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Page 27
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Maintenance
S149-01-880 Issue F
5
Maintenance
5.1
Safety information
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Ensure that maintenance is performed by a suitably trained and supervised technician. Obey local and
national safety requirements.
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Ensure that the maintenance technician is familiar with the safety procedures which relate to the pump oil
and the products processed by the pumping system.
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Check that all the required parts are available and of the correct type before work is started.
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Isolate the pump and other components from the electrical supply so that they cannot be operated
accidentally.
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Allow the pump to cool (so that it is a safe temperature for skin contact) before maintenance work is
started.
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Do not reuse O-rings and seals if damaged.
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After maintenance is complete, recheck the direction of pump rotation if the electrical supply has been
disconnected.
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The pump and pump oil will be contaminated with the process chemicals that have been pumped during
operation. Ensure that the pump is decontaminated before maintenance and that adequate precautions to
protect personnel from the effects of dangerous substances if contamination has occurred.
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Do not touch or inhale the thermal breakdown products of fluorinated materials which may be present if the
pump has been heated to 310 °C (590 °F) and above. Fluorinated materials are safe in normal use but can
decompose into very dangerous substances (which may include hydrofluoric acid) if heated to 310 °C
(590 °F) and above. The pump may have overheated if it was misused or if it was in a fire. Health and Safety
Data sheets for fluorinated materials used in the pump are available on request: contact Edwards or the
supplier.
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If necessary, maintain the motor as specified in the manufacturers information supplied with the motor.
5.2
Leak detection
A leak test should be performed if ultimate vacuum cannot be achieved. A proper leak test will isolate sections of
the piping until the leak-source is found. The standard vacuum piping is shown in
Figure 13
. The use of a leak detector
will speed the process for detecting leaks. Contact a Edwards representative for information.
WARNING
Obey the safety instructions given below and take note of appropriate precautions. If not, injury
to people and damage to equipment can occur.
