<!-- Title: 07:44:58  Mon Sep 25 2000 -->
<!-- Crewchief: Steve Gordon -->
<!-- Op1: Chuck McNeal -->
<!-- Op2: Cryo types -->
<!-- Op3: &nbsp; -->
<!-- Op4: &nbsp; -->
<!-- Op5: &nbsp; -->
<!-- Op6: &nbsp; -->
<!-- Notes: -->
New week. Prepare for cooldown.


<!-- Date: Mon Sep 25 07:49:53 2000 -->
<pre>Found the turbo pump tripped off this morning with no indicator light on. PV70 did close. Solenoid vacuum is 14u. Starting the pump, there were 2 trips: acceleration retarded and overcurrent.</pre>
<!-- Author: Steve -->


<!-- Date: Mon Sep 25 07:55:03 2000 -->
The plant side of the He system held pressure well since Saturday. 
<!-- Author: Steve -->
<!-- Comment: Mon Sep 25 08;18;06 comment by...sg -->
<a href=/cgi/elog/det-system-elog.pl?nb=cryo-gas&action=view&page=72&anchor=12:18:45 target=_top><img src='/elog/gifs/gr_menu.gif' width=19 height=10 border=0></a>


<!-- Comment: Mon Sep 25 08;32;58 comment by...sg -->
Use the green arrow to see Saturday's pressures.
<!-- Date: Mon Sep 25 08:31:34 2000 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cryo-gas&action=view&page=-41&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cryo-gas&action=view&page=-41  width='250' align='top'></td><td>Todays pressures.</a></td></tr></table>
<!-- Author: Steve -->



<!-- Date: Tue Sep 26 16:54:16 2000 -->
We have installed the helium u-tubes. Setting up for pumping and backfilling. 
<!-- Author: sg -->


<!-- Date: Wed Sep 27 06:14:30 2000 -->
Last night we started pumping. Setting up to check vacuum readings on the helium system. 
<!-- Author: sg -->
<!-- Comment: Wed Sep 27 06;33;44 comment by...sg -->
Reading about 700 microns. 
<!-- Date: Wed Sep 27 06:15:54 2000 -->
Found the turbo tripped off this morning with no indication. Resetting and turning back on. 
<!-- Author: sg -->
<!-- Comment: Wed Sep 27 06;35;04 comment by...sg -->
Turbo is back on at high speed. Opened PV70.


<!-- Date: Wed Sep 27 08:16:05 2000 -->
<pre>This is the second backfill and purge of system.cm sg</pre>
<!-- Author: c harles mcneal -->


<!-- Date: Wed Sep 27 08:24:24 2000 -->
Ordered daily fills for tank 18.
<!-- Author: sg -->


<!-- Date: Wed Sep 27 11:13:28 2000 -->
Pumpdown #2 complete. Pumped to 124 microns. 
<!-- Author: Steve -->


<!-- Date: Wed Sep 27 11:37:05 2000 -->
Started third pumpdown.
<!-- Author: Steve -->


<!-- Date: Wed Sep 27 16:20:41 2000 -->
<pre>Watt can is at 8.2u. Pumping watt can.</pre>
<!-- Author: sg -->


<!-- Date: Wed Sep 27 17:46:59 2000 -->
Pumped the system to 35 mTorr. Backfilling now. 
<!-- Author: Steve -->


<!-- Date: Wed Sep 27 17:50:24 2000 -->
<pre>Earlier, couldn't get the north dry engine solenoid operated pneumatic valve to open. Needs troubleshooting. </pre>
<!-- Author: Steve -->


<!-- Date: Thu Sep 28 07:04:01 2000 -->
Turbo pump was tripped again,reset and started turbo from computer all looks find.
<!-- Author: Charles McNeal -->


<!-- Date: Thu Sep 28 09:11:38 2000 -->
Snaffu: I got Pallaver's guys to check out the compressor. Found 2 problems.  1)  Charged the compressor up with clean helium and it leaked by to suction. Valved off the suction valve and it still leaked out. 2) The aftercooler was never changed out. Plastic bags on the end of it contained oil, indicating that it finally corroded and is leaking. Bill Martin will attempt to change out the aftercooler if they have one. 
<!-- Author: Steve -->
<!-- Comment: Thu Sep 28 09;12;39 comment by...Steve -->
Perhaps we have found our 400 scfh leak.


<!-- Comment: Thu Sep 28 13;17;37 comment by...sg -->
It turns out the leak there was minimal. Helium was passing through our control valves.
<!-- Date: Thu Sep 28 13:01:00 2000 -->
<pre>Switch to check out turbo chasis tm 70 it is running so far no problem will try to let run over night.cm</pre>
<!-- Author: Charles McNeal -->


<!-- Date: Thu Sep 28 13:16:10 2000 -->
That little compressor for the arc cell pumped down the entire helium system and put it under vacuum. That's a lot of gas.
<!-- Author: Steve -->



<!-- Date: Thu Sep 28 13:28:14 2000 -->
Carl Pallaver stopped by. He has removed his tag and turned on the water; he left the ball valve closed; that's for us to operate. 
<!-- Author: Steve -->


<!-- Date: Thu Sep 28 17:38:17 2000 -->
<pre>Looked at BA compressor. There is a high side relief from the BA compressor into the tevatron suction header. This has always been there... will call MCR to see if we can find out the page number of someone from Carl Pallaver's group to verify it is OK to start.</pre>
<!-- Author: Bob Kephart -->


<!-- Date: Thu Sep 28 17:46:29 2000 -->
Called MCR and informed them we are starting compressor after calling Carl Pallaver at home.  (630 968 7771) He confirms that the compressor is ready to run and the relief valves have always 
been there and are not an issue.
<!-- Author: RDK -->


<!-- Date: Thu Sep 28 18:57:33 2000 -->
We made collision hall access for cryo. K.C. found the lower limit switch on PV61-V defective and took it out of the circuit. The upper switches work and indicate green on the computer. We installed a utility vacuum manifold and pumped HUT 4, HUT 5, and closed them off. Still pumping on the lead vacuums. Got fans running and turned on the dewar neck heater; heater is set at 150 F. 
<!-- Author: Steve -->
<!-- Comment: Thu Sep 28 19;01;30 comment by...Steve -->
Also insured the manual valve to the watt can was open. Tied back flex leads that were too close to the bus.


<!-- Date: Thu Sep 28 19:28:39 2000 -->
Called Jerry Makara. He tagged out the compressor because of 
relief that vents back to Tevatron suction.  We need to switch 
to the line that goes back to our suction header. Jerry is OK with us doing it and then removing his tag out. We will blank off the line to the Tevatron.
<!-- Author: RDK -->


<!-- Date: Thu Sep 28 20:28:40 2000 -->
OK... We are dead in the water for tonight. We can't locate the correct blank off flange.  Earlier I talked to Jerry again on the phone. They will help us start up the compressor in the morning and now hopefully swap these lines. I asked that they call Bill Noe or me in the AM.
<!-- Author: RDK -->


<!-- Date: Thu Sep 28 21:59:09 2000 -->
Correction: Bruce found the right flange and we made the line swap. The compressor should now be ready to run in the morning. Note that the inventory control valves are still shut off via the nearby ball valves. This should be corrected before starting up the compressor.
<!-- Author: RDK -->


<!-- Date: Thu Sep 28 22:02:25 2000 -->
<pre>Switched from Nitrogen to Argon/Ethane in TOP, BOT, SWA, SEX, SWX, NEX, and CMU per Del Allspach.</pre>
<!-- Author: Dave Haynie -->


<!-- Date: Fri Sep 29 11:08:58 2000 -->
We started the compressor this morning. Flow is going through the adsorber (yes, the adsorber works). Set BA loop parameters with the low slider at a max limit of 70%. The compressor is in remote operation. 
<!-- Author: Steve -->


<!-- Date: Fri Sep 29 12:10:09 2000 -->
<pre>The arc cell reads 90 PPM on BABS storage tank. It has been on BABS for over an hour.  Switched arc cell over to adsorber outlet.</pre>
<!-- Author: R Sanders -->


<!-- Date: Fri Sep 29 12:25:26 2000 -->
<pre>It appears the adsorber LN2 jacet is full (liquid comes out of MV-525-N) when DPI-507-N reads 45" of water.  In APACS I changed the scaling on LLADSR so that it reads 100% on the computer screen when the level is 45" H2O.  Note LLADSBR is a 0-100" H2O DP transmitter and is scaled 0-20% in APACS.</pre>
<!-- Author: R, Sanders -->


<!-- Date: Fri Sep 29 14:02:41 2000 -->
BABS reads 133 ppm, decide to circulate through it to clean it up. Open MV2064-H and throttle with MV2066-H into suction buffer tank so suction is at 4 psi and all the kickback is through BABS.
<!-- Author: RDK -->
<!-- Comment: Fri Sep 29 14;13;07 comment by...Steve -->
BABS is down to 70.6 ppm.


<!-- Date: Fri Sep 29 14:18:51 2000 -->
Found lesk on BABS the lower flange on the dewar was loose torqued the flange to 82 ft. # leak stopped at this time. 
                                            
<!-- Author: Bruce -->


<!-- Date: Fri Sep 29 14:34:54 2000 -->
<pre>Switched IMU and NWX from Nitrogen to Argon/Ethane per Del Allspach.</pre>
<!-- Author: Dean Beckner -->


<!-- Date: Fri Sep 29 15:39:47 2000 -->
Put arc cell on "0" gas and made small adjustmet to zero of arc cell.  put arc cell back on to BABS,
<!-- Author: R. Sanders -->


<!-- Date: Fri Sep 29 16:52:14 2000 -->
I looked at VPT pressure transducer readings in 4-mation: 
 
These have low pressures and need charged; 
TXDELP       hydrogen VPT 
TX4LP        helium VPT 
TMAGIN       helium VPT 
TX2LP        nitrogen VPT 
 
The transducer on these VPTS appear to be malfunctioning: 
TX4HP        helium VPT 
TSCRLN       nitrogen VPT  
<!-- Author: R Sanders -->


<!-- Date: Fri Sep 29 16:55:08 2000 -->
BABS is at 29.3 PPM on arc cell.  PBABS is 91.2 psig.
<!-- Author: R Sanders -->


<!-- Date: Fri Sep 29 17:23:20 2000 -->
Fixed the gas leak on the top & bot and swa argon/ethane supply regulators on the "720" platform. 
 
                                     
<!-- Author: Dave & Bruce -->


<!-- Date: Fri Sep 29 17:40:39 2000 -->
circulating helium through BABS and LABS. Arc cell now reads 22.75 and falling. System is cleaning up. Let it run and we will check it later.
<!-- Author: RDK -->


<!-- Date: Fri Sep 29 19:05:25 2000 -->
<pre>BABS is a 13.58 ppm and dropping.</pre>
<!-- Author: Dave & Bruce -->


<!-- Date: Fri Sep 29 19:38:38 2000 -->
<pre>Found gas leak on the not chamber supply side of the regulator changed fitting and checked for leak found no leak at this time.</pre>
<!-- Author: Bruce -->


<!-- Date: Fri Sep 29 20:06:20 2000 -->
<pre>BABS is at 8.24 ppm and still dropping.</pre>
<!-- Author: Dave & Bruce -->


<!-- Date: Fri Sep 29 20:12:10 2000 -->
Arc cell is now 7.9 PPM
<!-- Author: R Sanders -->


<!-- Date: Fri Sep 29 21:08:21 2000 -->
At about 8:00 PM, the arc cell reading was close to 7 PPM.  Set EVX1 and EVX2 to 20% and opened MV-201-H and EV-101-H.  Cracked open the three engine U-tube valves.  The helium dewar is at 4.5 psig.  There is flow through the leads. Arc cell reading is now 10.15 PPM.
<!-- Author: R Sanders -->


<!-- Date: Fri Sep 29 23:06:53 2000 -->
Continueing to purge the system.  We have gone through the block & bleed panel and cycled valves to purge out trapped volumes.  Arc cell (BABS) = 6.06 ppm  Did a check of the outlet of teh absorber and it showed essentially 0 ppm. 
<!-- Author: RPS -->


<!-- Date: Sat Sep 30 00:31:12 2000 -->
It looks like we have some bad instrumentation. Bob identified 5 bad VPTs (indicating low temp now).  I looked at TX4HP.  Looking right at the transducer, the supply voltage looks good (22 VDC) but the signal reads -14 VDC.  Since the output should be 0 to 5 VDC for a 0 to 100 psig input even if the VPT lost all of its charge the reading on the output voltage should not be -14 VDC.  This looks like a transducer problem. 
<!-- Author: RPS -->


<!-- Date: Sat Sep 30 01:05:33 2000 -->
We have purge flow through all 3 engines.  The north dry seems to have some sort of electrical problem (could not open the inlet shut off valve (Research Controls) using the override button => no electrical signal.  Created temporary solution so that we could purge the engine.  Someone needs to look at this who has knowledge of the interlocks and how power is fed to the engine.  PPM level in BABS = 3.15 ppm
<!-- Author: RPS -->


<!-- Date: Sat Sep 30 01:53:08 2000 -->
System looks pretty good.  Purge will continue overnight.  PPM level at BABS = 2.6 ppm.  Flowing through all three engines, the dewar, the magnet, etc.  Throttling HP with PVX1 and PVX2. 
Bob Kephart will be in on Saturday morning to start cooldown. 
TO DO LIST: 
1) Look into the North Dry engine electrical problem (why shut off valve doesn't open) Might want to spin the dry and wet engines over to assure they start OK 
2) Look at instrumentation carefully = > 5 Bad VPTs marked on flow schematic in yellow.  Check resistors. 
3) Briefly cycle the LN2 valves in the system and verify they work and create exhaust flow at the vent stack. 
4) Check out the auto cooldown program. 
5) Set valves in proper positions for cooldown 
6) Check vacuums in system 
  
<!-- Author: RPS -->


<!-- Date: Sat Sep 30 06:30:47 2000 -->
<pre>system looks good. Arc cell at -0.3 ppm at BABS</pre>
<!-- Author: RDK -->