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  1. Shut Down and Restart Procedures
  2. Helium Liquefier (QT) System Summary
  3. How to fill LN2 to the Purifier and Magnet LN2 spaces
  4. How to fix the QT-HMI if its screen got frozen
  5. Fixing dewar level indicator
  6. How to restart the QT PLC
  7. How to fix if the outlet flows of Liquefiers are showing strange values
  8. HR3 operations
  9. Filling LN2 to the purifier using a portable Dewar
  10. QT System Starting Procedure
  11. Liquefier Cleaning when Dewar contains LHe
  12. Cleaning QT purifier Helium-space (pumping-purging the purifier).              Cleaning QT purifier Helium-space (OLD)
  13. Cleaning QT purifier LN2 space
  14. Fixing dewar level indicator (related to (9))
  15. Dewar Cleaning Procedure (using the transfer line)
  16. Cold-helium Circulation Procedure (Cooldown Transferline)
  17. Cleaning gHe outside tank using the purifier
  18. Resolving Liquefier Blocking Alarm when Liquefier is on Liquefy Mode
  19. Resolving Liquefier Blocking Alarm when Liquefier is on Idle Mode
  20. Purifier LN2 Fill Procedure-updated-labels.pdf ( Please use this updated one, or the original one on docdb 10337 by Jordan Bohn)

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  1. The volume of an outside gHe tank: 1600 cubic feet (V = 45306.95 L)
    1 psi of gHe at 300 K in the outside gHe tank = 4.1 L of LHe — R_gL = 4.1 L/psi at 300 K
    P_atm = 14.7 psia
  2. C_gL = 750 — 1 L of LHe = 750 L of gHe @ 300 K, 1 atm
  3. P_gHe ~ 100 psig (not psia)
  4. L_LHe = V * (P_gHe + P_ATM) / P_ATM / C_gL
  5. R_gL = L_LHe / (P_gHe + P_atm) = V / P_ATM / C_gL = 4.1 L/psi
  6.  The pressure increase in the gHe tank per tube (in the tube trailer) is 10psi (i.e. 10 psi difference per tube)
  7. 100 slm rate on Magnet FC is equivalent to ~ 192 LHe liters per day (i.e. assuming both LQ A and B are running)
  8. QT recommendation to keep system minimally pressurized: ~20 psi
  9. Running from 40 psi down to 20 psi would produce about 80 liquid litters and we should be able to do that in about 10 hours (assuming both LQ A and B are running).
  10. Putting a 2200 psi gas bottle into the system will produce 8 liquid liters per bottle.
  11. HR3.docx (It's a copyright of QT-technology. Please do not make it public. )

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To check LCW parameters: https://e906-gat1.fnal.gov/data-summary/e1039/slow-cont-acnet.php 
(click on NM4LCW or select  )

QT LCW requires are 7.8kW of cooling per coldhead compressor, will less than 77F on water inlet and at least 6L/min of flow. 

To check HMI parameters: https://e906-gat1.fnal.gov/data-summary/e1039/target-QT-HMI.php  (select:

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