Edwards A705-41-000, Instruction Manual

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Maintenance
A705-40-880 Issue B
5 Maintenance
5.1 Safety

Ensure that the ambient atmosphere around the pump is not flammable before you start maintenance.

A suitably trained and supervised technician must maintain the pump.

Ensure that the maintenance technician is familiar with the safety procedures which relate to the synthetic
oils and greases used and the products pumped. Wear the appropriate safety-clothing when you come into
contact with contaminated components, grease and pump oil. Dismantle and clean contaminated
components inside a fume-cupboard.

Use suitable lifting equipment and wear safety shoes when you replace the pump-motor.

Allow the pump to cool for at least three hours before you start maintenance work.

Isolate the pump and other components in the process system from the electrical supply so that they cannot
be operated accidentally.

Recheck the pump rotation direction if the electrical supply has been disconnected.

Do not reuse O-rings or gaskets if they are damaged.

Protect sealing-faces from damage.

Do not touch or inhale the thermal breakdown products of fluorinated materials which may be present if the
pump has overheated to 260 °C and above. These breakdown products are very dangerous. 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 the fluorinated materials used in the pump are available on request: contact your supplier or
Edwards.

Leak-test the system after installation work is complete and seal any leaks found to prevent leakage of
dangerous substances out of the system and leakage of air into the system: refer to
Section 3.11 .
5.2 Maintenance plan
The plan in Table 14 details the maintenance operations required to maintain the pump in normal operation.
Instructions for each operation are given in the Section shown. In practice, the frequency of maintenance is
dependent on your process. In clean processes, you may be able to decrease the frequency of maintenance
operations; in harsh processes you may have to increase the frequency of maintenance operations. Adjust the
maintenance plan according to your experience.
When you maintain the pump, use Edwards maintenance and service kits. These contain all of the necessary seals,
lubricating grease and other components necessary to complete maintenance operations successfully. The Item
Numbers of these kits are given in
Table 18 .
WARNING
Obey the safety instructions given below and take note of appropriate precautions. If you do not,
you can cause injury to people and damage to equipment.
WARNING
If your EDP pump is part of an ATEX system, you must maintain the pump using the schedule given
in
Table 14 , and as described in Section 5.3 to 5.16 of this manual for the ATEX certification to
remain valid.