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390 Centrifugal Pumps: Design and Application
Figure 17-26. Package seal for refinery service for temperatures below 350°F
(courtesy of John Crane, Inc.).
Figure 17-27. Package metal bellows seal (courtesy of John Crane).
Typical Applications
Mechanical seals are used to seal a wide range of liquids and gases at
various conditions of pressure, temperature, and speed. As seal technol-
ogy advances, progress is being made to move from the traditional con-
tacting seal to what is becoming known as a class of seals referred to as
non-contacting, non-leaking. Certain types of liquids will require the seal
to operate without any appreciable power loss or wear at the seal faces,
Light Hydrocarbon Service
When sealing a light hydrocarbon as a liquid, conventional flat sealing
faces can be considered when the operating conditions do not require the
