What type of seal system uses pressurized liquid from the seal pot to pressurize the seal in two directions: internally to the process, and externally to the atmosphere?
A. Seal pot
B. Seal flush
C. Tandem seal
D. Double seal
A. Incorrect. Many pumps use a reservoir called a seal pot to contain a secondary seal liquid.
B. Incorrect. A seal flush is a small flow (slip stream) of pump discharge or externally supplied liquid that is routed to the pump’s mechanical seal.
C. Incorrect. A tandem seal has a primary seal and a backup seal.
D. Correct. A double seal uses pressurized liquid from the seal pot to pressurize the seal in two directions: internally to the process, and externally to the atmosphere.
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Figure 41-08
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