© Edwards Limited 2007. All rights reserved. Page 19
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Maintenance
A371-32-880 Issue C
5Maintenance
5.1 Safety information
z A suitably trained and supervised technician must maintain the pump. Obey your local and national safety
requirements.
z 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.
z Allow the pump to cool to a safe temperature before you start maintenance work.
z Isolate the pump and other components in the pumping system from the electrical supply so that they can
not be operated accidentally.
z After maintenance is completed, recheck the pump rotation direction if the electrical supply has been
disconnected.
z Do not reuse o-rings and seals if they are damaged.
z The pump and its fluid will be contaminated with the process chemicals that have been pumped during
operation. Ensure that the pump is decontaminated before maintenance and that you take adequate
precautions to protect people from the effects of dangerous substances if contamination has occurred.
z Do not touch or inhale the thermal breakdown products of fluorinated materials which may be present if the
pump has been heated to 260 °C (500 °F) and above. These breakdown products are very dangerous.
Fluorinated materials in the pump may include oils, greases and seals. The pump may have overheated if it
was misused, if it malfunctioned or if it was in a fire. Edwards Material Safety Data Sheets for fluorinated
materials used in the pump are available on request: contact your supplier or Edwards.
z Leak-test the system after maintenance work is complete if you have connected or disconnected any vacuum
or exhaust joints; seal any leaks found.
5.2 Maintenance plan
The plan shown in Ta b le 4 details the routine maintenance operations necessary to maintain the pump in normal use.
Instructions for each operation are given in the section shown.
More frequent maintenance may be required if the pump is used to process corrosive or abrasive gases and vapours;
in these circumstances, we recommend that you replace the pump seals every year. If necessary, adjust the
maintenance plan according to your experience.
When you maintain the pump, use Edwards spares and maintenance kits; these contain all of the components
necessary to complete maintenance operations successfully. The Item Numbers of the spares and kits are given in
Section 7.
Examine the condition of any external accessories, filters or traps (if fitted). Refer to the instructions supplied with
these accessories for maintenance procedure.
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