Plumbing a Mechanical Seal

Both ANSI and API plans for mechanical seals are represented below. We also show examples of mechanical seals seal pots at Seal Pots which are also available for applications where a line of clean flush fluid is not available. Some Plans do not require an external source of seal flush fluid. When it is not possible or desireable to use the system fluid, the plumbing plans below will give you an idea of accepted practices.

Plumbing plan

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Mechanical Seal Plumbing Plans


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


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