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| pld:start [2014/08/06 11:21] – bethany | pld:start [2014/08/20 13:32] – janet |
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| === Roughing Pump === | === Roughing Pump === |
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| 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. Typically, Krytox is sold by mass rather than by volume like most other oils. To successfully change the oil, 3kg are needed. As of 5/25/2011 Krytox 1506 costs ~$200/kg. 8/2014: Krytox 1506 costs $2,500/gal = $312.50/kg @ 8kg/gal. We use about 3kg/year. Krytox 1506 can be obtained about 6x more cheaply by **recycling** our used Krytox - approx $400/gal - from Kurt Lesker (2 gal minimum) or Ideal Gas (1 gal minimum). | The main chamber roughing and turbo pumps are manufactured by BOC Edwards. Like the Alcatel roughing pump, the oil on the Edwards roughing pump 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. Krytox 1506 is preferred since the Fomblin-type oils tend to leak and seep through seals in the pump, while the Krytox will not. Typically, Krytox is sold by mass rather than by volume like most other oils. To successfully change the oil, 3kg are needed. We use about 3kg/year. |
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| | 8/2014: Ideal Gas sells Krytox 1506 (new) for $200/kg; Lesker sells Krytox 1506 (new) for $2,500/gal = $312.50/kg @ 8kg/gal. |
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| | Krytox 1506 can be obtained about 6x more cheaply by **recycling** our used Krytox - approx $400/gal = - from Kurt Lesker (but must recycle 2 gal minimum) or from Ideal Gas (1 gal minimum). |
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| | 5/25/2011: Krytox 1506 costs ~$200/kg. |
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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!** | 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!** |
