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Maintenance
LRP200000201 Issue A
5Maintenance
5.1 Safety
A suitably trained and supervised technician must maintain the pumping system. Contact Edwards for further
assistance.
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.
Ensure that all maintenance work is performed in a properly lighted area and in compliance with local and
national safety requirements.
Isolate the pump and other components from the electrical supply so that they cannot be operated
accidentally.
Leak test the vacuum system after maintenance work is complete if any process inlet or outlet joints have
connected or disconnected. Seal any leaks found.
5.2 Maintenance plan
The plans in Table 9, 10, and 11 detail the maintenance operations required to maintain the pumping system in
normal operation. Instructions for each operation are provided in the following sections. In practice, the frequency
of maintenance is dependent on the process and utilities. Adjust the maintenance plan according to experience.
5.2.1 Weekly intervals
5.2.1.1 Two week intervals
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/or damage to equipment.
Table 9 - Maintenance plan: weekly intervals
Operation Refer to section
Inspect pipelines and connections 5.3
Inspect the liquid ring pump 5.4
Table 10 - Maintenance plan: two week intervals
Operation Refer to section
If a standby pump, rotate the standby liquid ring pump drive shaft
*
†
*
Regular rotation of the shaft prevents grease migration.
†
Regular rotation of the shaft prevents pitting of the bearings caused be external vibrations and grease
migration.
5.4
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