Problem mrc SNF 2012-10-23 17:44:25: Gate valve seal fails during roughing

[jimkruger at snf.stanford.edu]

At first, only sometimes but after 2 or 3 runs, every run. Pressure bursts high in forline about 20 or 30 seconds into roughing.
Workaround is stop rough, 10 sec delay in center position, then pump foreline for a minute or 2 before going back to roughing.
If you dont understand this, please don't use MRC without help  (e.g. Jim Kruger or Nancy).