Page 232 - Know and Understand Centrifugal Pumps

Failure Analysis of Mechanical Seals

Environmental controls
Suction bypass
The suction bypass is good for:
Removing heat
Removing suspended solids

t

PUMP
DISCHARGE

Figure 14-14

Be aware that the liquid may vaporize if the fluid's val lor pressure should surpass the
absolute pressure in the seal chamber.
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The external flush
The external flush is good for:

Removing heat
Separating the seal environment from the pumped liquid

1
I his environmental control may also dilute th e pumped product. If the external flush
is water, it may be necessary to evaporate it li iter in a costly posterior process.

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