Description: Plan 13 is recirculation from the seal
chamber or gland through an 1/8” minimum flow
control orifice (when necessary), back to the pump
suction. Standard flush plan for vertical pumps.
Objective: Remove seal generated heat and vent
Advantages: Used in applications where the seal
chamber pressure is greater than suction pressure.
Can reduce the seal chamber pressure when used
along with a close‐clearance throat bushing.