Letter 30051 Need to patch up the leakage in vac chamber [Ontario]   ++++ There is a Crack observed in the vacuum chamber at the welded joint. The chamber vacuum is thus not able to drop below a particular point. I was wondering if I could patch this temporarily with any sort of material and also not affect the process of degassing in the process. Are there any sealant or paste used for this application? Satish Ail maintenance personnel - Etobicoke, ON, Canada ++++ How bad is the leak? If it isn't too bad, you can use an epoxy-based sealant, such as VacSeal. Best to apply it to the outside while surface is under vacuum -- the vacuum pulls the material into the leak. You should see some immediate results, and it will improve a bit over a day or so as the material dries. Jim Treglio - Gardena, California January 29, 2007 Just a Caution. The previous suggestion is a good one depending on the operating pressure range. Another product is Torr Seal which works well but I don't know if it is still manufactured. The caution is that most of these techniques will contaminate the crack area and make it extremely difficult to properly repair the crack by welding at a later date. Grantley Este - Ottawa, Canada

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