Page 405 - Centrifugal Pumps 2E
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370 Centrifugal Pumps: Design and Application
Figure 17-11. Double mechanical seal installation closed loop system with axiat
flow pumping ring (courtesy of John Crane),
Some special applications after periods of shutdown may require that
the process liquid be heated to maintain the product being pumped as a
liquid. In these instances, the stuffing box must be preheated prior to
starting the pump to avoid damage to the seal.
Seat Leakage
An estimate for seal leakage in cubic centimeters per minute can be
made from the following equation:
