Problem mrc SNF 2012-07-31 17:05:23: Foreline pressure burst during roughing

jimkruger at jimkruger at
Tue Jul 31 17:05:24 PDT 2012

Everytime I pump down the chamber, a rapid pressure rise in trhe forline occurs.  This is not my failure to wait long enough with the pump-down switch, it happens at the "halfway pumped" pressure.  I speculate that it is the "unloading" of the gate valve opening a leak.  Perhaps a new O-ring on the gate valve?

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