Edwards GXS Series User Manual

3.4.2 Gas purges
WARNING:
If inert gas purges to dilute dangerous gases to a safe level are to be used, ensure that
the pump is shut down if inert gas supply fails.
Switch on the inert gas purge to remove air from the pump and the exhaust pipeline
before the process starts. Switch o the purge ow at the end of the process only aer
the remaining ammable gases or vapours have been purged from the exhaust pipeline.
If liquids that produce ammable vapours could be present in the pump foreline, then
the inert gas purge to the dry pumping system should be le on all the me this liquid is
present. Flammable liquids could be present in the foreline as a result of condensaon
or may be carried over from the process.
When calculang the ow rate of inert gas required for diluon, consider the maximum
ow rate for the ammable gases/vapours that could occur. For example, if a mass ow
controller is being used to supply ammable gases to the process, assume a ow rate for
ammable gases that could arise if the mass ow controller is fully open.
Connually measure the inert gas ow rate. If the ow rate falls below that required,
then the ow of ammable gases or vapours to the pump must be stopped.
Page 36
M58800880_H - Installaon

Edwards GXS Series Specifications

General

Brand	Edwards
Model	GXS Series
Category	Water Pump
Language	English