© Edwards Limited 2008. All rights reserved. Page 41
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
S900-01-880 Issue C
3. Add oil as necessary until the oil level is half-way up the sight-glass. Only use oil specified in this manual.
4. Inspect the plug 'O' ring for cuts or damage, and replace it as necessary. Refit the oil filler plug.
5.6 Changing the oil
Use the following procedure to drain and refill each reservoir with oil:
1. Shut down the vacuum system and vent it to atmospheric pressure.
2. Place a suitable container under the drain plug (see Figures 1 and 2), then remove the drain plug and allow the
oil to drain out of the pump.
3. Inspect the plug 'O' ring for cuts or damage, and replace it as necessary. Refit the drain plug, then dispose of the
oil: refer to Section 6.
4. Fill the oil reservoir with oil: refer to Section 5.5.
5.7 Coupling maintenance
1. Shut down the vacuum system and vent it to atmospheric pressure. Allow the booster pump to cool to a safe
temperature.
2. Remove the safety guards when the pump is in a safe state.
3. Inspect the coupling as described in 3.8. Replace any worn or damaged parts.
4. Refit the safety guards.
5.8 Belt drive maintenance
1. Shut down the vacuum system and vent it to atmospheric pressure. Allow the booster pump to cool to a safe
temperature.
Changing the oil in a booster pump from hydrocarbon to PFPE (Fomblin) could potentially cause a
safety hazard. Fomblin pumps are generally used in hazardous applications which may involve the
pumping of gases with high concentrations of oxygen. If hydrocarbon oil comes into contact with
gases with an oxygen concentration greater than 25%, an explosion can occur.
Therefore, if you want to convert a booster pump that has been used with hydrocarbon oil to use
PFPE (Fomblin) oil, you cannot simply flush the pump with new PFPE oil. You must return the pump
to a Edwards Service Centre for overhaul and cleaning by qualified Edwards service engineers. The
change in oil type requires a complete strip-down of the pump, and thorough cleaning of all parts,
so that all traces of hydrocarbon oil are removed.
Never attempt to add or drain oil while the booster pump is operating. Shut down and lock-out the
booster pump and vent it to atmospheric pressure before you fill the pump with oil, or drain oil
from the pump.
Allow sufficient time for the booster pump to cool before you change the oil. If you do not, you
can be injured by the hot oil.
To Next Page
Loading...
