Edwards EH500

© Edwards Limited 2014. All rights reserved. Page 25
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Maintenance
A301-05-880 Issue A
5Maintenance
5.1 Safety information
 A suitably trained and supervised technician must maintain the pump.
 Dismantle the pump in a clean workshop environment, with the correct tools and safety facilities available.
 Ensure that the maintenance technician is familiar with the safety procedures that relate to the products
processed by the pumping system.
 Wear the appropriate safety clothing when coming into contact with contaminated components.
 Dismantle and clean contaminated components inside a fume cupboard.
 Allow the pump to cool for at least three hours before starting maintenance work.
 Vent and purge the pumping system with nitrogen before starting maintenance work.
 Check that all the required parts are available and of the correct type before starting work.
 Isolate the pump and other components from the electrical supply so that they cannot be operated
accidentally.
 Re-check the pump rotation direction if the electrical supply has been disconnected.
 Do not reuse O-rings or seals.
 Dispose of components and waste oil safely (see Section 6.2).
 Take care to 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 been overheated to 260 ºC and above. These breakdown products are very dangerous. Fluorinated
materials in the EH 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 Safety Data Sheets for fluorinated materials used
in the pump are available on request: contact the supplier or Edwards.
 Leak test the system after installation and maintenance to prevent leakage of dangerous substances out of
the system and leakage of air into the system.
The EH pump will be contaminated with the process chemicals that have been pumped. Ensure that adequate
precautions are taken to protect people from the effects of dangerous substances if contamination has occurred.
WARNING
Obey the safety instructions in this Section and take note of appropriate precautions. Failure to
observe these instructions may result in injury to people and damage to equipment.
Table 14 - Maintenance plan
Operation Frequency Refer to Section
Check the oil levels Weekly 5.3
Inspect the pump connections Monthly 5.4
Change the pump oil 12 monthly 5.5
Lubricate the rear bearing 12 monthly 5.6
Overhaul the pump 6 yearly 5.7