Page 120 -

Stuffing Box Sealing

need to make critical positioning
measurements during installation.
The cartridge seal is a completely
self-contained assembly which
includes all the components of the
seal, the gland and the sleeve in
one unit.

As it does not require any critical
installation measurements, it
simplifies the seal installation
procedures while simultaneously
protecting the faces and
elastomers from accidental
damage. It also effectively reduces
the time spent on maintenance by
simplifying seal installation and
change-out procedures. Figure 6.12: Cartridge seal (Reproduced
Cartridge arrangements are with permission of A. W. Chesterton Inc.)
available in almost every type of
seal on the market, and can therefore eliminate the risk factors and the
extra maintenance hours inherent in the use of conventional
component seals.

6.3.9 Double seals
A Double Seal is used instead of a Single Seal when a higher degree of
leakage protection is desired. It comprises two sets of seal faces
combining to increase the security of the environment from the
pumpage. They are most frequently used for volatile, toxic, carcino-
genic, hazardous and poor lubricating liquids.

:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::, ::::::::::::::::::::::::::::::::::::::: ...........

Figure 6.13: Back to back double seal

99