16
3.3 Flushing seal arrangement
and pre-start up checks
3. Installation
Step 4
Flushing fluid
The choice of flushing fluid is dependent upon the fluid being pumped and duty conditions i.e. pressure and temperature. Usually
water is used for cooling or flushing water soluble products. For advice on selecting a suitable flushing fluid please contact pump
supplier.
Step 5
Flusing pressure and flow rate
Single mechanical seal 0.5 bar
(7 psi)
maximum. Any further increase in pressure will result in lip seal failure.
Double mechanical seal/flushed packed gland 1.0 bar
(14 psi)
higher pressure than the discharge of the pump. If the discharge
pressure fluctuates set the pressure to suit maximum condition.
The flushing flow rate must be adequate to ensure that the temperature limitation of the seals is not exceeded. Contact your
pump supplier for further information on the recommended flow.
Step 6
Pre-start up checks
- Check the pipework system has been purged to remove debris.
- Check all obstructions have been removed from pipework and pump.
- Check pump connections and pipework joints are tight.
- Check lubrication levels are correct.
- Check seal flushing is connected if applicable.
- Check all safety guards are in place.
