Grundfos NK Serie Notice D'installation Et De Fonctionnement page 21

Back-to-back shaft seals
Pipe connection to
primary shaft seal.
The barrier liquid is directed to the seal faces
of the shaft seals. Both primary and
secondary seals are placed in the seal
chamber
Fig. 3 Connections for barrier liquid of
back-to-back arrangement with
standard seals
Is a barrier liquid available in the application?
Description of the barrier liquid:
_______________________________________________
Chemical composition (if available):
_______________________________________________
Pressure of the barrier liquid:
System requirements for the barrier liquid:
_______________________________________________
_______________________________________________
Does the application require circulation of the barrier liquid?
arrangement)
Comments on circulation for the primary shaft seal:
_______________________________________________
_______________________________________________
326
Pipe connections
to secondary
shaft seal.
Pipe connections to the cartridge seal. The
direction of the barrier liquid depends on the
direction of rotation of the shaft.
Fig. 4 Connections for barrier liquid of
back-to-back arrangement with a
cartridge seal
Yes ____ No ____
____________ ___ [bar]
Yes ____ No ____ (dead-end