Is it necessary to install a downhole safety valve in a subsea ... - NTNU

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Appendix E This appendix presents the four basic sequential steps of a HAZOP according to the IEC 61882 [2]. Figure E-1 illustrates the basic steps. Definition Define scope and objectives Define responsibility Select team Plan the study Collect data Agree style of recording Estimate the time Arrange a schedule Preparation Examination Divide system into parts Select a part and define design intent Identify deviation by using guide-words on each element Identify consequences and causes Identify whether a significant problem exists Identify protection, detection and indicating mechanisms Identify possible remedial/mitigating measures (optional) Agree actions Repeat for each element and then each part of the system Documentation and follow-up Record the examination Sign off the documentation Produce the report of the study Follow up that actions are implemented Re-study any parts of system if necessary Produce final output report Figure E-1 The four basic sequential steps of a HAZOP [2] E-1
Appendix F The guide-words used in the HAZOP analysis provided in this thesis are based on the guide words found in the IEC standard, Hazard and operability studies [2]. Table F-1 present the guide-words. Table F-1 Procedure guide-words used in the HAZOP of this thesis Procedure HAZOP Guide words Guide words Description NO, NOT, DON’T The intended activity does not occur, but no direct substitute activity takes place. MORE A greater activity than intended e.g. force, pressure, weight, reaction and duration. LESS A lesser activity than intended e.g. force, pressure, weight, reaction, and duration. OTHER THAN A totally different activity e.g. “lifts” instead of “roll”. PART OF One or more desired activities are missing e.g. “transfer” instead of “transfer and heat”. REVERSE The logical opposite to the desired activity e.g. reverse chemical reaction, reverse direction of flow. F-1
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Page 69 and 70: APPENDIX A A1 Subsea production sys
Page 71 and 72: A1.3 Well completion A1.3.1 Tubing
Page 73 and 74: A1.5.2 Guidelineless system Several
Page 75 and 76: Appendix B In this appendix a figur
Page 77 and 78: Appendix C Fault trees constructed
Page 79 and 80: Production Wing valve ITL WV Produc
Page 81 and 82: Component: Production Packer Failur
Page 83 and 84: Reliability data dossier Component:
Page 85 and 86: Component: Production wing valve Fa
Page 87: Component: Crossover line Failure r
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Is it necessary to install a downhole safety valve in a subsea ... - NTNU

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