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Introduction
A708-01-880 Issue E
1.9.3 Abnormal operation: CDX and IDX pumps
z Use of the pump as a positive pressure compressor.
z Use of the pump while subjected to high back-pressure (for example, caused by a blockage in the exhaust
pipeline). Refer to Section 2.2 for the system limitation.
z Pumping gases that cause the inlet flame arrestor (where fitted) or associated pipelines to exceed a surface
temperature of 60 °C (140 °F).
z Pumping of gases with a temperature above 60 °C at the inlet of the pump.
z Reverse rotation of the pump.
z Pumping hydrocarbon oxides.
z Pumping gases that tend to self-decompose, or that are chemically unstable.
z Pumping gases of a higher gas group than allowed by the pumping system certification.
z Pumping of group IIC gases.
z Use of the pump with materials which have auto-ignition temperatures below the defined temperature
rating.
z 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.
z Pumping of, or use of the pump in the presence of, explosive dust atmospheres.
z Use of the pump in ambient conditions other than those specified in Section 2.1.
z Pumping pyrophoric gases.
z Use with oxygen enriched atmospheres.
z Use in an external atmosphere where there is a potentially flammable dust atmosphere.
z Use of the pump in a potentially explosive external atmosphere, unless the pumping system is certified as
compliant with ATEX Directive 94/9/EC (European Union only).
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