MSL Engineering Limited Platinum Blue House 1St Floor, 18 the Avenue Egham, Surrey, TW20 9AB
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SMR Final Report 121404 Purpose of Issue Rev Date of Issue Author Agreed Approved Issued for information 0 Aug 2004 SM Issued for internal comment 1 November 2004 AFD DJM JB Issued as Final Report 2 December 2004 AFD DJM JB This Final report has been reviewed and approved by the Mineral Management Service. Approval does not signify that the contents necessarily reflect the views and policies of the Service, nor does mention of trade names or commercial products constitute endorsement or recommendation for use. This study was funded by the Mineral Management Service, U.S. Department of the Interior, Washington, D.C., under Contract Number 1435-01-04-CT-35320 ASSESSMENT OF REPAIR TECHNIQUES FOR AGEING OR DAMAGED STRUCTURES Project #502 DOC REF C357R001 Rev 1 NOV 2004 MSL Engineering Limited Platinum Blue House 1st Floor, 18 The Avenue Egham, Surrey, TW20 9AB Tel: +44 (0)1784 439194 Fax: +44 (0)1784 439198 E-mail: [email protected] C357R001Rev 2, December 2004 MMS Project #502 NUMBER DETAILS OF REVISION 0 Issued for information, August 2004 1 Issued for comment, November 2004. Extensive revisions throughout, including restructuring of report. 2 Issued as Final Report, December 2004. Conversion table added, Figure showing clamp details to avoid added, and general editorial revisions. C357R001Rev 2, December 2004 MMS Project #502 Assessment of Repair Techniques for Ageing or Damaged Structures By Dr. Adrian F Dier MSL Services Corporation Final Project Report: ASSESSMENT OF REPAIR TECHNIQUES FOR AGEING OR DAMAGED STRUCTURES MMS Project Number 502 November 2004 C357R001Rev 2, December 2004 i This Final report has been reviewed a nd approved by the Mineral Management Service. Approval does not signify that the contents necessarily reflect the views and policies of the Service, nor does mention of trade names or commercial products constitute endorsement or recommendation for use. For more information contact: MSL Services Corporation 11111 Katy Freeway, Suite 620 Houston, Texas 77079 Or MSL ENGINEERING LIMITED Platinum Blue House 1st Floor, 18 The Avenue Egham, Surrey TW20 9AB United Kingdom November 2004 C357R001Rev 2, December 2004 ii ASSESSMENT OF REPAIR TECHNIQUES FOR AGEING OR DAMAGED STRUCTURES MMS Project #502 Dr A F Dier MSL C357R001Rev 2, December 2004 iii UNITED STATES DEPARTMENT OF THE INTERIOR MINERALS MANAGEMENT SERVICES ASSESSMENT OF REPAIR TECHNIQUES FOR AGEING OR DAMAGED STRUCTURES MMS Project #502 Table of Contents Page No EXECUTIVE SUMMARY .......................................................................................................1 PART I – OVERVIEW AND SELECTION OF SMR SCHEMES/TECHNIQUES................8 1. INTRODUCTION .........................................................................................................9 1.1 Background........................................................................................................9 1.2 Objective and Scope of Work..........................................................................10 1.3 How to Use This Document.............................................................................12 1.4 List of Terms and Abbreviations .....................................................................15 2. PAST, PRESENT AND FUTURE PERSPECTIVES.................................................18 2.1 Assessment Technology...................................................................................18 2.2 SMR Techniques..............................................................................................19 2.3 Diverless SMR.................................................................................................21 3. ASSESSMENT INITIATORS.....................................................................................25 5. SELECTION OF SMR SCHEME & TECHNIQUES.................................................32 5.1 Selection of SMR Scheme ...............................................................................32 C357R001Rev.2 December 2004 Page iv 5.1.1 Remove Damage..................................................................................32 5.1.2 Reduce Loadings..................................................................................33 5.1.3 Localized Strengthening /Modification/Repair....................................33 5.1.4 Global Strengthening/Modification/Repair.........................................34 5.1.5 Total Strengthening/Modification/Repair............................................35 5.2 Selection of SMR Techniques .........................................................................35 PART II – DETAILS OF SMR TECHNIQUES .....................................................................46 6. MEMBER REMOVAL...............................................................................................48 6.1 Description.......................................................................................................48 6.1.1 General.................................................................................................48 6.1.2 Cutting Techniques..............................................................................49 6.2 Limitations .......................................................................................................53 6.3 Design Approach.............................................................................................53 6.4 Fabrication/Installation Issues.........................................................................54 6.5 Previous Offshore Applications.......................................................................55 7. DRY WELDING.........................................................................................................58 7.1 Description of Techniques...............................................................................58 7.1.1 Dry Welding at One Atmosphere ........................................................58 7.1.2 Dry Hyperbaric Welding......................................................................59 7.1.3 Hyperbaric Welding Processes............................................................62 7.2 Limitations .......................................................................................................63 7.3 Design Approach.............................................................................................64 7.4 Fabrication/Installation Issues.........................................................................65 7.5 Previous Offshore Applications.......................................................................66 8. WET WELDING TECHNIQUES...............................................................................72 8.1 Description of Technique.................................................................................72 8.1.1 General.................................................................................................72 8.1.2 Welding Processes...............................................................................73 8.2 Limitations .......................................................................................................75 C357R001Rev.2 December 2004 Page v 8.3 Design Approach.............................................................................................76 8.4 Fabrication/Installation Issues.........................................................................76 8.5 Previous Offshore Applications.......................................................................77 9. STRUCTURAL CLAMPS..........................................................................................84 9.1 Description.......................................................................................................84 9.1.1 Introduction..........................................................................................84 9.1.2 Stressed-Mechanical (Friction) Clamps...............................................85 9.1.3 Unstressed Grouted Clamps/Sleeve Connection .................................87 9.1.4 Stressed Grouted Clamps.....................................................................92 9.1.5 Stressed Elastomer-Lined Clamps .......................................................93 9.1.6 Other Types of Clamps ........................................................................94 9.2 Limitations .......................................................................................................96 9.3 Design Approach.............................................................................................97 9.3.1 General.................................................................................................97 9.3.2 Design Procedure for Stressed Clamps..............................................102 9.3.3 Slip strength formulations..................................................................104 9.3.4 Details to Avoid .................................................................................107 9.5 Previous Offshore Applications.....................................................................110 10. GROUT-FILLING OF MEMBERS..........................................................................114 10.1 Description.....................................................................................................114 10.2 Limitations .....................................................................................................114 10.3 Design Approach...........................................................................................115 10.4