15.24. Bypass for safety/relief valve
The bypass shall be provided for venting the hydrocarbon gas or toxic gas to flare system while plant shutdown or start-up. Provision of bypass shall be as per following criteria:
15.24.1. Vessels
Bypass shall be provided unless otherwise specified in the relevant Company's specifications.
15.24.2. Piping/equipment
• Gas service
1. If there is other purge line to flare on same stream line, bypass is not required for safety/relief valve.
2. In case of no purge line to flare for toxic or flammable hydrocarbon, bypass valve shall be provided. The size of bypass valve and line shall be same as the vent size of piping/equipment.
• Liquid service
Bypass valves are generally not provided for liquid service unless otherwise ...
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