EN – 35
ENOperation
Oxygen pumping
In certain applications, mixtures containing oxygen at different concentrations, or even
pure oxygen, are used.
Oils of mineral origin are combustible. Exposure to pure oxygen at high temperatures
may cause them to self-ignite. In addition, they are highly oxidized during pumping and
quickly lose their lubricating properties.
Mineral oils must not be used for oxygen levels of over 21 % in pumped gases. In this
case, perfluorinated synthetic oils must be used (see page 17).
The use of these oils requires a special pump preparation (see page 42). The pump
must be completely disassembled and all traces mineral oil removed. Flushing the oil
case is not adequate.
Any accumulation of oxygen in the installation should be avoided and the oxygen or
combustible mixture should be diluted with a neutral gas at the exhaust: the gas flow
rate should be 4 times the oxygen flow rate.
Certain combustible or explosive gases require a higher degree of dilution.
Our Support Services and Customer Services can advise you to help solve
problems of this kind.
It is strongly recommended not to use fluids such as tri-aryl-phosphate-ester
which are known to cause accidents.
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