A708-01-880 Issue E
Page 44 © Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Operation
4.2 ATEX system control
If the CDX pump is part of an ATEX system, use the predefined procedures in the ATEX system instruction manual to:
z Start up the system.
z Allow the pump to warm up.
z Shut down the system.
4.3 Non-ATEX system control
4.3.1 Start the pump
1. Use the procedure below to start the pump.
2. Refer to Figure 7. Look at the level of coolant in the coolant level sight-glass (3). If the coolant level is below the
minimum level, refill the pump with coolant: refer to Section 5.5.
3. Check the gearbox oil level: refer to Section 3.5.1.
4. Check the end cover oil level: refer to Section 3.5.2.
5. Turn on the cooling water supply, shaft-seals purge gas supply and exhaust extraction system (if fitted).
6. Check that the pressure of the shaft-seals purge gas supply is correct and adjust if necessary.
7. Switch on the pump.
Note: The pump must be heated to at least +5 °C (41 °F) before starting or rotating the pump.
4.3.2 Allow the pump to warm up
Allow the pump to warm up and use full gas inlet purge and gas ballast (if fitted) before pumping condensable
vapours. If 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.
Without inlet purge, warm-up takes approximately 90 minutes, depending on the ambient temperature.
When the pump has warmed up to its operating temperature, 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.
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