Double isolation and emptying

Double isolation and emptying

Jun 13, 2020

Mechanical isolation - Double isolation and emptying

Single valve assembly that seals the pipe by closing the valve on the main line with a relief valve between the valves

Double isolation and empting have two valves closed with a relief valve in the middle

Automatic valves should not be used for isolation. If used, the valve must be closed and then disabled

The pressure relief valve shall be sized to meet the requirements for the maximum possible discharge that can be passed when the isolation valve is closed

Process control valves cannot be used as basic isolation

Main valves shall be identified by a unique code

Lock the valve in the closed position

The vent and relief valve are opened to prevent pressure buildup