When both Liquefiers are running

Inlet flow for each Liquefier for a production rate of ~4L/Hr = ~ 48 slm

The minimum pressure in the outside tank to have the production rate ~4L/Hr  =  ~ 88 psi

When starting the system, ensure to keep the tank pressure above 88 psi to have the production rate ~ 4 L / Hr

To Start a Magnet Cooldown.

  1. Have the following amounts:
    Dewar A (200 L). + Dewar B (200 L) + Tank (352 L equivalent to ~88 psi) = 752 L

  2.  The vapor flow rate should be equivalent to the production rate to keep the Dewar level at a constant level, and also cool down the magnet at the same time.
     (a) Use ~48 slm magnet outlet flow if you use only a single Dewar.
     (b) Use ~96 slm magnet outlet flow if you use both Dewars

This configuration allows for dumping all the liquid of ONE Dewar into the outside tank in a situation of a Dewar evacuation. In that situation, the tank pressure will be 138psi while the other Dewar would contain ~200 L and remain in the idle mode.


 

As of today, we have ~50 psi in the outside tank, therefore, the optimum setup requires ~138 psi more helium (because the total amount needed in gaseous form is ~188 psi) to be added to the system,  i.e, ~ 552 L in liquid form.
We can purchase 2x250L Dewars and then for the rest of the 52 L ( or ~13 psi), we can get from the tube trailer (2 tubes if the trailer pressure is 1800 psi, or 3 tubes if the trailer pressure is 900 psi), or using 13 cylinders.



Useful UVA-elog entries

http://twist.phys.virginia.edu:8081/General/1319

http://twist.phys.virginia.edu:8081/General/1038


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