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UITF ODH Discussion

This discussion focuses on avoiding ODH2 conditions and improving ventilation in the cryogenic system. The assessment needs to be updated to account for additional volume and extra LHe. The concerns include ODH-related ventilation, air replenishment, and comfort.

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UITF ODH Discussion

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  1. UITF ODH Discussion How to avoid ODH2 conditions? August 5, 2015

  2. To refresh your memory… Today Labyrinth with “chicken wire” gate

  3. Cryo lines from CTF along wall GN2 lines along the wall SF6 tank

  4. Helium dewars: 1,000 liters, 500 liters, 50 liters = 1,550 L  ¼ CM LHe capacity, ~ 400 L (?)Total LHe supply from CTF….Nitrogen line at 80 psi thru a 3/8 inch pipe = 22 cfm or 1,320 cubic feet per hour SF6 inside vessel that hold HV power supply: 25 ft3 filled to 70 psi, ~ 54 lbs: total volume if released? 144 ft3 Helium, Nitrogen and SF6

  5. Rough Dimensions Matt’s loose estimate, total volume: 22,896 ft3 Dick Owen made a more exact calculation: 25,704 ft3 Cave 2: 22’ x 54’ x 12’ ~ 14,256 ft3 exit/entrance Cave 1: 12’ x 12’ x 60’ ~ 8,640 ft3 exit/entrance Exhaust vent to high bay Exhaust vent to outside

  6. Approved Labyrinth Fresh air pulled through “chicken wire” gate

  7. Improving the ventilation in Cave2 Add a wall to help direct air flow Add ductwork leading to rear of Cave2

  8. Dick Owen performed a preliminary assessment…he considered LHedewars, GN2 and SF6.

  9. ¼ CM cold by January 2016HDIce moved into place starting May 2016SSG building an ODH system, I assume they have planned for enough heads and in the right locationsHow to avoid ODH2? What accidents are we required to plan for? Can the old ODH assessment be updated to account for additional volume and extra 1550 L of additional LHe? Save a bit of time and labor?Ventilation concerns: ODH related, replenishment of air non-ODH related, comfort? Is it clear what problems we are trying to fix?

  10. Concrete demolition complete • Stairs are next (complete in FY15) • Bi-weekly meetings scheduled

  11. Cryo lines compatible with old and new ¼ CM… Looks similar to our “upgrade injector” front end

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