Problem teos2 SNF 2012-09-06 15:43:52: failed 'leak check' (step 45) twice

ahn1229 at snf.stanford.edu ahn1229 at snf.stanford.edu
Sun Dec 23 09:24:46 PST 2012


failed the 'leak check' twice, and finally passed it at the 3rd try.
1) step 30 (stabilize) / 18:00
got 'MFS Alarm' during the first couple of minutes of the step.
The alarm's gone after 4-7 mins, and start to flow O2 gas.
@ 1st try, alarm's gone at remaining time about 12:00
@ 2nd try, it's gone at about 14:05 (pressure 1686)
@ 3rd try, it's gone at about 14:23 (pressure 1627)
2) step 35 (initial pump down) / 2:00
pressure drop from xxxx --> xxxxx
@ 1st try, ???? ---> 120.4
@ 2nd try, 1677 --> 67.5
@ 3rd try, 1628 --> 38.5
3) step 40 (pump down) / 4:00
@ 1st,2nd,3rd try, it was remaining at the lowest level.
4) step 45 (leak check) / 1:00
@ 1st, 2nd try, it failed to pass the leak check (pressure >60)
@ 3rd, pressure went up to 58.5, barely pass the leak check.



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