7、awn up by the Technical Committee CEN/TC 12. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, L
8、uxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Br
9、ussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. CEN ISO/TR 19905-2:2013 EPD CEN ISO/TR 19905-2:2013CEN ISO/TR 19905-2:2013 (E) 3 Foreword This document (CEN ISO/TR 19905-2:2013) has been prepared by Technical Committee ISO
10、/TC 67 “Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries” in collaboration with Technical Committee CEN/TC 12 “Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries” the secretariat of which is held by
11、 AFNOR. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of ISO/TR 19905-2:2012 has been approved by CEN as
12、 CEN ISO/TR 19905-2:2013 without any modification. PD CEN ISO/TR 19905-2:2013ISO/TR 19905-2:2012(E) ISO 2012 All rights reserved iiiContents Page Foreword .v Introduction.vii 1 Scope1 2 References .1 3 Terms and definitions .1 4 Symbols1 4.1 Symbols for Clause 61 4.2 Symbols for Clause 73 4.3 Symbol
13、s for Clause 85 4.4 Symbols for Clause 96 4.5 Symbols for Clause 106 4.6 Symbols for Clause 128 5 Commentary on ISO 19905-1:2012, Clauses 5 and A.5 .8 6 Commentary on ISO 19905-1:2012, Clauses 6 and A.6 .8 TR.6.4.1 Metocean data General8 TR.6.4.2 Waves 8 TR.6.4.3 Current.20 TR.6.4.4 Water depths.20
14、TR.6.4.5 Wind .21 7 Commentary to ISO 19905-1:2012, Clauses 7 and A.7 24 TR.7.1 Scope 24 TR.7.3.2 Hydrodynamic model .24 TR.7.3.2.1.1 Length of members 24 TR.7.3.2.1.2 Spudcan.24 TR.7.3.2.1.3 Shielding and solidification.24 TR.7.3.2.2 “Detailed” leg model .25 TR.7.3.2.3 “Equivalent” leg model .25 TR
15、.7.3.2.3.1 Equivalent drag coefficient25 TR.7.3.2.3.2 Equivalent inertia coefficient.26 TR.7.3.3 Wave and current actions48 TR.7.3.4 Wind actions .57 TR.7.8 Other considerations.57 APPENDIX TR.7.A : Example of equivalent model computations.58 APPENDIX TR.7.B: Comparison cases to assess implications
16、of the ISO 19905-1 formulation .63 APPENDIX TR.7.C: Comparison of test results for chords67 8 Commentary to ISO 19905-1:2012, Clauses 8 and A.8 70 TR A.8.8.6 Derivation of the alternative simplified negative stiffness correction term for P- effects .70 9 Commentary to ISO 19905-1:2012, Clauses 9 and
17、 A.9 77 TR.9.3.6.2 Derivation of the limiting horizontal reaction given in ISO 19905-1:2012, Table A.9.3.7 77 10 Commentary to ISO 19905-1:2012, Clauses 10 and A.10 79 TR.10.4.2.1 Natural period General .79 TR.10.4.2.2 Derivation of Ke, effective stiffness used to calculate the jack-up natural perio
18、d82 TR.10.4.3.3 Hysteretic damping .95 TR.10.4.3.4 Vertical radiation damping in earthquake analysis .96 TR.10.5.3.4 / C.2.4 Guidance on the fourth method of ISO 19905-1:2012, Table A.10.5.1 Application of the drag-inertia method .96 PD CEN ISO/TR 19905-2:2013ISO/TR 19905-2:2012(E) iv ISO 2012 All r
19、ights reserved11 Commentary to ISO 19905-1:2012, Clauses 11 and A.11.96 12 Commentary to ISO 19905-1:2012, Clauses 12 and A.12.96 TR.12.6.2.2 Nominal bending strength 96 TR.12.6.2.2.1 Example .96 TR.12.6.3.2 Background for in interaction equation approach97 13 Commentary to ISO 19905-1:2012, Annex C
20、 .98 TR.C.2.4 Guidance on the fourth method of ISO 19905-1:2012, Table A.10.5.1 Application of the drag-inertia method.98 Annex A (informative) Detailed example calculation.99 Annex B (informative) SIPM “drag-inertia method” for dynamic analysis and estimation of extreme response for jack-ups.266 Bi
21、bliography 295 PD CEN ISO/TR 19905-2:2013ISO/TR 19905-2:2012(E) ISO 2012 All rights reserved vForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carrie
22、d out through ISO technical committees. Each member body interested in a subject for which a technical committee has 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. IS
23、O collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. 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 Internatio
24、nal Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. In exceptional circumstances, when a technical committee h
25、as collected data of a different kind from that which is normally published as an International Standard (“state of the art”, for example), it may decide by a simple majority vote of its participating members to publish a Technical Report. A Technical Report is entirely informative in nature and doe
26、s not have to be reviewed until the data it provides are considered to be no longer valid or useful. 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 patent rights.
27、ISO/TR 19905-2 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 7, Offshore structures. ISO 19905 consists of the following parts, under the general title Petroleum and natural gas ind
28、ustries Site-specific assessment of mobile offshore units: Part 1: Jack-ups Part 2: Jack-ups commentary and detailed sample calculation Technical Report The following part is under preparation: Part 3: Floating units ISO/TR 19905-2:2012 was prepared in 2012 and is referenced as ISO/TR 19905-2:2012.
29、Users are advised, however, that it was published, and only became available, in 2013. ISO 19905 is one of a series of International Standards for offshore structures. The full series consists of the following International Standards: ISO 19900, Petroleum and natural gas industries General requireme
30、nts for offshore structures ISO 19901-1, Petroleum and natural gas industries Specific requirements for offshore structures Part 1: Metocean design and operating considerations ISO 19901-2, Petroleum and natural gas industries Specific requirements for offshore structures Part 2: Seismic design proc
31、edures and criteria ISO 19901-3, Petroleum and natural gas industries Specific requirements for offshore structures Part 3: Topsides structure PD CEN ISO/TR 19905-2:2013ISO/TR 19905-2:2012(E) vi ISO 2012 All rights reserved ISO 19901-4, Petroleum and natural gas industries Specific requirements for
32、offshore structures Part 4: Geotechnical and foundation design considerations ISO 19901-5, Petroleum and natural gas industries Specific requirements for offshore structures Part 5: Weight control during engineering and construction ISO 19901-6, Petroleum and natural gas industries Specific requirem
33、ents for offshore structures Part 6: Marine operations ISO 19901-7, Petroleum and natural gas industries Specific requirements for offshore structures Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units ISO 19901-81), Petroleum and natural gas industries Specifi
34、c requirements for offshore structures Part 8: Marine soil investigations ISO 19902, Petroleum and natural gas industries Fixed steel offshore structures ISO 19903, Petroleum and natural gas industries Fixed concrete offshore structures ISO 19904-1, Petroleum and natural gas industries Floating offs
35、hore structures Part 1: Monohulls, semi-submersibles and spars ISO 19905-1, Petroleum and natural gas industries Site-specific assessment of mobile offshore units Part 1: Jack-ups ISO/TR 19905-2, Petroleum and natural gas industries Site-specific assessment of mobile offshore units Part 2: Jack-ups
36、commentary and detailed sample calculation ISO/TR 19905-31), Petroleum and natural gas industries Site-specific assessment of mobile offshore units Part 3: Floating units ISO 19906, Petroleum and natural gas industries Arctic offshore structures 1) Under preparation. PD CEN ISO/TR 19905-2:2013ISO/TR
37、 19905-2:2012(E) ISO 2012 All rights reserved viiIntroduction The series of International Standards applicable to types of offshore structures, ISO 19900 to ISO 19906, addresses design requirements and assessments for all offshore structures used by the petroleum and natural gas industries worldwide
38、. Through their application, the intention is to achieve reliability levels appropriate for manned and unmanned offshore structures, whatever the type of structure and the nature or combination of the materials used. It is important to recognize that structural integrity is an overall concept compri
39、sing models for describing actions, structural analyses, design or assessment rules, safety elements, workmanship, quality control procedures and national requirements, all of which are mutually dependent. The modification of one aspect of the design or assessment in isolation can disturb the balanc
40、e of reliability inherent in the overall concept or structural system. The implications involved in modifications, therefore, need to be considered in relation to the overall reliability of offshore structural systems. The series of International Standards applicable to the various types of offshore
41、 structure is intended to provide a wide latitude in the choice of structural configurations, materials and techniques without hindering innovation. Sound engineering judgement is therefore necessary in the use of these International Standards. ISO 19905-1 was developed from SNAME T new calculation
42、techniques have been addressed because of improved computational capabilities allowing more complex assessments; gaps that existed in the original SNAME T and changes have been made to align ISO 19905-1 with other standards within the 19900 series. A description of the more important changes, along
43、with the reasoning for the changes, can be found in a series of papers published in 2012 by Offshore Technology Conference. These papers can be of considerable value in helping the analyst, particularly those who are familiar with SNAME T used for airgap calculations Hmpmwave height associated with
44、Hsrp, equivalent to the height between the extreme crest and the following trough Hmoestimate of Hssignificant wave height (metres) Hsscaled significant wave height to be used in irregular seas simulation (metres) Hsrpsignificant wave height for assessment return period k wave number m power constan
45、t in the ()2cosmspreading function Snn(f) power density of wave surface elevation as a function of wave frequency T wave period (seconds) T wind averaging time (seconds) T0 standard reference time averaging interval for wind speed of 1 h = 3 600 s Tppeak period in wave spectrum (seconds) Tzzero-upcr
46、ossing period of wave spectrum (seconds) U wind speed Uw,T(10) is the sustained wind speed at 10 m height above mean sea level Uw0 is the 1 h sustained wind speed at the reference elevation 10 m above mean sea level u the computed velocity for long crested waves uredthe reduced horizontal velocity V
47、 current velocity equilibrium range parameter 3skewness 4kurtosis peak enhancement factor dscaling of drag forces kinematics reduction factor crest elevation by Airy theory PD CEN ISO/TR 19905-2:2013ISO/TR 19905-2:2012(E) ISO 2012 All rights reserved 3screst elevation by Stokes directional spreading
48、 factor defined in ISO 19901-1 spectral peakwidth parameter 4.2 Symbols for Clause 7 A cross-sectional area of member Aeequivalent area of leg per unit height Aiequivalent area of element Assum of projected areas for all members in the considered plane Attotal projected envelope area of the consider
49、ed plane CAadded mass coefficient CDdrag coefficient CDodrag coefficient for chord at direction = 0 CD1drag coefficient for flow normal to the rack, = 90 CDeequivalent drag coefficient CDeiequivalent drag coefficient of member i CDidrag coefficient of an individual member, related to DiCDpr( ) drag coefficient to the projected diameter CDroughdrag coefficient for a rough member CDsmoothdrag coefficient for a smooth m
