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A705-40-880 Issue B
Page 8
© Edwards Limited 2011. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
1.12.2
Abnormal operation
Use of the EDP pump as a positive pressure compressor.
Use of the EDP pump whilst subjected to high back-pressure (for example, caused by a blockage in the
exhaust pipeline). Refer to
for the system limitation.
Pumping gases that cause the inlet flame arrestor (where fitted) or associated pipelines to exceed a surface
temperature of 40 °C.
Reverse rotation of the EDP pump.
Pumping hydrocarbon oxides.
Pumping gases that tend to self-decompose, or that are chemically unstable.
Use of the EDP pump with materials which have auto-ignition temperatures below the defined temperature
rating.
Operation such that the pump inlet temperature falls below the dew point of a flammable vapour being
pumped. This could lead to condensate that can collect and lead to the risk of corrosion or an ignition
hazard.
Pumping of, or use of the EDP pump in the presence of, explosive dust atmospheres.
Use of the EDP in a system or flammable process that causes the ingress of metallic particles into the pump.
Use of the EDP pump in ambient conditions other than those specified in
Pumping pyrophoric gases.
Use with oxygen enriched atmospheres.
Use in an external atmosphere where there is a potentially flammable dust atmosphere.
Use of the EDP pump in a potentially explosive external atmosphere, unless the pumping system is certified
as compliant with ATEX Directive 94/9/EC (European Union only).
WARNING
Misuse of the EDP pump as described below is strictly prohibited: