Edwards GXS 750/2600

connecon (at the standard pressure switch or the opon ow meter). Nitrogen and
clean dry air are suitable purge gases for the dry pumping systems. To use a dierent
purge gas, please contact us.
Check visually that the dial pressure gauge and rotameter (if installed) is not damaged
when installing the dry pumping system.
Note:
Refer to Purge data on page 18 for the purge gas supply requirements.
3.4.1 Flammable/pyrophoric materials
WARNING:
Obey the instruc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 the user is 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
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 the responsibility of the
user 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.
▪ Ensure 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. Users may need to consider adding appropriate measures to monitor the
ow of purge gas (for example, external sensors). The dry pumping systems that
are ed with light‑duty gas module must not be used on applicaons pumping
ammable or pyrophoric materials.
For further informaon please refer to publicaon number P40040100, applicaons
note 'Pumping Flammable Gases' P4100090 or contact us.
Page 35
M58800880_H - Installaon