© Edwards Limited 2008. All rights reserved. Page 15
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Maintenance
A386-11-880 Issue E
4Maintenance
4.1 Introduction
4.1.1 Safety information
Ensure that the maintenance technician is familiar with the safety procedures which relate to the products
processed by the pumping system. Wear the appropriate safety-clothing when you come into contact with
contaminated components. Dismantle and clean contaminated components inside a fume-cupboard.
Vent and purge the pumping system before you start maintenance work.
Check that all the required components are available and of the correct type before you start work.
Disconnect the other components in the pumping system from the electrical supply so that they cannot be
operated accidentally.
Do not reuse ‘O’ rings and Co-Seals if they are damaged.
Leak-test the system after maintenance if you have connected or disconnected any vacuum joints. Seal any
leaks found to prevent leakage of dangerous substances out of the system and leakage of air into the system.
4.1.2 Overheated fluorinated materials
Fluorinated materials are used in the Exhaust-Silencer and the CDP, QDP and iQDP pumps. Fluorinated materials are
safe in normal use but can decompose into very dangerous substances (which may include hydrofluoric acid) if they
are heated to 260 ºC and above.
The Exhaust-Silencer or the pump may have overheated if they were misused, malfunctioned or were in a fire. If the
Exhaust-Silencer or pump has overheated, take extreme care to avoid skin contact with any part of the Exhaust-
Silencer and pump and to avoid inhalation of vapours from the Exhaust-Silencer and pump. Edwards Health and Safety
Data sheets for the fluorinated materials used in the pump and the Exhaust-Silencer are available on request: contact
your supplier or Edwards.
4.2 Frequency of maintenance
We recommend that you inspect and clean the Exhaust-Silencer at least every three months. However in practice,
the frequency of maintenance is dependent on your process. In clean processes, you may be able to decrease the
frequency of maintenance; in harsh processes you may have to increase the frequency of maintenance. Adjust the
frequency of maintenance according to your experience.
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.
Do not touch or inhale the thermal breakdown products of fluorinated materials which may be
present if the Exhaust-Silencer or the pump has been heated to 260 ºC and above. These
breakdown products are very dangerous. Fluorinated materials in the Exhaust-Silencer and pump
may include oils, greases and seals.
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