Internal recirculation from pump to discharge	Recirculation from pump case through strainer, orifice and cooler to mechanical seal.	Recirculation from pump case through orifice to mechanical seal	Recirculation from pump case through cyclone separator delivering clean fluid through cooler to seal and fluid with solids back to pump suction.	Dead-ended blanket See: Seal Pots	External fluid reservoir: non-pressurized: forced circulation See: Seal Pots
Dead-ended seal box with no circulation of flush fluid. Water cooled box jacket and throat bushing required unless otherwise specified.	Recirculation from seal with pumping ring through cooler and back to mechanical seal.	Recirculation from pump case through strainer and orifice seal.	Recirculation from pump case through cyclone separator delivering clean fluid to seal and fluid with solids back to pump suction.	Tapped connections on mechanical seal for users use	External fluid reservoir pressurized; forced circulation See: Seal Pots
	Recirculation from pump case through orifice and cooler to mechanical seal.	Recirculation from seal chamber through orifice and back to pump suction.	Injection to seal from external source of clean fluid.	External fluid quench (steam gas, water, ethylene glycol, etc)	Circulation of clean fluid from an external system