Reports until 20:00, Friday 02 June 2017
LHO VE
kyle.ryan@LIGO.ORG - posted 20:00, Friday 02 June 2017 (36633)
CP4
1925 hrs. local 

I found the rotometer ball off of the stop about 1/2 the diameter of the ball (< 0.4 LPM the smallest graduation of the flow scale).  When the isolation valve at the plumbing manifold was closed, this small flow stopped, i.e. the ball rested.  This was repeatable.  This could be flow across the sensing line blockage or it could also be leakage flow out of the 4 or 5 pipe joints which can't be isolated.  Anyway, this wasn't occurring the last time I inspected it.  The UHP N2 bottle is at 1800 psi tonight, down 300 psi from 24 hrs. ago.  

While there, I repeated the exercise of switching between pumping the sensing line with a small vacuum pump then switching to pressurizing with the UHP N2.  I had made a few attempts at this yesterday? the day before? but could never establish any flow.  Tonight, I was able to achieve flow for 10s of seconds at a time. I would have like to have continued this as it is so encouraging but I don't want my children to grow up without knowing their daddy + plus I'm hungry plus .....

I am leaving the apparatus at 60 psi regulator output and adjusted for 2 LPM max.