Viking Pump TSM280: Duralobe (Discontinued) - Manual (Page 65)

Page : 63
i) Terminology.
a) "Quench"
-
To provide a liquid barrier which is not induced to flow through the seal
area by any external means.
b) "Flush"
-
To provide a liquid barrier which is induced to flow through the seal
area by an external means.
ii) Quench or Flush Media.
The media used for quenching or flushing a seal area must be fully compatible
with the pumped media, and the relevant materials of construction of the
pump.
Special consideration must be given to the temperature limitations of the
media to insure that no hazards are created, e.g. risk of fire or explosion.
iii) Single Mechanical Seal (For Low-Pressure Quench or Flush).
Refer to section 4.3.3.
This seal arrangement requires a supply of media to the outboard side of the
mechanical seal to quench or flush the seal area. The nature of the pumped
media and the specific duty conditions will determine whether a quench or a
flush is required.
A quench provides a static head. The quench media vessel should be
mounted a minimum of 1.5 feet above the pump, preferably directly above the
seal area. The interconnecting pipework should be as straight as possible,
avoiding horizontal runs, and with the minimum number of bends and
restrictions.
For a suitable flush, the media must be supplied at a flowrate of three litres
per minute per shaft seal (0.8 US Gal per min).
Note : The limiting flush or quench pressure in any application is 7 psi.
WARNING
WARNING