Displaying reports 47481-47500 of 86279.Go to page Start 2371 2372 2373 2374 2375 2376 2377 2378 2379 End
Reports until 10:58, Wednesday 27 December 2017
LHO FMCS
chandra.romel@LIGO.ORG - posted 10:58, Wednesday 27 December 2017 (39922)
Site check report

[Bubba, Chandra]

Site check complete. Bubba found the MPR door ajar this morning which is my fault. While I checked that it was latched when I locked it yesterday, I didn't tug on it when I left last night. A good reminder that when exiting through that door at night pull on it to make sure it latches all the way.

Found CP7 Dewar head pressure a bit high:  25 psig

No leaks and no weird smells except for some expired meat balls in the OSB kitchen fridge.

I cleared off the X/Y 2-8 solar panels.

LHO VE
chandra.romel@LIGO.ORG - posted 20:05, Tuesday 26 December 2017 - last comment - 08:26, Wednesday 27 December 2017(39908)
Corner pressure monitoring

PT120A: 280 Torr

PT100A: 308 Torr

Comments related to this report
kyle.ryan@LIGO.ORG - 20:30, Tuesday 26 December 2017 (39909)
Link 

Changed my mind and returned to site 20 minutes after having left to valve-out (unattended) pumping from HAM1.  As such, PT100A pressure should remain unchanged tonight.
kyle.ryan@LIGO.ORG - 21:14, Tuesday 26 December 2017 (39910)
Link 


2110 hrs. (PT120=227 torr, PT170=140 torr)
chandra.romel@LIGO.ORG - 21:58, Tuesday 26 December 2017 (39911)
Link

PT120A: 198 Torr

kyle.ryan@LIGO.ORG - 23:10, Tuesday 26 December 2017 (39912)
Link 

2305 hrs. PT120 = 136 torr, PT170 = 70.4 torr
chandra.romel@LIGO.ORG - 00:03, Wednesday 27 December 2017 (39913)
Link

PT120A: 80.8 Torr

kyle.ryan@LIGO.ORG - 01:11, Wednesday 27 December 2017 (39914)
Link 

0110 hrs. PT120A = 44.9 torr, PT170 = 34.0 torr
chandra.romel@LIGO.ORG - 02:04, Wednesday 27 December 2017 (39915)
Link

PT120a: 29 Torr

kyle.ryan@LIGO.ORG - 03:10, Wednesday 27 December 2017 (39916)
Link 

0310 hrs. PT120A = 17.3 torr, PT170 = 15.8 torr
chandra.romel@LIGO.ORG - 03:58, Wednesday 27 December 2017 (39917)
Link

PT120a: 12 Torr

kyle.ryan@LIGO.ORG - 05:11, Wednesday 27 December 2017 (39918)
Link 

0510 hrs. PT120A = 7.1 torr, PT170 = 7.0 torr
chandra.romel@LIGO.ORG - 06:04, Wednesday 27 December 2017 (39919)
Link

PT120a: 4.95 Torr

kyle.ryan@LIGO.ORG - 07:04, Wednesday 27 December 2017 (39920)
Link 

0705 hrs.  PT120A = 3.3 torr, PT170 = 3.4 torr
chandra.romel@LIGO.ORG - 08:26, Wednesday 27 December 2017 (39921)
Link

Corner is pumping down nicely! PT-120A reading 1.98 Torr.

Images attached to this comment
LHO VE
chandra.romel@LIGO.ORG - posted 17:47, Tuesday 26 December 2017 (39907)
Roughing corner station

We valved in both QDP80 roughing pumps at 3:45 pm local today. Pressure is currently at 480 Torr on PT-120A. We will leave the pumps valved in tonight while we're in viscous flow. We verified both safety valves close upon pump failure. HAM 1 is also being roughed out via scroll pump and will stay valved in over night. PT-100A is currently at 416 Torr. Kyle and I have agreed to check pressures from home every hour and log results.

We are both leaving site now.

LHO FMCS
chandra.romel@LIGO.ORG - posted 17:33, Tuesday 26 December 2017 (39906)
Site report

Site checks out fine. X-mid station air temperature feels warm, but that is to be expected; Bubba reports turning off chillers and we also see a rise in beam tube pressure (and GV AIP currents) since Sunday evening. 

CP3 and CP6 Dewars were filled today. CP3 truck arrived late and is still here (5:30 pm local). 

LHO VE
chandra.romel@LIGO.ORG - posted 11:33, Tuesday 26 December 2017 - last comment - 17:07, Tuesday 26 December 2017(39904)
Rough down prep

[Kyle, Chandra]

Started both QDP80 roughing pumps this morning with a purge air load to let them warm up before valving into corner volume. Blocks measure ~ 70degC.

Kyle checked the pressure of main volume to verify we aren't over pressurizing system with purge air - measured 1/2 psi with calibrated mechanical gauge that we use for proof testing viewports. PT-120A pirani gauge on BSC2 reads 942 Torr, which converts to 3.5 psi over standard atmospheric pressure, but we know this gauge is biased high.

Comments related to this report
kyle.ryan@LIGO.ORG - 17:07, Tuesday 26 December 2017 (39905)
Link 

I recorded the "calibrated" pressure reading taken at the IMC vent/purge connection and compared it to the time-corresponding pressure indicated by PT120A (pirani gauge) all while in pressure equilibrium [0.6 psi versus PT120A indicated value of 941.5 torr].  Recall that we have documented a known problem with PT120A's indicated pressure values for high pressure conditions.  We had tried multiple sensor heads and minimized the ATM potentiometers but just can't get the CDS read back to agree with the known conditions.  For some unknown reason, it is always indicating a much higher pressure than the actual pressure.  We eventually "moved on" but resolved to work with EE/CDS at some point to figure it out (low priority at the time).  

I also measured the maximum pressure available from the purge-air supply using the "fancy" mechanical gauge and measured 1.2 psi maximum.  This agrees with the maximum value ever observed at the mechanical gauges at the output of the purge air supply skid and gives us confidence that we haven't over-pressurized the vacuum system (read "view ports").
Non-image files attached to this comment
H1 General
jeffrey.bartlett@LIGO.ORG - posted 08:35, Tuesday 26 December 2017 (39903)
PSL Chiller & Dust Monitor Checks 

   Added 200ml water to Crystal chiller and 100ml to diode chiller. Both chiller system filters are good. Will make another check at the end of the week.  

   Ran LVEA dust monitor check script. DM #2 is offline. All others are working. Given site stand down condition for holidays, I did not go into the LVEA to reset it. This can wait until Jan 2nd or if someone else remembers it before then.
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