Preventive Maintenance Schedule - Edwards EXS Series Instruction Manual

▪ Ensure that the maintenance technician is familiar with the safety procedures
which relate to the products pumped.
▪ Allow the pumps to cool to a safe temperature before fitting lifting brackets or
starting maintenance work.
▪ Vent and purge the dry pumping system before starting any maintenance work.
▪ Isolate the dry pumping system and other components in the process system from
the electrical supply so that they cannot be operated accidentally.
▪ Wait for at least four minutes after switching off the electrical supply before
touching any electrical component on the dry pumping system.
▪ Route and secure cables, hoses and pipelines during maintenance to avoid the
possible risk of trips or entrapment.
▪ The enclosure panels should only be removed when the dry pumping system has
been switched off and allowed to cool sufficiently (as an indication the dry
pumping system should be left for one hour with cooling water still connected with
flow characteristics as defined in
▪ Wear appropriate safety clothing when coming into contact with contaminated
components. Dismantle and clean contaminated components inside a fume
cupboard.
▪ If the cables between a motor and an inverter have been disconnected and refitted
then the pump rotation should be checked.
▪ O-ring replacement intervals vary depending on the application.
▪ Dispose of the components, grease and oil safely.
▪ Take care to protect the sealing faces from damage.
▪ Do not touch or inhale the thermal breakdown products of fluorinated materials
which may be present if the dry pumping system has been overheated to 260 °C
and above. These breakdown products are very dangerous. Fluorinated materials
in the dry pumping system include oils, greases and seals. The dry pumping system
may have overheated if it was misused, if it malfunctioned or if it was in a fire. Our
safety datasheets for the fluorinated materials used in the pump are available on
request.
The dry pumping system requires little operator maintenance between overhauls. Pump
protection sensors fitted to the dry pumping system do not require routine
maintenance. The maintenance operations that can be carried out are described in the
following sections. The frequency of maintenance operations depends on the process.
Adjust the frequency of maintenance operations according to your experience.
When maintaining the dry pumping system, use replacement parts, seals and fittings
supplied by us. Refer to
that the purge gas and cooling water supplies are connected in parallel and that they
meet the specifications given in
information.

7.2 Preventive maintenance schedule

Table 20 Preventive maintenance schedule
Action
Check the oil level and top-up if required
Check water hoses
A41870880_A
A41870880_A - Maintenance
Technical data
Service on page 73, Spares and accessories
Technical data
Page 56
on page 15).
on page 74. Ensure
on page 15. Contact us for more
Frequency
1 week
6 months or 4000 operating hours
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