Introduction to the Design and Maintenance of cargo system pressure relief valves onboard gas carriers (eBook)

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Published Date

August 1998


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Introduction to the Design and Maintenance of cargo system pressure relief valves onboard gas carriers (eBook)

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This title supersedes the 1992 "Guidelines on the Maintenance of Pressure Relief on board Gas Carriers" that were developed after an incident involving relief valve failure occurred during the loading of a semi-pressurised LPG carrier.

 

PUBLISHED DATE: AUGUST 1998
No. OF PAGES: 35

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Using an incident that involved relief valve failure during loading of a semi-pressurised LPG carrier as an example, this e-book advises on PRV maintenance and testing, emergency closure and operating problems and faults. The example was with a propane cargo where the PRVs were set to operate at 11 bar gauge. During the final stages of loading, and at a pressure of only 7 bar gauge, one of the two PRVs lifted and failed to re-seat and there were no guidelines available, onboard or at the terminal, on emergency methods of closing the valve. This book is a direct response to that incident.

1. INTRODUCTION

2. REQUIREMENTS FOR PRESSURE RELIEF VALVES

2.1 GENERAL

2.2 VALVE DESIGN REQUIREMENTS

2.3 DESIGN AND INSTALLATION

3. TYPES OF PRESSURE RELIEF VALVES

3.1 PILOT OPERATED VALVES

3.2 SPRING OPERATED PRESSURE RELIEF VALVES

4. PREVENTATIVE AND PLANNED MAINTENANCE PROCEDURES FOR PRESSURE RELIEF VALVES

4.1 SCOPE

4.2 PRESSURE RELIEF VALVE PREVENTATIVE MAINTENANCE PHILOSOPHY

4.3 PRESSURE RELIEF VALVE PREVENTATIVE MAINTENANCE FREQUENCY

4.4 PRESSURE RELIEF VALVE MAINTENANCE AND INSPECTION

4.5 MAINTENANCE AND CARE OF DIAPHRAGMS

4.6 SPARE PARTS

5. EMERGENCY CLOSURE OF PRESSURE RELIEF VALVES

5.1 EMERGENCY CLOSURE

6. OPERATING PROBLEMS AND FAULTS

6.1 OPERATING PROBLEMS

6.2 FAULTS

6.3 CHLORIDE STRESS CORROSION CRACKING

7. IN-SERVICE TESTING

APPENDIX 1 IMO IGC CODE – EXTRACTS FROM CHAPTER 8 CARGO TANK VENT SYSTEMS

APPENDIX 2 DEFINITIONS AND TERMINOLOGY USED IN REGARD TO PRESSURE RELIEF VALVES

APPENDIX 3 METAL TO METAL SEAT VALVES – PRECAUTIONS AND HINTS FOR LAPPING SEATS

APPENDIX 4 PRESSURE LEVELS

APPENDIX 5 FIRE ACTIVATED PRESSURE RELIEF SYSTEMS

REFERENCES

Title: Introduction to the Design and Maintenance of cargo system pressure relief valves onboard gas carriers (eBook)
Number of Pages: 35
Product Code: WS1080EA
ISBN: ISBN 13: 978-1-85609-163-3 (9781856091633), ISBN 10: 1-85609-163-5 (1856091635)
Published Date: August 1998

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