API Plans

Plan 76

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.