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Subject: sPHENIX discussion of the superconducting solenoid
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[[Sphenix-magnet-l] ] FYI: SPHENIX LN2 EXCHANGER LEAK and replacement
- From: "Yip, Kin" <kinyip AT bnl.gov>
- To: "sphenix-magnet-l AT lists.bnl.gov" <sphenix-magnet-l AT lists.bnl.gov>
- Subject: [[Sphenix-magnet-l] ] FYI: SPHENIX LN2 EXCHANGER LEAK and replacement
- Date: Tue, 12 Nov 2024 14:17:38 +0000
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From: Mohamed, David <dmohamed AT bnl.gov>
Hi Roberto,
Can you provide a synopsis/overview of the new setup (configuration/location) and how it will cool/interact with the helium loop in sPHENIX.
Will need specifics on the location of the exchanger, capacity of the exchanger, expected pressure within the exchanger. I see the source inventory is the same (6,000 gallon dewar) so the ODH analysis shouldn’t be impacted as long as the leak rate is still capped by the same upstream mechanical valve. I do need to capture an immediate area exposure (reason for the above requested parameters).
In the original ODH Analysis the biggest factor was human error due to crane operations/machine ops. How will the temporary exchanger be protected against…. A forklift or similar equipment movement?
Copy and Pasting some of your notes below along with some q’s:
The helium components count would increase a bit. 2 helium lines and the N2 relief becomes a helium relief when we isolate the N2 exchanger. Are the additional helium components at any increased for equipment rupture due to unintentional contact?
N2 components: Same: we have a N2 relief on this gas cooler dewar.
N2 vent line connection: Gas cooler vent line substitute for the existing vent line which will be disconnected. Where will the new vent be located?
LN2 supply line No change: goes from the west wall bayonet to the gas cooler instead of the existing exchanger.
Thanks,
David M
From: Fliller, Raymond <rfliller AT bnl.gov>
Kin, et.al.,
David will be writing the USI Evaluation for this. Thanks David.
Ray
Raymond Fliller
From: Yip, Kin <kinyip AT bnl.gov>
Dear Ray and Dave,
Can you please help approve the USI as soon as possible (as there is no real change) ??
The Magnet temperature is slowly increasing when there is no cooling while we’re waiting.
Kin
From: Than, Yatming (Roberto) <ythan AT bnl.gov>
Ray,
Results would not change much. All we are doing is swapping the exchanger in the cryostat with a separate exchanger outside the cryostat in this gas cooler dewar. The source inventory is the same: the 6000 Gal LN2 storage dewar outside. LN2 Release rate: flow was conservative and is dictated by the control valve at beginning of the storage dewar supply line. No change
The helium components count would increase a bit. 2 helium lines and the N2 relief becomes a helium relief when we isolate the N2 exchanger.
N2 components: Same: we have a N2 relief on this gas cooler dewar. N2 vent line connection: Gas cooler vent line substitute for the existing vent line which will be disconnected. LN2 supply line No change: goes from the west wall bayonet to the gas cooler instead of the existing exchanger.
From: Fliller, Raymond <rfliller AT bnl.gov>
Roberto,
If we move that dewar into 1008 and put it on the platform, we will need to redo the ODH analysis for 1008.
Ray
Raymond Fliller
From: Than, Yatming (Roberto) <ythan AT bnl.gov>
Everyone, Heads up. Starting the Nitrogen cooling for sPHENIX: We were not able to hold charge in the circulation loop. There seems to be a leak in the N2/He exchanger.
To be able to keep the magnet at 100K, I have a possible solution.
We have a LN2 bath cooler dewar that can cool helium gas, currently in 912 bldg. Need to modify the circuits up in the platform. Need to find/get hold of a mating bayonet so I can make a line to get the LN2 supply main. The last section of LN2 line is bayonetted, so I can make up a new feed to the gas cooler dewar.
USI Marked up P&ID drawings.
RIGGING WORK PERMIT PLAN Lift 200L dewar to platform level.
CRYO WORK PERMIT Marked up P&ID drawings for LOTO valves LOTO LN2 supply lines LOTO Helium valve so we can tee in helium supply out and cold gas in.
120V extension cord to power the level controller and solenoid valve for LN2 bath cooler.
Fluid Circuits: LN2 supply line: End 1: Mating male bayonet === End2: compression fitting to dewar.
The helium circulation supply I can take of a relief turret, by putting in a tee. The helium circulation cold gas (90K) I can take also enter the solenoid via a relief turret, by putting in a tee also. Warm helium gas line: SS braided flexline 1/2" NPS or larger Cold helium gas line: SS Vacuum jacketed braided flexline 1/2" NPS or larger. 300K helium gas tap into tee for relief H3663R (Heater outlet) Connection to gas cooler dewar inlet.==> 80K Gas out of dewar: Need a VJ flex line / mech insulated flex.==> The 80K helium gas into solenoid would tap into tee for relief H3657R= warm gas supply after the warm gas valve H3611A.
N2 gas vent: Need to pipe it into the vent header somehow. Remove the first bayoneted section and close off the exchanger vent N3250M. Tie-in the Gas cooler vent to the permanent vent header: Bayonet connection.
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- [[Sphenix-magnet-l] ] FYI: SPHENIX LN2 EXCHANGER LEAK and replacement, Yip, Kin, 11/12/2024
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