Recommendations for Relief Valves on Gas Carriers

Издание на английском языке.
Relief valves perform a safety critical function. Proper design and robust maintenance procedures are essential to ensure that this equipment will function as required. The purpose of this document is to provide information to support this goal. This document is the third edition of SIGTTO's guidance on relief valves and it updates the previous edition, An Introduction to the Design and Maintenance of Cargo System Pressure Relief Valves on Board Gas Carriers (1998).

Contents
1 Introduction and Scope
1.1 Introduction
1.2 Scope
2 Relief Valve Types
2.1 Pilot Operated Relief Valves
2.2 Spring Loaded Relief Valves
2.3 Comparison of Pilot Operated and Spring Loaded Relief Valves
2.4 Vacuum Operation of Pilot Operated Relief Valves
3 Relief Valve Requirements
3.1 General Requirements
3.2 Basic Design Requirements
3.3 Installation Design
3.4 Materials
4 Recommendations
4.1 Selection and Design
4.2 Operational
4.3 Maintenance
4.4 Maintenance and Care of Diaphragms
4.5 Routine Testing
4.6 Field Test Kit
5 Operating Problems and Faults
5.1 Operating Problems
5.2 Faults
5.3 Chloride Stress Corrosion Cracking
5.4 Emergency Closure of Relief Valves
Annexes
Annex 1 - Auxiliary Setter Installation Procedure
Annex 2 - Metal to Metal Valve Seats
Annex 3 - Glossary of Terms and Abbreviations
Annex 4 - Reference List