API-Rp f110 2007-10

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  1. 1. RECOMMENDED PRACTICE DET NORSKE VERITAS DNV-RP-F110 GLOBAL BUCKLING OF SUBMARINE PIPELINES STRUCTURAL DESIGN DUE TO HIGH TEMPERATURE/HIGH PRESSURE OCTOBER 2007
  2. 2. Comments may be sent by e-mail to rules@dnv.com For subscription orders or information about subscription terms, please use distribution@dnv.com Comprehensive information about DNV services, research and publications can be found at http://www.dnv.com, or can be obtained from DNV, Veritas- veien 1, NO-1322 Hvik, Norway; Tel +47 67 57 99 00, Fax +47 67 57 99 11. Det Norske Veritas. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, including pho- tocopying and recording, without the prior written consent of Det Norske Veritas. Computer Typesetting (FM+SGML) by Det Norske Veritas. Printed in Norway If any person suffers loss or damage which is proved to have been caused by any negligent act or omission of Det Norske Veritas, then Det Norske Veritas shall pay compensation to such person for his proved direct loss or damage. However, the compensation shall not exceed an amount equal to ten times the fee charged for the service in question, provided that the maximum compen- sation shall never exceed USD 2 million. In this provision "Det Norske Veritas" shall mean the Foundation Det Norske Veritas as well as all its subsidiaries, directors, officers, employees, agents and any other acting on behalf of Det Norske Veritas. FOREWORD DET NORSKE VERITAS (DNV) is an autonomous and independent foundation with the objectives of safeguarding life, prop- erty and the environment, at sea and onshore. DNV undertakes classification, certification, and other verification and consultancy services relating to quality of ships, offshore units and installations, and onshore industries worldwide, and carries out research in relation to these functions. DNV Offshore Codes consist of a three level hierarchy of documents: Offshore Service Specifications. Provide principles and procedures of DNV classification, certification, verification and con- sultancy services. Offshore Standards. Provide technical provisions and acceptance criteria for general use by the offshore industry as well as the technical basis for DNV offshore services. Recommended Practices. Provide proven technology and sound engineering practice as well as guidance for the higher level Offshore Service Specifications and Offshore Standards. DNV Offshore Codes are offered within the following areas: A) Qualification, Quality and Safety Methodology B) Materials Technology C) Structures D) Systems E) Special Facilities F) Pipelines and Risers G) Asset Operation H) Marine Operations J) Wind Turbines Amendments and Corrections This document is valid until superseded by a new revision. Minor amendments and corrections will be published in a separate document normally updated twice per year (April and October). For a complete listing of the changes, see the Amendments and Corrections document located at: http://webshop.dnv.com/global/, under category Offshore Codes. The electronic web-versions of the DNV Offshore Codes will be regularly updated to include these amendments and corrections.
  3. 3. DET NORSKE VERITAS Recommended Practice DNV-RP-F110, October 2007 Introduction Page 3 Acknowledgement This Recommended practice is based upon a project guideline developed within the Joint Industry Research and Development Project Hotpipe. The work has been performed by Statoil, Snamprogetti and DNV. Sponsors of the project are shown in the table below: DNV is grateful for valuable discussions, cooperation and dis- cussions with these companies. Their individuals are hereby acknowledged for their contribution. During the official hearing of this RP the following companies are acknowledged for their valuable input: Acergy Reinertsen Engineering Saipem Xodus Subsea Europipe. Project sub-projects and sponsors Phase 1 Phase 2 Finalisation Task Main Contractor Task Main Contractor Task Main Contractor 1 Pipe Capacity Snamprogetti 1 Analysis of documents Axial Capacity evaluation Snamprogetti 2 Pipeline Response Snamprogetti 2 Workshop High strength low cycle fatigue test of Cr13 Sintef 3 Mitigation Measures Snamprogetti 3 Capacity Snamprogetti Guideline finalisation DNV 4 Design Guideline DNV 4 Response of exposed lines on un-even seabed Snamprogetti 5 Response of buried lines DNV/Statoil 6 Guideline preparation DNV Statoil, Norsk Agip Statoil, Norsk Agip, Shell Statoil, ENI Norge, Shell, BP, Hydro
  4. 4. DET NORSKE VERITAS Recommended Practice DNV-RP-F110, October 2007 Page 4 Introduction
  5. 5. DET NORSKE VERITAS Recommended Practice DNV-RP-F110, October 2007 Page 5 CONTENTS 1. GENERAL .............................................................. 7 1.1 Introduction .............................................................7 1.2 Objective...................................................................7 1.3 Scope and Application.............................................7 1.4 Structure of Recommended Practice.....................7 1.5 Relationships to other Codes..................................8 1.6 Referenced codes .....................................................8 1.6.1 DNV Offshore Services Specifications ..............................8 1.6.2 DNV Offshore Standards....................................................8 1.6.3 DNV Recommended Practices ...........................................8 1.6.4 Other codes.........................................................................8 1.7 Definitions ................................................................8 1.8 Abbreviations...........................................................9 1.9 Symbols.....................................................................9 1.9.1 Latin characters...................................................................9 1.9.2 Greek characters ..............................................................10 1.9.3 Subscripts..........................................................................10 1.10 Units........................................................................10 2. DESIGN SCENARIOS ........................................ 10 2.1 Global Buckling .....................................................10 2.2 Design Flow............................................................12 2.2.1 General..............................................................................12 2.2.2 Scenario I. Pipeline exposed on even seabed ...................12 2.2.3 Scenario II. Pipeline exposed on Un-even seabed............13 2.2.4 Scenario III. Buried pipeline.............................................14 3. BASIS FOR DESIGN........................................... 15 3.1 General ...................................................................15 3.2 Uncertainties ..........................................................15 3.3 Pipe Geometry .......................................................15 3.4 Pipe Material..........................................................16 3.5 Loads.......................................................................17 3.5.1 General..............................................................................17 3.5.2 Operational data (functional load)....................................17 3.5.3 Trawling loads and frequencies (interference load) .........17 3.5.4 Environmental loads .........................................................18 3.5.5 Load combinations............................................................18 3.6 Time Effects ...........................................................18 4. PIPE-SOIL INTERACTION .............................. 18 4.1 General ...................................................................18 4.2 Vertical Stiffness for Lay-Down...........................19 4.3 Exposed Pipes ........................................................19 4.4 Buried Pipelines.....................................................19 5. LOAD EFFECT CALCULATION..................... 20 5.1 General ...................................................................20 5.2 Load Modelling......................................................20 5.2.1 General..............................................................................20 5.2.2 Effective axial force..........................................................20 5.2.3 Build up of effective axial force.......................................20 5.3 Analytical Methods................................................20 5.3.1 Maximum expansion force ...............................................20 5.3.2 Global lateral buckling, Scenario I...................................21 5.3.3 Upheaval buckling, Scenario III.......................................21 5.4 Detailed FE Analyses.............................................21 5.4.1 General..............................................................................21 5.4.2 Modelling of the as laid configuration..............................22 5.4.3 Pipe-soil interference modelling.......................................22 5.5 Miscellaneous.........................................................23 5.6 Engineering Tools..................................................23 6. I - EXPOSED PIPELINE ON EVEN SEABED................................................................ 23 6.1 Objective and Applicability..................................23 6.2 Design Process .......................................................23 6.3 Step 1: Global Buckling (Pre-buckling) Assessment .............................................................24 6.3.1 Triggering mechanism......................................................24 6.3.2 Step 1a: Global lateral buckling activated by external interference ...................................................24 6.3.3 Step 1b: Global lateral buckling activated by imperfection.............................................