© Edwards Limited 2013. All rights reserved. Page 43
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Operation
A708-01-880 Issue E
4 Operation
4.1 Operational safety
The procedures in the following sections assume that there is a pump inlet isolation valve fitted to the pump.
The CDX pump is suitable for handling flammable vapours from gas groups IIA, IIB3 and IIB within
temperature classifications T
1
, T
2
, T
3
and T
4
, depending on the flame arrestor configuration fitted.
If in any doubt, contact Edwards for advice.
If the CDX pump is part of an ATEX Category 1 system, or part of any system which handles
flammable gases in their flammable range, the shaft-seals purge is safety critical, and ensure the
purge supply cannot be interrupted during operation. Refer to the ATEX system instruction manual
for further details.
If the CDX pump is part of an ATEX system, a pump case temperature limit will have been specified
for normal pump operation. (Refer to the ATEX system instruction manual for details.) Ensure that
the pump case temperature is maintained below this limit, otherwise the pump will be switched
off by the ATEX control system.
During operation, parts of the pump can become very hot. Under abnormal conditions, the
temperature of the pump body can reach 115 °C (239 °F). Do not touch the pump.
Do not operate the pump with a coupling cover removed. If so, there will be a danger of injury or
death from the rotating mechanisms.
Do not operate the pump with the pump inlet or pump outlet open to atmosphere. If so, there will
be a danger of injury or death from the rotating mechanisms, from the exposure to vacuum or to
toxic gases, from explosive gases, or from hot exhaust gases.
Take all necessary safety precautions when pumping toxic, flammable or explosive gases. If not,
there will be a danger of injury or death to people.
Do not expose any part of the body to vacuum. If so, there will be danger of injury.
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