A705-40-880 Issue B
Page 32 © Edwards Limited 2011. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Operation
4.3 Non-ATEX system control
4.3.1 Start the pump
Allow the pump to warm up before you pump condensable vapours. If you do not, the vapours may condense in
the pump and corrode or damage the pump.
If your pump is not part of an ATEX system, use the following procedure to start the pump:
1. Check the gearbox oil-level in the sight-glass on the side of the pump: refer to Section 3.5.
2. Turn on your cooling-water supply, shaft-seals purge nitrogen supply and exhaust-extraction system (if fitted).
3. Check that the pressure of the shaft-seals purge nitrogen supply is correct and adjust if necessary: refer to
Section 3.12.3.
4. Switch on the pump.
4.3.2 Allow the pump to warm up
Allow the pump to warm up before you pump condensable vapours. If you do not, the vapours may condense in
the pump and corrode or damage the pump.
Leave the pump to operate (with the inlet isolation-valve closed) to allow the pump to warm up to its operating
temperature, that is, until there is a flow of cooling-water through the heat exchanger:
Without the inlet purge, warm-up takes approximately 45-60 minutes, depending on the ambient
temperature.
With an inlet purge pressure of 50 to 250 mbar (5 x 10
3
to 2.5 x 10
4
Pa, 37.5 to 188 torr), warm-up time can
be reduced to as little as 10 minutes.
Refer to Figure 4. When the pump has warmed up to its operating temperature (indicated by a flow of water in the
cooling-water flow indicator, 11), you may start process pumping.
In the first 30 seconds of pumpdown, open the inlet isolation-valve slowly if there is liquid in the inlet pipeline, in
order to minimize the ingress of liquid (entrained in the process gas stream) into the pump.
During pump warm-up, coolant may drain out of the coolant overflow pipe. Take all necessary
precautions if this may present a hazard.
To Next Page
Loading...
Need help?
General
