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| pld:start [2011/05/25 14:20] – chris | pld:start [2011/05/25 14:35] – chris |
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| Bearing failure of this particular pump is known to happened at late as 20,000 hours, and as early as 6,000 hours. This is why the bearing maintenance should be performed at 5000 hours. The turbo pump controller is configured to to remind the user when this interval is met or exceeded. | Bearing failure of this particular pump is known to happened at late as 20,000 hours, and as early as 6,000 hours. This is why the bearing maintenance should be performed at 5000 hours. The turbo pump controller is configured to to remind the user when this interval is met or exceeded. |
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| | ==== Main Chamber ==== |
| | The main chamber roughing and turbo pumps are manufactured by BOC Edwards. Like the Alcatel roughing pump, the oil should be changed every 6 months. However, it is essential that the oil **is not hydrocarbon oil**. The replacement oil **must be Krytox 1506** or Fomblin 06/6. The use of Krytox 1506 is preferred since the Fomblin type oils tend to leak and seep through seals in the pump, while the Krytox will not. |
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| | Do not mix these PFPE oils with hydrocarbon oils; if this happens the pump must be cleaned according to the manual's instructions as these oils are not compatible. This means that they are not soluble in one another, and the material properties will change across the interface, foaming may occur, and the pump will not be properly lubricated. Krytox is used because it is highly resistant to attack by oxygen or corrosive process gasses. **DO NOT EVER USE OXYGEN PROCESS GAS WITH HYDROCARBON OILS!** |
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