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API Plans

Plan 14

Description: Plan 14 is recirculation from pump

discharge through a properly sized flow control

orifice (when necessary), to the seal chamber

and from the seal chamber through a properly

sized flow control orifice (when necessary), to

the pump suction. (A combination of Plan 11

and Plan 13)

Objective: Remove seal generated heat and

vent vertical pumps while providing adequate

seal chamber pressure for process vapor margin

and sufficient fluid flow for cooling.

Advantages: Provides pressure and

recirculation inside the seal chamber

to avoid vaporizing liquids when used

along with a close‚Äźclearance throat

bushing and properly sized orifice.