Grundfos NK Serie Instrucciones De Instalación Y Mantenimiento página 112

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 connections to
Pipe connection to
secondary shaft seal. The
primary shaft seal. The
liquid is directed to the seal
liquid is directed to the
faces of the secondary
seal faces of the shaft
shaft seal. The secondary
seal. The primary seal is
seal is placed in the seal
placed on the pumped
liquid side. chamber.
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:
More comments/info about your system:
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 ____
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