Reports until 02:13, Wednesday 07 June 2017
LHO VE
kyle.ryan@LIGO.ORG - posted 02:13, Wednesday 07 June 2017 - last comment - 09:35, Wednesday 07 June 2017(36688)
Unexpected pressure rise at Y-mid 
 

I checked the Vacuum Site Overview MEDM screen and saw the telltale rise in pressure at the Y-mid station that is consistent with a warming 80K cyrogenic pump,  I investigated and found that IP9 had tripped off so I restarted it.  Only one of the two channels restarted.  The other channel is inop.  While on site I overfilled CP4 by opening the LLCV manual bypass valve 1/2 turn.  LN2 was observed at the exhaust outlet in a total of 38 minutes.
Non-image files attached to this report
IP9_failure_response.pdf
Comments related to this report
kyle.ryan@LIGO.ORG - 02:31, Wednesday 07 June 2017 (36689)
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		kyle.ryan@LIGO.ORG - 03:46, Wednesday 07 June 2017 (36690)
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C
Leaving UHP GN2 regulator output set at 40 psig and flow limitied to 2 LPM. 

0355 hrs. local -> Kyle leaving site (this time for real).  Cheryl V. in CR




		
		


	
	


	
	


		chandra.romel@LIGO.ORG - 07:40, Wednesday 07 June 2017 (36696)VE
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Thank you, Kyle and Gerardo, for responding. Tagging VE.


		
		


	
	


	
	


		gerardo.moreno@LIGO.ORG - 09:35, Wednesday 07 June 2017 (36701)VE
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Remote logged in at around 7:00 utc, determined that IP9 had tripped, notified Kyle who was already manually filling CP4 (first time).



At the same time I noticed that I had not fully restored CP4 fill control screen and the power for LLCV was still disabled (which is very easy to miss), at this time I enabled the power and restored all values, this screen was not restored due to a wrong burtrestore file, see Patrick's earlier aLOG.