API Plans

Plan 72

Description: Plan 72 is an external control system supplying a

“whisper” of BUFFER gas (typically Nitrogen) at less pressure

than the process pressure being sealed, to an Arrangement 2

dual gas seal, with a dry

running containment seal.

Used alone to dilute seal

leakage or in conjunction with

Plan 75 or 76 to help sweep

seal leakage into a closed

collection system.

Objective: To reduce human

and environmental contact in

the event of a primary seal

failure. Remove moisture, filter

the gas and regulate the

pressure to the seal.

Advantages: Zero to very low

process emissions.