RESEARCH REPORT 096 - Health and Safety Executive

1 HSE Health & Safety Executive Accident statistics for fixed offshore units on the UK Continental Shelf 1980 - 2001 Prepared by Det Norske Veritas Industry AS for the Health and Safety Executive 2003 RESEARCH REPORT 096 HSE Health & Safety Executive Accident statistics for fixed offshore units on the UK Continental Shelf 1980 - 2001 Espen Funnemark Det Norske Veritas Industry AS Safety & Process Advisory Services Veritasveien 1 1322 Hovik Norway Eoin Young HSE Offshore Division Room G SW Rose Court London SE1 9HS This project updates previous project; Accident Statistics for Fixed Offshore Units on the UK Continental Shelf, 1991 - 1999.

2 The Health and Safety Executive (HSE) published the project as OTO 2002/012. This project follows the same format for fixed offshore units and extends the data coverage to 21 years, 1980 - 2001. The work was commisioned by the HSE as it had been noted that event frequencies quoted in the Safety cases of offshore installations tended to be lower than experience would anticipate. It has been noted that extensive use has been made of OTO 2000/012 in Safety cases submitted following publication.

3 Typically a review of relevant incidents has assisted the duty holder in confirming that he has in place adequate mitigating measures. This REPORT and the work it describes were funded by the HSE. Its contents, including any opinions and/or conclusions expressed, are those of the authors alone and do not necessarily reflect HSE policy. HSE BOOKS Crown copyright 2003 First published 2003 ISBN 0 7176 2211 8 All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording or otherwise) without the prior written permission of the copyright owner.

4 Applications for reproduction should be made in writing to: Licensing Division, Her Majesty's Stationery Office, St Clements House, 2-16 Colegate, Norwich NR3 1BQ or by e-mail to ii Table of Contents 1 2 3 4 5 6 7 8 Page Executive SUMMARY.

5 1 Introduction and background 1 Confidentiality 1 Objectives, results and conclusions 2 INTRODUCTION .. 7 OBJECTIVES AND SCOPE OF 9 EXPOSURE 11 ORION 13 Available data 13 incident category codes 14 Dangerous occurrence type codes 14 Broad incident type codes 15 Event classification and coding principles 16 Result of interrogation All fixed units Drilling units Production units Wellhead units Compression units

6 Pumping units Injection/riser units Accommodation units 18 25 29 30 34 38 42 42 43 WOAD .. 45 Available data Result of interrogation All fixed units Drilling units Production units Wellhead units Compression units Pumping units Injection/riser units Accommodation units 45 46 52 55 56 60 60 61 61 61 BLOWOUT DATABASE.

7 63 ACCIDENT STATISTICS .. 65 Accident frequencies, All databases combined 65 Occurrence frequencies, ORION&WOAD 67 All fixed units 69 Drilling units 72 iii Production units 73 Wellhead units 77 Compression units 81 Pumping units 84 Injection/riser units 84 Accommodation units 84 Frequencies.

8 Fixed units on NCS 86 9 87 10 REFERENCES .. 89 Appendix A HSE ORION; DANGEROUS OCCURRENCE TYPE CODES This REPORT is part 1 of the published data. Part 2 is the associated spreadsheet listing individually the coding and text for each incident . iv 1 Executive SUMMARY Introduction and background In 1999, a project was initiated for the purpose of obtaining accident statistics for offshore floating units on the UK Continental Shelf (UKCS).

9 In this respect, five databases holding information about incidents having occurred on floating units on the UKCS were interrogated. The survey revealed that that none of them had a complete recording of such incidents. Consequently, the event frequencies being obtained varied with the availability of sources. There was no reason to believe that the situation and figures for fixed installations should be any different. Hence, it was proposed to initiate a similar type of project, but addressing all types of risks to fixed units.

10 It should be noted that fixed units in this project are defined as comprising all bottom-fixed structures, but excluding TLPs, FPSOs, FSUs and production jackups even though they are fixed during their production phase. Accident statistics for the excluded units are found in HSE s OTO REPORT No. 2000/091 Accident Statistics for Floating Offshore Units on the UK Continental Shelf in 1980-98 . Initially, the proposed project for fixed units was to address the whole period 1980-2001, but since it was realised that accidents from the period 1980-90 held by the former Sun Safety System had not been transferred to the ORION database, the project was therefore limited to cover 1991-99.