Edwards nRVi, Instruction Manual

Page: 68 / 100

7. Maintenance
7.1 Maintenance safety
WARNING:
Risk of injury or death. Wear the correct PPE during inspection or maintenance.
If the pump is PFPE-prepared, refer to PFPE-prepared rotary vane pumps on page 90
before maintaining the pump.
▪ A suitably trained and supervised technician must maintain the pump. Obey local
and national safety requirements.
▪ Ensure that the maintenance technician is familiar with the safety procedures
which relate to the pump oil and the products processed by the pumping system.
▪ 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.
▪ Allow the pump to cool (so that it is at a safe temperature for skin contact) before
starting maintenance work. Make sure the pump is switched off in case the
thermal overload device restarts the pump.
▪ Do not reuse O-rings and seals if they are damaged.
▪ After maintenance is completed, recheck the direction of pump rotation if the
electrical supply has been disconnected.
▪ The pump and the pump oil will be contaminated with the process chemicals that
have been pumped during operation. Ensure that the pump is decontaminated
before maintenance and that adequate precautions are taken to protect people
from the effects of dangerous substances if contamination has occurred.
▪ Do not touch or inhale the thermal breakdown products of fluorinated materials
which may be present if the pump has been heated to 310 °C and above.
Fluorinated materials are safe in normal use but can decompose into very
dangerous substances (which may include hydrofluoric acid) if they are heated to
310 °C and above. The pump may have overheated if it was misused, if it
malfunctioned, or if it was in a fire. Safety Data Sheets for fluorinated materials
used in the pump are available on request contact us or the supplier.
7.2 Maintenance plan
When maintaining the pump, use our spares and maintenance kits; these contain all the
components necessary to complete maintenance operations successfully.
More frequent maintenance may be required if the pump is used to pump corrosive or
abrasive gases and vapours, such as solvents, organic substances and acids. In these
circumstances, replacing the pump seals every year is recommended (refer to Spares on
page 85 for details of available spares). If necessary, adjust the maintenance plan
according to prior experience.
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A65901880_D - Maintenance