Grundfos NK Serie Notice D'installation Et De Fonctionnement page 19

Double shaft seal
solutions
If you chose a tandem or a back-to-back shaft seal
solution, you must connect either a flushing system
or pressurizing system for barrier liquid to the
connection pipes.
Tandem shaft seals
Pipe connection to
primary shaft seal.
The liquid is directed
to the seal faces of
the shaft seal. The
primary seal is
placed on the
pumped liquid side.
Fig. 1 Flushing connections of tandem shaft
seal arrangement with standard seals
Is a flushing liquid available in the application?
Description of the flushing liquid:
Chemical composition (if available):
Pressure of the flushing liquid:
Does the application require flushing/cooling of the primary shaft seal?
Comments on flushing/cooling for the primary shaft seal:
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Pipe connections to
secondary shaft seal.
The liquid is directed
to the seal faces of
the secondary shaft
seal. The secondary
seal is placed in the
seal chamber.
Pipe connections to the
cartridge seal. The direction
of the flushing flow depends
on the direction of rotation
of the shaft
Fig. 2 Flushing connections of tandem shaft
seal arrangement with a cartridge seal
Yes ____ No ____
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Yes ____ No ____