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Maintenance
M588-00-880 Issue E
5Maintenance
5.1 Safety and maintenance frequency
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 eye bolts 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. Note that the emergency stop switch on the dry pumping system
is not an electrical isolator.
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 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 Section 2).
Only personnel specially trained to perform electrical maintenance should attempt
troubleshooting inside electrical enclosures. These enclosures contain hazardous voltages and are
not operator areas.
Leak test the dry pumping system after maintenance and seal any leaks found to prevent leakage
of dangerous substances out of and leakage of air into the dry pumping system.
Obey the safety instructions given below and take the appropriate precautions. Failure to do so
can cause injury to people and damage to equipment.
Electrical, purge gas and water supplies are all potentially hazardous energy sources. Before
carrying out any maintenance the supply of these sources should be locked and tagged out.
Personal protective equipment should be checked and used as specified by its supplier. Hazardous
chemicals that have been pumped are located within the pumps and piping. Use of suitable
protective gloves and clothing along with a respirator is recommended if contact with substances
is anticipated. Particular caution should be exercised when working with fluorinated materials
which may have been exposed to temperatures greater than 260 °C. Refer to Edwards Safety Data
Sheets for detailed information.
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