5.6.2 Gas purges
WARNING:
If inert gas pur
ges 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 aer
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 condensaon
or may be carried over from the process.
When calculang the ow rate of inert gas required for diluon, 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.
Connually 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.
5.7 Leak test the dry pumping system
WARNING:
Leak tes
t the dry pumping system aer installaon and seal any leaks found to
prevent leakage of dangerous substances out of the dry pumping system and leakage
of air into the dry pumping system.
Note:
For further
informaon on the leak tesng, contact us or the supplier for advice.
07/2021 - ©Edwards Limited
Page 39A41870880_A
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