BS EN ISO 19901-7-2013 Petroleum and natural gas industries Specific requirements for offshore structures Stationkeeping systems for floating offshore structures and mobile offshor.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 19901-7:2013Petroleum and natural gas industries Specific requirements for offshore structuresPart 7: Stationkeeping systems for floating offshore structures and mobile

2、 offshore unitsBS EN ISO 19901-7:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO19901-7:2013. It supersedes BS EN ISO 19901-7:2005 which iswithdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/525/12, Design of offshore

3、 structures.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by

4、BSI StandardsLimited 2013ISBN 978 0 580 74671 0ICS 75.180.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 May 2013.Amendments issued since publicationDate Tex

5、t affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 19901-7 May 2013 ICS 75.180.10 Supersedes EN ISO 19901-7:2005English Version Petroleum and natural gas industries - Specific requirements for offshore structures - Part 7: Stationkeeping systems for floating offshore structures and m

6、obile offshore units (ISO 19901-7:2013) Industries du ptrole et du gaz naturel - Exigences spcifiques relatives aux structures en mer - Partie 7: Systmes de maintien en position des structures en mer flottantes et des units mobiles en mer (ISO 19901-7:2013)Erdl- und Erdgasindustrie - Spezielle Anfor

7、derungen an Offshore-Anlagen - Teil 7: Betriebssysteme fr das Positionshalten schwimmender Anlagen und mobiler Offshore-Einheiten (ISO 19901-7:2013) This European Standard was approved by CEN on 5 January 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate

8、 the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Stand

9、ard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the nati

10、onal 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, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slo

11、vakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved

12、worldwide for CEN national Members. Ref. No. EN ISO 19901-7:2013: EBS EN ISO 19901-7:2013EN ISO 19901-7:2013 (E) 3 Foreword This document (EN ISO 19901-7:2013) has been prepared by Technical Committee ISO/TC 67 “Materials, equipment and offshore structures for petroleum, petrochemical and natural ga

13、s 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 AFNOR. This European Standard shall be given the status of a national standard, either by publi

14、cation of an identical text or by endorsement, at the latest by November 2013, and conflicting national standards shall be withdrawn at the latest by November 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELE

15、C shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 19901-7:2005. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belg

16、ium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switze

17、rland, Turkey and the United Kingdom. Endorsement notice The text of ISO 19901-7:2013 has been approved by CEN as EN ISO 19901-7:2013 without any modification. BS EN ISO 19901-7:2013ISO 19901-7:2013(E) ISO 2013 All rights reserved iiiContents Page Foreword . vIntroduction . vii1 Scope 12 Normative r

18、eferences 23 Terms and definitions . 24 Symbols and abbreviated terms 74.1 Symbols 74.2 Abbreviated terms . 85 Overall considerations 95.1 Functional requirements. 95.2 Safety requirements 95.3 Planning requirements 105.4 Inspection and maintenance requirements 105.5 Analytical tools 106 Design requ

19、irements . 106.1 Exposure levels . 106.2 Limit states . 116.3 Defining design situations . 116.4 Design situations . 127 Actions 147.1 General . 147.2 Site-specific data requirements . 147.3 Environmental actions on mooring lines 157.4 Indirect actions 168 Mooring analysis . 188.1 Basic consideratio

20、ns 188.2 Floating structure offset . 198.3 Floating structure response . 208.4 Mooring line response 258.5 Line tension . 268.6 Line length and geometry constraints 268.7 Anchor forces 278.8 Typical mooring configuration analysis and assessment 278.9 Thruster-assisted moorings . 288.10 Transient ana

21、lysis of floating structure motions . 299 Fatigue analysis . 309.1 Basic considerations 309.2 Fatigue resistance . 309.3 Fatigue analysis procedure 3210 Design criteria 3710.1 Floating structure offset . 3710.2 Line tension limit . 3810.3 Grounded line length 3810.4 Anchoring systems . 3810.5 Fatigu

22、e safety factor . 4110.6 Corrosion and wear . 4110.7 Clearances . 42BS EN ISO 19901-7:2013ISO 19901-7:2013(E) iv ISO 2013 All rights reserved10.8 Supporting structures .4211 Mooring hardware 4211.1 Mooring line components .4211.2 Winching equipment .4311.3 Monitoring equipment .4312 In-service inspe

23、ction, monitoring and maintenance 4412.1 General 4412.2 Mobile moorings 4412.3 Permanent moorings .4413 Dynamic positioning system 4613.1 Basic considerations .4613.2 Design and analysis 4713.3 Design, test and maintenance 4813.4 Operating personnel 4813.5 Determination of stationkeeping capability

24、4814 Synthetic fibre rope mooring 4814.1 Basic considerations .4814.2 Fibre rope mooring analysis .4914.3 Fatigue analysis .5014.4 Creep analysis 5014.5 Design criteria 5014.6 Model testing 51Annex A (informative) Additional information and guidance .52Annex B (informative) Regional information . 16

25、9Bibliography . 176BS EN ISO 19901-7:2013ISO 19901-7:2013(E) ISO 2013 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 carried o

26、ut 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. ISO c

27、ollaborates 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 International

28、 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. Attention is drawn to the possibility that some of the elemen

29、ts of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 19901-7 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries, S

30、ubcommittee SC 7, Offshore structures. This second edition cancels and replaces the first edition (ISO 19901-7:2005), which has been technically revised. This second edition of ISO 19901-7 includes several major additions and changes, primarily to Annex A (informative). The largest change is the add

31、ition of detailed informative text incorporated directly from API RP 2SK on all types of anchor design. In the first edition of this International Standard, this material was previously addressed only by reference to API RP 2SK. Informative material has also been added from API RP 2SK regarding the

32、analysis and mitigation of vortex-induced motions of large cylindrical hulls. Consequently, the normative text has been modified to remove reference to API RP 2SK and to cross-reference portions of the expanded informative annex. The other significant change is the updating of guidance on polyester

33、rope mooring design to conform to the provisions of the recent amendment to API RP 2SM. The changes include new definitions of stiffness, recognition of effective filter barriers, removal of the prohibition against the rope touching the sea floor, and more detail on minimum tension requirements, amo

34、ng others. Additionally, minor corrections were made to the text in 7.4.4 (Wind actions) and 8.3.4 (Riser considerations), and the terminology “most probable maximum“ has been standardized throughout. Finally, the Norwegian clause of Annex B has been updated at the request of Norway, and a new Canad

35、ian clause has been added. ISO 19901 consists of the following parts, under the general title Petroleum and natural gas industries Specific requirements for offshore structures: g127 Part 1: Metocean design and operating considerations g127 Part 2: Seismic design procedures and criteria g127 Part 3:

36、 Topsides structure g127 Part 4: Geotechnical and foundation design considerations g127 Part 5: Weight control during engineering and construction g127 Part 6: Marine operations g127 Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units BS EN ISO 19901-7:2013ISO 1

37、9901-7:2013(E) vi ISO 2013 All rights reservedThe following parts are under preparation: g127 Part 8: Marine soil investigations ISO 19901 is one of a series of International Standards for offshore structures. The full series consists of the following International Standards: g127 ISO 19900, Petrole

38、um and natural gas industries General requirements for offshore structures g127 ISO 19901 (all parts), Petroleum and natural gas industries Specific requirements for offshore structures g127 ISO 19902, Petroleum and natural gas industries Fixed steel offshore structures g127 ISO 19903, Petroleum and

39、 natural gas industries Fixed concrete offshore structures g127 ISO 19904-1, Petroleum and natural gas industries Floating offshore structures Part 1: Monohulls, semi-submersibles and spars g127 ISO 19905-1, Petroleum and natural gas industries Site-specific assessment of mobile offshore units Part

40、1: Jack-ups g127 ISO/TR 19905-2, Petroleum and natural gas industries Site-specific assessment of mobile offshore units Part 2: Jack-ups commentary and detailed sample calculation g127 ISO 19905-3, Petroleum and natural gas industries Site-specific assessment of mobile offshore units Part 3: Floatin

41、g units1)g127 ISO 19906, Petroleum and natural gas industries Arctic offshore structures 1) Under preparation. BS EN ISO 19901-7:2013ISO 19901-7:2013(E) ISO 2013 All rights reserved viiIntroduction The series of International Standards applicable to types of offshore structure, ISO 19900 to ISO 1990

42、6, constitutes a common basis covering those aspects that address design requirements and assessments of all offshore structures used by the petroleum, petrochemical and natural gas industries worldwide. Through their application, the intention is to achieve reliability levels appropriate for manned

43、 and unmanned offshore structures, whatever type of structure and nature or combination of materials used. It is important to recognize that structural integrity is an overall concept comprising models for describing actions, structural analyses, design rules, safety elements, workmanship, quality c

44、ontrol procedures and national requirements, all of which are mutually dependent. The modification of one aspect of design in isolation can disturb the balance of reliability inherent in the overall concept or structural system. The implications involved in modifications therefore need to be conside

45、red in relation to the overall reliability of all offshore structural systems. The series of International Standards applicable to types of offshore structure is intended to provide wide latitude in the choice of structural configurations, materials and techniques without hindering innovation. Sound

46、 engineering judgement is therefore necessary in the use of these International Standards. This part of ISO 19901 was developed in response to the worldwide offshore industrys demand for a coherent and consistent definition of methodologies to analyse, design and evaluate stationkeeping systems used

47、 for floating production and/or storage platforms of various types (e.g. semi-submersibles, spar platforms, ship-shaped structures) and to assess site-specific applications of mobile offshore units (such as mobile offshore drilling units, pipelay units, construction units). Stationkeeping is a gener

48、ic term covering systems for keeping a floating structure, which is under the constant influence of external actions, on a pre-defined location and/or heading with limited excursions. Stationkeeping systems resist external actions by means of any combination of the following: g127 mooring systems (e

49、.g. spread moorings or single point moorings); g127 dynamic positioning systems (generally consisting of thrusters). The external actions generally consist of wind, wave, current and ice actions on the floating structure, mooring and/or risers. Some background to, and guidance on, the use of this part of ISO 19901 is provided in informative Annex A. The clause numbering in Annex A is the same as in the normative text to facilitate cross-referencing. Regional information, where available, is provided in informative Annex B. BS