© Edwards Limited 2013. All rights reserved. Page 45
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Operation
A708-01-880 Issue E
4.3.3 Shut down the pump
If the pump is operating in an ambient temperature between -20 and -5 °C (-4 and 23 °F), Edwards recommends
that the pump is never shut down, other than for maintenance. If doubts about this, contact Edwards for advice.
Purge the pump before shutting it down. If not, process vapours may condense in the pump and corrode or
damage the pump.
Note: If the pump will be shut down for a long time in an environment where the temperature is close to freezing,
Edwards recommends draining the cooling water from the pump to prevent damage to the pump: refer to
Section 6.1.
1. Isolate the pump inlet from the process gases.
2. Purge the pump of contaminants and potentially damaging vapours. Use one of the following methods:
z Operate the pump for at least 45 minutes.
z Operate the pump at or close to atmospheric pressure for at least 15 minutes.
z Operate the pump with full inlet purge (if fitted) for at least 15 minutes.
z Operate the pump with full gas ballast (if fitted) for at least 15 minutes.
3. Switch off the pump.
4. When the pump has cooled down, turn off the cooling water supply and the shaft-seals purge gas supply.
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