Reports until 10:23, Monday 06 August 2012
H1 SEI
greg.grabeel@LIGO.ORG - posted 10:23, Monday 06 August 2012 (3734)
Unit6 storage container purge
On July 31st Unit #6 was placed into a storage container. Aug. 1st a purge was started at 10:30am. Ambient air was 8.2 tdºC at 24.7ºC. Boil-off LN2 was run at 20lpm until about Aug. 3rd 2:00pm.

I tried to dry out the bag the wand was in and get a baseline for the purge gas, but after approximately 15 minutes of purging just the ameristat bag and the dewpoint wand was reading -34.4tdºC and 25.5ºC. I must have been picking up a fair bit of moisture from the line and bag.

Interestingly Unit 6 in the storage container dropped in dew point much faster than HAM6 in a shipping container. Maybe there is a significant difference between the shipping and storage containers. Do the inflow and outflow locations for the purge make a difference? Less surface area in a storage container?
Images attached to this report