Description: Plan 76 is a containment seal chamber which allows
venting of non‐condensing leakage from an Arrangement 2 dual
seal, to a flare or vapor recovery system.
Objective: Vent leakage to recovery while monitoring leak rate
by sizing the orifice to allow maximum leakage. Pressure
transmitter will shut down the pump if the leak rate is excessive.
Advantages: Best for processes that
vaporize at ambient temperatures.
Can be used with Plan 72 to sweep
the leakage into the monitoring
system. Is used with contacting or
non‐contacting containment seals.
Lower cost and maintenance than
dual liquid systems.