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‐clearance throat
bushing and properly sized orifice.