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3. Installation 3.3 Flushed seal arrangements
and pre-start up checks
Step 1
A flushed seal arrangement is fitted in order to cool or clean the seal area.
It is important that:
- The flush is correctly connected (see below).
- A compatible flushing fluid is used and supplied at the correct pressure and flow rate.
- The flush is turned on at the same time/prior to starting the pump, and turned off at the same time/after stopping the
pump.
Pipework & fittings not normally supplied by
pump manufacturer
Check valve
Isolation valve
Flush inlet
Pressure gauge
Double mechanical
seal/packed gland
only
Control valve
Flush outlet -
to waste
Suggested visible indication of flow
Pressure gauge
Step 2
Connecting the flush
The following equipment is strongly recommended when using a flushing system:
- Control valve and pressure gauge, to enable the correct flushing pressure to be obtained and monitored.
- Isolation valve and check valve, so that the flush can be turned off, and to stop any unwanted substances flowing in
the wrong direction.
- A method of visibly indicating flushing fluid flow.
Step 3
Flusing pipework
This suggested arrangement is for single mechanical seals. If
the pump is fitted with double mechanical seals or packed
glands the pressure gauges and control valves should be
fitted on the outlet side of the system.
Control
valve
