- Make sure the outside gHe tanks are above ~30psi.
- Check LCW Temperatures on the meters right next to the stair-case and also via the following link.
Dark Yellow line: T_in
Purple line: T_out
https://e906-gat1.fnal.gov/data-summary/e1039/slow-cont-acnet.php
If T_in > 95F or T_out > 115F, do not start the QT system. It will see temperature alarms on the compressors (see this page how to clear alarms for compressors) - Below are set of images of the operating configuration of valves on HR3
Important ones to keep open:
V30 (gHe-in to purifier)
V31 (gHe-out from purifier)
Vliqv1 (or the yellow path in the following diagram)
- Make sure the purifier Dewar LN2 space is between 70%-90% (see LN2 fill procedure)
- Open V9a and V21a on Purifier screen on the PLC: This is because the purifier is currently operating in "Manual" mode when the entire system is on "Auto"
- Check the QT main manifold to make sure proper valves and regulators are opened/closed.
- Check the gHe purity before starting the system: This purity check consists of three measurements.
a) Via SVSample: Open SVSample > Open REGPM (green regulator) > Open flow controller > connect the portable purifier setup
b) Via Liquefier A: Make sure Liquefier is on Run+Manual mode > Open SV501A > Set the FC501 to 20slm > Open Open BV502A > Open FC502A > Open SRV512A > connect the portable purifier setup
c) Via Liqefier B: Make sure Liquefier is on Run+Manual mode > Open SV501B > Set the FC501 to 20slm > Open Open BV502B > Open FC502B > Open SRV512B > connect the portable purifier setup
[If the system was stopped for some time, then see the relief + pressurizing procedure] - If everything looks good upto step #7 then
a) Make the Full system to "Run + Auto"
b) Make each liquefier to "Run + Auto + Liquefy"
- Make sure all cold-head compressors are running
...