© Edwards Limited 2008. All rights reserved. Page 31
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Maintenance
A590-00-880 Issue D
5Maintenance
5.1 Safety and maintenance frequency
z Ensure that the maintenance technician is familiar with the safety procedures which relate to the products
pumped.
z Allow the pumps to cool to a safe temperature before you fit lifting bolts or start maintenance work.
z Vent and purge the dry pumping system with nitrogen before you start any maintenance work.
z 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, unless a disconnect box accessory is installed.
z Wait for at least four minutes after you have switched off the electrical supply before you touch any
electrical component on the dry pumping system.
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 system after maintenance and seal any leaks found to prevent leakage of dangerous
substances out of the system and leakage of air into the system.
Obey the safety instructions given below and take the appropriate precautions. If you do not, you
can cause injury to people and damage to equipment.
Electrical, nitrogen 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.
The iH1800HTX has two separate power supplies, one for the pump system and the other for the
exhaust TMS.
Personal protection 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 hydrocarbons which may have been
exposed to temperatures greater than 260 °C. Refer to Edwards Material Safety Data Sheets for
detailed information.
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