Page History

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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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To check LCW parameters: https://e906-gat1.fnal.gov/data-summary/e1039/slow-cont-acnet.php 
(click on NM4LCW or select F:NM4LCWFLOW F:NM4LCWP1 F:NM4LCWP2 F:NM4LCWP3 F:NM4LCWT1 F:NM4LCWT2 )

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:TI502 TI504 TI506 TI508 TI510 for both Liquefier A and B)

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