Edwards EXS Series User Manual

Refer to Rear view on pag
e 12 for the locaon of the purge gas connecon. Nitrogen and
clean dry air are suitable purge gases for the dry pumping systems. To use a dierent
purge gas, contact us.
Check visually that the dial pressure gauge and rotameter (if installed) is not damaged
when installing the dry pumping system.
Note:
Re
fer to Purge data on page 18 for the purge gas supply requirements.
5.6.1 Flammable/pyrophoric materials
WARNING:
Obey the ins
trucons and take note of any precauons given below to ensure that
pumped gases do not enter their ammable ranges.
When ammable or pyrophoric materials are present within the pump there may be
addional risks that you are responsible for assessing and managing as part of the enre
process system installaon. The severity of the risks and the necessary control measures
will depend largely on whether the process system exhaust is in the ammable region, if
this is part of normal operaon, or if it might only occur under rare condions. The
addional risks arise because all dry pumps must be considered as a potenal source of
ignion due to the heat of compression, or possibly fricon. If ignion occurs then the
following may happen:
▪ High pressures could occur within the pump and may not be contained.
▪ A ame front could travel back up the foreline.
▪ A
ame front could travel downstream from the exhaust of the pump.
Industry best pracce suggests that the following measures will reduce the risks of
pumping ammable mixtures and pyrophoric materials, but it is your responsibility to
carry out a risk assessment and take appropriate measures:
▪ Do not allow air to enter the equipment.
▪ Ensure that the dry pumping system is leak‑ght.
▪ Ensur
e that gases in the pump do not enter the ammable range. This may be
achieved by dilung gases in the pump by supplying sucient inert gas purge. For
example, diluon with nitrogen to below one quarter Lower Explosive Limit (LEL)
or, if that is not praccal, to below 60% Liming Oxidant Concentraon (LOC).
▪ The gas module supplied with the pump is not intended to perform a safety
funcon. You may need to consider adding appropriate measures to monitor the
ow of purge gas (for example, external sensors).
For further informaon refer to publicaon number P40040100, applicaons note
'Pumping Flammable Gases' P4100090 or contact us.
07/2021 - ©Edwards Limited
Page 38A41870880_A
A41870880_A - Inst
allaon

Edwards EXS Series Specifications

General

Brand	Edwards
Model	EXS Series
Category	Water Pump
Language	English