27
Flowserve US Inc.
SIHI
dry
dry
dry
dry
Standard
Standard
Standard
Standard M Series
Dry Running Vacuum Pump
Issue Date: November 21, 2016 Copyright:
FLOWSERVE SIHI Pumps Rev 1
3.4 Functional Description Shaft Sealing [Labyrinth Sealing]
In conjunction with the Labyrinth seal, the
purge gas system [see 3.6] is used for
blocking the driving compartment against
the discharge compartment to effectively
ensure that the feeding medium does not
enter the driving compartment.
3.5 Functional Description Labyrinth [Piston Ring Purge]
Figure 10: Piston Ring Purge
In conjunction with the Labyrinth seal, the
piston rings are in addition purged with about
10SLM [2.5CFM] to prevent condensation of
condensable. This dilution effect helps to
avoid that process gas will enter motor casing
in the event of abnormal overpressure from
the discharge.
Figure 9: Shaft Seal Principle
Summary of Contents for SIHI dry Standard H Series
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