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

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Reliability data dossier Component: Swab valve, annulus swab valve, annulus wing valve and crossover valve Failure rate (10 -6 /hours) Failure mode Data source/comment 4.57 All All failures of gate valves are calculated with a MTBF of 25 years, personal conversation with Marvin Rausand [19]. 2.23 1.67 LCP: 21.76% ITL: 14.74% EXL: 12.26% =48.70% LCP: 21.76% ITL: 14.74% =36.50% 0.56 EXL: 12.26% Recommended values for calculations: Failure rate (10 -6 /hrs): LCP, ITL, EXL: 2.2 LCP, ITL: 1.7 EXL: 0.6 Testing and maintenance: The valves are not tested. A well workover is required for replacement. Failures regarding leakage through the valves and external leakage. The distribution of failure modes is according to those of gate valves in OREDA 97, p 348. Failures regarding leakage through the valves. The distribution of failure modes is according to those of gate valves in OREDA 97, p 348. Failures regarding leakage to the surroundings. The distribution of failure modes is according to those of gate valves in OREDA 97, p 348. Comments and leakage paths: The external leakage of these valves is through the material, actuator or seals and to the surroundings. Internal leakage goes thru the valve. D-7
Component: Crossover line Failure rate (10 -6 /hours) Reliability data dossier Failure mode Data source/comment 0.1 EXL The crossover line is very unlikely to fail. Calculating with a MTBF of approx. 1140 years, personal conversation with Marvin Rausand [19]. Recommended values for calculations: Failure rate (10 -6 /hrs): EXL: 0.1 Testing and maintenance: The crossover line is not tested. Comments and leakage paths: The external leakage of the crossover line will be through the material. D-8
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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: Component: Production wing valve Fa
Page 89: Appendix F The guide-words used in
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Is it necessary to install a downhole safety valve in a subsea ... - NTNU

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