You can make various viewpoints of the full system strip charts using this page: https://e906-gat1.fnal.gov/data-summary/e1039
LCW
Two target sub-systems use LCW (Low Conductivity Water) for cooling.
1. Helium Liquefier System (UVA-QT): see QT System Manual for more details.
2. Roots pump-system: see Pumps System Manual for more details.
If you are on the cryo-platform, take the stairs (towards the lower level) and stop mid-way when you see these gauges towards the east wall of the hall.
You will see labels ”LCW Supply” and “LCW Return” on those two separate piping.
Both “LCW Supply” and “LCW Return” have a pressure gauge and a temperature gauge.
The nominal values (as of 01/06/2024):
| Parameter | Avg. Value |
|---|---|
| Inlet Pressure | ~ 65 psig |
| Outlet Pressure | ~ 48 psig |
| Inlet Temperature | ~ 79 Fahrenheit |
| Outlet Temperature | ~ 89 Fahrenheit |
The nominal values for the outlet LCW temperatures from the QT coldhead compressors should be below 100 Fahrenheit (see the image below)
If you notice this increase above 105 Fahrenheit, then the coldhead compressors will be tripped soon.
The nominal values for the LCW for the roots pumps system should be as shown in the following pictures.
Location: at the roots-pumps (cryo-platform: westbound)
Note: The 2nd flow meter from the right is from the rotary vane pump and it usually takes about 5-10mins to show a flow after it is started.
You can monitor these outlet flow from the strip charts remotely, and a sample screenshot is shown below.