Viking Pump TSM275: AL-05 - Manual (Page 16)

Page 16
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 that is induced to flow through the seal area by an
external means.
‘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
ensure that no hazards are created, e.g. risk of fire or explosion.
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 'flush' is
required.
A quench provides a static head. The 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 flow rate of three liters per
minute per shaft seal (0.8 US Gal per min).
Note: The limiting 'flush' or 'quench' pressure in any application is 0.5 bar (7
psi).
WARNING
WARNING