QUESTIONS FOR SAFETY RELIEF VALVES
• Set pressure.
• Maximum inlet temperature.
• Allowable over-pressure.
• Service
- Liquid – specific gravity and viscosity where relevant.
- Gas / Vapours – Specific gravity and Molecular weight.
State if a change in phase is possible.
• Back pressure – constant or variable, state level of pressure.
• Required capacity.
• Connections – screwed or flanged (details required).
• Materials of manufacture (body, trim, etc).
• Accessories – e.g. plain cap, open / packed lifting lever, test gag, open vented bonnet, bellows, etc.
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