Spun up vertex turbo right before lunch at ~0.6 Torr. Still need to close purge/vent isolation valves (OMC and IMC) and IP3 GV and little right angle valve.
The DMT production computers in the MSR, h1dmt0, h1dmt1, and h1dmt2, have been patched and rebooted. WP 7466 is done.
At ~2256utc on 3 April (or precisely 1206831398gps), all the CPS sensor readouts on both stages jumped to a different value. Eight of the twelve spiked to a 33kish number before going somewhere else. A few on Stage2 are not crazy numbers but still shifted. Most on Stage1 are extreme ~positive 8k. See attached
Another item to be investigated is the Coil Driver Thermal trip hit at 1557utc on the fifth...
Wasted a bit of time by power cycling the CPS power and the sensors interface chassis. Found the CPS Timing Sync fanout chassis power supply unplugged. Guess it got swept up in the VE group's house cleaning that was found to be necessary. While the senors don't read exactly what they did before, they are at least much more reasonable. And, the platform will isolate.
I confirmed with Patrick yesterday that the RS232 flow rate for both chillers shows that the chillers are on, and the flow rates are around 3gpm.
The flow rates on the medm are negative, both around -2.5gmp.
Greg's most recent alog 41314 from April 5th says the chiller is running in a small closed loop, and it appears that this is for both TCSX and TCSY chillers.
Patrick went to look, and all 3 TCS chillers are running and all read around 3gpm flow.
Kyle, Gerardo, Chandra Today we pumped IP11 using a local turbo backed by an aux. cart. IP11 is isolated from the Y-end via its closed GV. As I squirted IPA around each CFF joint and vacuum welds of the Chevron Baffle nipple, Gerardo M. monitored the pressure gauge on the aux. cart to see if there was a response. Chandra R. had already established this to be a very large leak (0.1 torr*L/sec). We tried "listening" for the audio leak using a device intended for that purpose -> Something seems to be originating from the Chevron Baffle but difficult to eliminate background noise in the room -> We shut down the Clean Room (1417 hrs. local) and that helped a little. Next, we modified the as-found bag such that each CFF joint was exposed but keeping the nipple's tube vacuum welds within the bagged volume. We then purged the bag with bottled N2 while spraying helium around each CFF joint -> no significant response. Finally, we reversed the bagging, now purging the CFF joint(s) while spraying helium around the welds of the nipple tube -> found very large leak coming from the bottom tube-to-flange vacuum weld (nipple s/n 01). Having found one leaking Chevron Baffle, Chandra R. examined a different one stored in the VPW. She found suspicious looking welds. Also, we prepared IP11+chevron baffle nipple for tomorrow's removal by venting it with bottled UHP N2 and removing all but (3) ea. of the nipple-to-GV nuts and studs. Note that with the local turbo spun down and disconnected from the aux. cart, I applied the N2 to the Tee at the inlet of the turbo letting it flow trough the turbo and into the room via the open-ended turbo exhaust line. This setup would prevent the possibility of over-pressurizing IP11 as it remained open to the room. I then opened the 1 1/2" vent/pump valve to vent IP11. Gerardo M. noticed that room air was then entering through the exhaust. Thus, for a short period, I had been back streaming through the local turbo and into IP11. I then closed the 1 1/2" valve and removed the turbo. This is a "dirty" pump in that it is not a maglev. I'll consult Chandra R. as to what, if any action is needed (FTIR?).
Isolated QDP80 at vertex with pressure at 1.3 Torr. Will resume tomorrow morning.
Chandra has requested that the high alarm level for H0:VAC-MY_CP3_TE202A_DISCHARGE_TEMP_DEGC be raised from 130.0 degC to 140.0 degC (this signal is currently operating at 131.1 degC). This was done and the alarm system was restarted.
day started with JeffB's alog: 41345
All Tmes UTC:
LIGO-E1800008: ECR: Timing Comparator replace 5V regulator with seperate DC Power board
LIGO-E1200034: Timing RF Counter/Comparator Software Release
LIGO-E1700246: ECR: Add frequency counter channels to timing comparator
One down, three to go!
Reinstalled proper Timing Comparator S1107952 into CER and returned spare to the rack. *Spare still requires upgrade
Pulled, Upgraded and Reinstalled MSR Timing Comparator S1201224.
No front ends were harmed in this operation.
Three Timing Comparators done, one remains unmodified at X end.
Today, Travis and I finished assembling the ETMX lower reaction chain. We assembled the PenRe mass in the structure, attaching the balance of parts to make the weight from last week including AOSEMs, cables, and cable routing brackets. We then installed the new annular AERM07 mass below the PenRe in the lower structure and adjusted it in it's 6 DOF's by eye before suspending it. We then reclamped everything and rolled the main lower chain up to it. A quick lift via the Genie duct jack and we set the main lower structure and newly fiber'ed masses into the trolley with the reaction set. We added the UIM and PUM magnets/flags (set with polarities per the QUAD controls poster), and then shoved the 2 structures together and fastened them.
We wrapped the now complete lower unit and rolled it to the chamber side. After attaching some of the LSAT lifting blocks, we staged the Genie duct jack so that we are ready to install it on the arm and into the chamber tomorrow.
Note - Travis noticed a door bolt sitting in the BSC9 flange in the unused hole at 3 o'clock. The washer from the bolt (which held nothinglooked to be rubbing funny on the o-ring so he removed it. The vacuum crew will need to inspect this after we remove the install arm. (Note, the install arm and stiffening flanges cover most of the right side of holes and o-ring on this chamber, except for a ~6" gap at 3 o'clock. There are o-ring covers everywhere else. This bolt should not have been in this hole, since it served no purpose.)
From Chandra and Kyle who inspected this o-ring portion yesterday late afternoon:
Kyle and I inspected the o-ring and deemed it ok to reuse. Kyle peeled away a sliver of viton material that was hanging off of the o-ring. To the naked eye the surface looks ok. We will take note of this when we install the door and pump down the annulus volume.
Vent: Plan to put HAM6 doors on mid next week PSL: Tweaks and alignment continue. Will be adding the shutter shortly. Commissioning wants the beam on Wednesday VAC: NO ACCESS TO HAM6 until Wednesday Leak checking at various points across the site Leak at End-Y CS vertex is pumping down Viewport work at HAM6 MY CP4 bake out continues CDS/EE: Working on End-Y timing system Working on End-Y AOS laser interlock PEM: Moving a weather station to a Beckhoff system
70W install is ongoing.
I have moved a subset of guardian nodes to the new configuration on h1guardian1. This is to try to catch more of the segfaults we were seeing during the last upgrade attempt, that we have not been able to reproduce in testing.
The nodes should function normally on the new system, but given what we saw before we expect to see segfaults with a mean time to failure of about 100 hours. I will be baby sitting the nodes on the new setup, and will restart them as soon as they crash.
The nodes that have been moved to the new system are all the SUS and SEI nodes in the input chambers, BS, and the arms. No nodes from HAM4, HAM5, or HAM6 were moved. Full list of nodes now running on h1guardian1:
jameson.rollins@opsws12:~ 0$ ssh guardian@h1guardian1 list HPI_BS HPI_ETMX HPI_ETMY HPI_HAM1 HPI_HAM2 HPI_HAM3 HPI_ITMX HPI_ITMY ISI_BS_ST1 ISI_BS_ST1_BLND ISI_BS_ST1_SC ISI_BS_ST2 ISI_BS_ST2_BLND ISI_BS_ST2_SC ISI_ETMX_ST1 ISI_ETMX_ST1_BLND ISI_ETMX_ST1_SC ISI_ETMX_ST2 ISI_ETMX_ST2_BLND ISI_ETMX_ST2_SC ISI_ETMY_ST1 ISI_ETMY_ST1_BLND ISI_ETMY_ST1_SC ISI_ETMY_ST2 ISI_ETMY_ST2_BLND ISI_ETMY_ST2_SC ISI_HAM2 ISI_HAM2_SC ISI_HAM3 ISI_HAM3_SC ISI_ITMX_ST1 ISI_ITMX_ST1_BLND ISI_ITMX_ST1_SC ISI_ITMX_ST2 ISI_ITMX_ST2_BLND ISI_ITMX_ST2_SC ISI_ITMY_ST1 ISI_ITMY_ST1_BLND ISI_ITMY_ST1_SC ISI_ITMY_ST2 ISI_ITMY_ST2_BLND ISI_ITMY_ST2_SC SEI_BS SEI_ETMX SEI_ETMY SEI_HAM2 SEI_HAM3 SEI_ITMX SEI_ITMY SUS_BS SUS_ETMX SUS_ETMY SUS_IM1 SUS_IM2 SUS_IM3 SUS_IM4 SUS_ITMX SUS_ITMY SUS_MC1 SUS_MC2 SUS_MC3 SUS_PR2 SUS_PR3 SUS_PRM SUS_RM1 SUS_RM2 SUS_TMSX SUS_TMSY jameson.rollins@opsws12:~ 0$
NOTE: Until the new system has been put fully into production, "guardctrl" interaction with these nodes on h1guardian1 is a bit different. To start/stop the nodes, or get status or view the logs, you will need to send the appropriate guardctrl command to guardian@h1guardian1 over ssh, e.g.:
jameson.rollins@opsws12:~ 0$ ssh guardian@h1guardian1 status SUS_BS ● guardian@SUS_BS.service - Advanced LIGO Guardian service: SUS_BS Loaded: loaded (/usr/lib/systemd/user/guardian@.service; enabled; vendor preset: enabled) Drop-In: /home/guardian/.config/systemd/user/guardian@.service.d └─timeout.conf Active: active (running) since Sun 2018-04-08 14:48:47 PDT; 1h 53min ago Main PID: 24724 (guardian SUS_BS) CGroup: /user.slice/user-1010.slice/user@1010.service/guardian.slice/guardian@SUS_BS.service ├─24724 guardian SUS_BS /opt/rtcds/userapps/release/sus/common/guardian/SUS_BS.py └─24745 guardian-worker SUS_BS /opt/rtcds/userapps/release/sus/common/guardian/SUS_BS.py Apr 08 14:48:50 h1guardian1 guardian[24724]: SUS_BS executing state: ALIGNED (100) Apr 08 14:48:50 h1guardian1 guardian[24724]: SUS_BS [ALIGNED.enter] Apr 08 16:01:45 h1guardian1 guardian[24724]: SUS_BS REQUEST: ALIGNED Apr 08 16:01:45 h1guardian1 guardian[24724]: SUS_BS calculating path: ALIGNED->ALIGNED Apr 08 16:01:45 h1guardian1 guardian[24724]: SUS_BS same state request redirect Apr 08 16:01:45 h1guardian1 guardian[24724]: SUS_BS REDIRECT requested, timeout in 1.000 seconds Apr 08 16:01:45 h1guardian1 guardian[24724]: SUS_BS REDIRECT caught Apr 08 16:01:45 h1guardian1 guardian[24724]: SUS_BS [ALIGNED.redirect] Apr 08 16:01:45 h1guardian1 guardian[24724]: SUS_BS executing state: ALIGNED (100) Apr 08 16:01:45 h1guardian1 guardian[24724]: SUS_BS [ALIGNED.enter] jameson.rollins@opsws12:~ 0$
A couple of the SEI systems did not come back up to the same states they were in before the move. This caused a trip on ETMY HPI, and ETMX ISI_ST1. I eventually recovered everything back to the states they were in at the beginning of the day.
The main problem I've been having is with the ISI_*_SC nodes. They all are supposed to be in the SC_OFF state, but a couple of the nodes are cycling between TURNING_OFF_SC and SC_OFF. For instance, ISI_ITMY_ST2_SC is showing the following:
2018-04-09_00:00:39.728236Z ISI_ITMY_ST2_SC new target: SC_OFF
2018-04-09_00:00:39.729272Z ISI_ITMY_ST2_SC executing state: TURNING_OFF_SC (-14)
2018-04-09_00:00:39.729667Z ISI_ITMY_ST2_SC [TURNING_OFF_SC.enter]
2018-04-09_00:00:39.730468Z ISI_ITMY_ST2_SC [TURNING_OFF_SC.main] timer['ramping gains'] = 5
2018-04-09_00:00:39.790070Z ISI_ITMY_ST2_SC [TURNING_OFF_SC.run] USERMSG 0: Waiting for gains to ramp
2018-04-09_00:00:44.730863Z ISI_ITMY_ST2_SC [TURNING_OFF_SC.run] timer['ramping gains'] done
2018-04-09_00:00:44.863962Z ISI_ITMY_ST2_SC EDGE: TURNING_OFF_SC->SC_OFF
2018-04-09_00:00:44.864457Z ISI_ITMY_ST2_SC calculating path: SC_OFF->SC_OFF
2018-04-09_00:00:44.865347Z ISI_ITMY_ST2_SC executing state: SC_OFF (10)
2018-04-09_00:00:44.865730Z ISI_ITMY_ST2_SC [SC_OFF.enter]
2018-04-09_00:00:44.866689Z ISI_ITMY_ST2_SC [SC_OFF.main] SENSCOR_Y_IIRHP FMs:[4] is not in the correct configuration
2018-04-09_00:00:44.866988Z ISI_ITMY_ST2_SC [SC_OFF.main] USERMSG 0: SENSCOR_Y_IIRHP FMs:[4] is not in the correct configuration
2018-04-09_00:00:44.927099Z ISI_ITMY_ST2_SC JUMP target: TURNING_OFF_SC
2018-04-09_00:00:44.927619Z ISI_ITMY_ST2_SC [SC_OFF.exit]
2018-04-09_00:00:44.989053Z ISI_ITMY_ST2_SC JUMP: SC_OFF->TURNING_OFF_SC
2018-04-09_00:00:44.989577Z ISI_ITMY_ST2_SC calculating path: TURNING_OFF_SC->SC_OFF
2018-04-09_00:00:44.989968Z ISI_ITMY_ST2_SC new target: SC_OFF
2018-04-09_00:00:44.991117Z ISI_ITMY_ST2_SC executing state: TURNING_OFF_SC (-14)
2018-04-09_00:00:44.991513Z ISI_ITMY_ST2_SC [TURNING_OFF_SC.enter]
2018-04-09_00:00:44.993546Z ISI_ITMY_ST2_SC [TURNING_OFF_SC.main] timer['ramping gains'] = 5
2018-04-09_00:00:45.053773Z ISI_ITMY_ST2_SC [TURNING_OFF_SC.run] USERMSG 0: Waiting for gains to ramp
Note that the problem seems to be that it's failing a check for the SENSCOR filter banks being in the correct state once SC_OFF has been achieved. Here are the nodes that are having problems, and the messages they're throwing:
ISI_HAM2_SC [SC_OFF.main] SENSCOR_GND_STS_Y_FIR FMs:[1] is not in the correct configuration ISI_HAM3_SC [SC_OFF.main] SENSCOR_GND_STS_Y_FIR FMs:[1] is not in the correct configuration ISI_BS_ST2_SC [SC_OFF.main] SENSCOR_Y_IIRHP FMs:[4] is not in the correct configuration ISI_BS_ST1_SC [SC_OFF.main] SENSCOR_GND_STS_Y_WNR FMs:[6] is not in the correct configuration ISI_ITMX_ST2_SC [SC_OFF.main] SENSCOR_Y_IIRHP FMs:[4] is not in the correct configuration ISI_ITMY_ST2_SC [SC_OFF.main] SENSCOR_Y_IIRHP FMs:[4] is not in the correct configuration ISI_ETMY_ST1_SC [SC_OFF.main] SENSCOR_GND_STS_Y_WNR FMs:[6] is not in the correct configuration ISI_ETMY_ST1_SC [SC_OFF.main] SENSCOR_GND_STS_Y_WNR FMs:[6] is not in the correct configuration
I've tried to track down where exactly the problem is coming from, but haven't been able to figure it out yet. It looks like the expected configuration just does not match with how they're currently set. I will need to consult with the SEI folks tomorrow to sort this out. In the mean time, I'm leaving all of the above nodes paused.
A note on the SC nodes:
Since these new SC nodes are still in a bit of a testing phase, I don't think all of the filters that will be used are in the configuration file. One way we could get around this, until the config file is set exactly how the SEI wants it, is to remove the check temporarily. I'm hesitant to remove it entirely, but that might be best since it doesn't allow for any testing of new filters.
As of 7:50 am this morning (after I restarted 5 nodes last night):
HPI_BS enabled active 2018-04-08 14:48:46-07:00 HPI_ETMX enabled active 2018-04-08 14:48:05-07:00 HPI_ETMY enabled active 2018-04-08 15:55:18-07:00 HPI_HAM1 enabled active 2018-04-08 14:42:32-07:00 HPI_HAM2 enabled failed 2018-04-08 14:40:54-07:00 HPI_HAM3 enabled active 2018-04-08 14:41:09-07:00 HPI_ITMX enabled active 2018-04-08 14:48:05-07:00 HPI_ITMY enabled failed 2018-04-08 14:48:05-07:00 ISI_BS_ST1 enabled active 2018-04-08 14:49:54-07:00 ISI_BS_ST1_BLND enabled active 2018-04-08 15:38:51-07:00 ISI_BS_ST1_SC enabled active 2018-04-08 16:16:57-07:00 ISI_BS_ST2 enabled failed 2018-04-08 14:49:54-07:00 ISI_BS_ST2_BLND enabled active 2018-04-08 15:38:51-07:00 ISI_BS_ST2_SC enabled active 2018-04-08 16:16:56-07:00 ISI_ETMX_ST1 enabled failed 2018-04-08 14:47:10-07:00 ISI_ETMX_ST1_BLND enabled active 2018-04-08 15:34:22-07:00 ISI_ETMX_ST1_SC enabled active 2018-04-08 16:16:57-07:00 ISI_ETMX_ST2 enabled active 2018-04-08 14:47:10-07:00 ISI_ETMX_ST2_BLND enabled active 2018-04-08 15:34:21-07:00 ISI_ETMX_ST2_SC enabled active 2018-04-08 16:16:56-07:00 ISI_ETMY_ST1 enabled active 2018-04-08 14:47:10-07:00 ISI_ETMY_ST1_BLND enabled active 2018-04-08 15:37:45-07:00 ISI_ETMY_ST1_SC enabled active 2018-04-08 16:16:57-07:00 ISI_ETMY_ST2 enabled active 2018-04-08 14:47:10-07:00 ISI_ETMY_ST2_BLND enabled failed 2018-04-08 15:37:45-07:00 ISI_ETMY_ST2_SC enabled active 2018-04-08 16:16:57-07:00 ISI_HAM2 enabled active 2018-04-08 14:40:54-07:00 ISI_HAM2_SC enabled failed 2018-04-08 16:16:57-07:00 ISI_HAM3 enabled failed 2018-04-08 14:41:09-07:00 ISI_HAM3_SC enabled active 2018-04-08 16:16:56-07:00 ISI_ITMX_ST1 enabled active 2018-04-08 14:47:10-07:00 ISI_ITMX_ST1_BLND enabled active 2018-04-08 23:17:14-07:00 ISI_ITMX_ST1_SC enabled active 2018-04-08 16:16:57-07:00 ISI_ITMX_ST2 enabled active 2018-04-08 23:17:14-07:00 ISI_ITMX_ST2_BLND enabled failed 2018-04-08 15:33:53-07:00 ISI_ITMX_ST2_SC enabled active 2018-04-08 16:16:57-07:00 ISI_ITMY_ST1 enabled active 2018-04-08 14:47:10-07:00 ISI_ITMY_ST1_BLND enabled active 2018-04-08 15:33:12-07:00 ISI_ITMY_ST1_SC enabled failed 2018-04-08 16:16:57-07:00 ISI_ITMY_ST2 enabled active 2018-04-08 14:47:10-07:00 ISI_ITMY_ST2_BLND enabled failed 2018-04-08 15:33:37-07:00 ISI_ITMY_ST2_SC enabled active 2018-04-08 16:16:57-07:00 SEI_BS enabled active 2018-04-08 14:48:45-07:00 SEI_ETMX enabled active 2018-04-08 14:47:26-07:00 SEI_ETMY enabled active 2018-04-08 23:17:13-07:00 SEI_HAM2 enabled active 2018-04-08 14:40:53-07:00 SEI_HAM3 enabled active 2018-04-08 14:41:08-07:00 SEI_ITMX enabled failed 2018-04-08 14:47:26-07:00 SEI_ITMY enabled active 2018-04-08 14:47:26-07:00 SUS_BS enabled active 2018-04-08 23:17:13-07:00 SUS_ETMX enabled active 2018-04-08 14:47:27-07:00 SUS_ETMY enabled active 2018-04-08 14:47:27-07:00 SUS_IM1 enabled active 2018-04-08 14:05:38-07:00 SUS_IM2 enabled failed 2018-04-08 14:05:38-07:00 SUS_IM3 enabled failed 2018-04-08 14:05:38-07:00 SUS_IM4 enabled failed 2018-04-08 14:05:38-07:00 SUS_ITMX enabled active 2018-04-08 14:47:27-07:00 SUS_ITMY enabled active 2018-04-08 23:17:13-07:00 SUS_MC1 enabled active 2018-04-08 23:17:14-07:00 SUS_MC2 enabled active 2018-04-08 14:40:11-07:00 SUS_MC3 enabled failed 2018-04-08 14:40:11-07:00 SUS_PR2 enabled failed 2018-04-08 14:40:11-07:00 SUS_PR3 enabled failed 2018-04-08 14:40:11-07:00 SUS_PRM enabled active 2018-04-08 14:40:11-07:00 SUS_RM1 enabled failed 2018-04-08 13:45:41-07:00 SUS_RM2 enabled active 2018-04-08 13:45:48-07:00 SUS_TMSX enabled active 2018-04-08 14:53:45-07:00 SUS_TMSY enabled active 2018-04-08 14:53:46-07:00
Including the five nodes I restarted last night, that's 23 seg faults out of 68 nodes in roughly 18 hours = 6 hour MTTF. That's higher than it was previously. I'm reverting all nodes back to h1guardian0.
All nodes have been reverted back to h1guardian0
I have attached a pdf with a breakdown of stack traces and pids, so that we can see what the causes of the failures were.
The "sei_config" guardian nodes (ISI_*_{BLND,SC}) were showing import errors having to do with not finding the module "SEI_CONFIG". It looks like this module was renamed to "sei_config" on March 26, but the nodes that import it were not updated to import the module under the new name. I've updated them appropriately, and committed to the SVN:
jameson.rollins@opsws12:/opt/rtcds/userapps/release/isi/h1/guardian 0$ svn status M ISI_BS_ST1_BLND.py M ISI_BS_ST1_SC.py M ISI_BS_ST2_BLND.py M ISI_BS_ST2_SC.py M ISI_ETMX_ST1_BLND.py M ISI_ETMX_ST1_SC.py M ISI_ETMX_ST2_BLND.py M ISI_ETMX_ST2_SC.py M ISI_ETMY_ST1_BLND.py M ISI_ETMY_ST1_SC.py M ISI_ETMY_ST2_BLND.py M ISI_ETMY_ST2_SC.py M ISI_HAM2_SC.py M ISI_HAM3_SC.py M ISI_HAM4_SC.py M ISI_HAM5_SC.py M ISI_HAM6_SC.py M ISI_ITMX_ST1_BLND.py M ISI_ITMX_ST1_SC.py M ISI_ITMX_ST2_BLND.py M ISI_ITMX_ST2_SC.py M ISI_ITMY_ST1_BLND.py M ISI_ITMY_ST1_SC.py M ISI_ITMY_ST2_BLND.py M ISI_ITMY_ST2_SC.py jameson.rollins@opsws12:/opt/rtcds/userapps/release/isi/h1/guardian 0$ svn commit Sending ISI_BS_ST1_BLND.py Sending ISI_BS_ST1_SC.py Sending ISI_BS_ST2_BLND.py Sending ISI_BS_ST2_SC.py Sending ISI_ETMX_ST1_BLND.py Sending ISI_ETMX_ST1_SC.py Sending ISI_ETMX_ST2_BLND.py Sending ISI_ETMX_ST2_SC.py Sending ISI_ETMY_ST1_BLND.py Sending ISI_ETMY_ST1_SC.py Sending ISI_ETMY_ST2_BLND.py Sending ISI_ETMY_ST2_SC.py Sending ISI_HAM2_SC.py Sending ISI_HAM3_SC.py Sending ISI_HAM4_SC.py Sending ISI_HAM5_SC.py Sending ISI_HAM6_SC.py Sending ISI_ITMX_ST1_BLND.py Sending ISI_ITMX_ST1_SC.py Sending ISI_ITMX_ST2_BLND.py Sending ISI_ITMX_ST2_SC.py Sending ISI_ITMY_ST1_BLND.py Sending ISI_ITMY_ST1_SC.py Sending ISI_ITMY_ST2_BLND.py Sending ISI_ITMY_ST2_SC.py Transmitting file data ......................... Committed revision 17121. jameson.rollins@opsws12:/opt/rtcds/userapps/release/isi/h1/guardian 0$
A couple other notes about the ISI_*_BLND and ISI_*_SC nodes:
Kyle closed the IMC & OMC purge valves and I closed the right angle metal valve on top of IP3 GV. Leak checker is connected to vertex turbo cart, valved out, and warming up for leak checking tomorrow or whenever He bottle is freed up from EY.