Comment tylanbpsg SNF 2006-07-20 03:13:17: Soft pump doesn't appear operable

dwburns at snf.stanford.edu dwburns at snf.stanford.edu
Thu Jul 20 03:13:18 PDT 2006


Step 40 of recipe LTO400 has a soft pump for the first minute+ as indicated by the panel controller light, followed by the opening of the gate valve with its controller light coming on.  During the soft pump portion, the tube pressure continues upward until the gate valve opens, at which time the tube pressure drops dramatically.  It doesn't appear that the soft pump is operable, and that this may be the case for quite awhile.




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