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C 6 F 14 Liquid Circulation System: status and perspective in Run-3 HMPID PLENARY MEETING

C 6 F 14 Liquid Circulation System: status and perspective in Run-3 HMPID PLENARY MEETING December 14 th , 2018 C. Pastore. TOPICS. Liquid circulation system in Run-2 C 6 F 14 consumption Maintenance activities planned for LS2 Summary. L iquid C irculation S ystem in Run-2.

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C 6 F 14 Liquid Circulation System: status and perspective in Run-3 HMPID PLENARY MEETING

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  1. C6F14Liquid Circulation System: status and perspective in Run-3 HMPID PLENARY MEETING December 14th, 2018 C. Pastore

  2. TOPICS • Liquid circulation system in Run-2 • C6F14 consumption • Maintenance activities planned for LS2 • Summary

  3. Liquid Circulation System in Run-2 Filling and purifying station Transparency system Distributionstation Pumping station Cold trap Ar distribution station 70 pressure sensors 44 temperature sensors 35 pneumatic valves 64 electro valves Flow meters, hygrometer and oxymeter LCS is fully operated by a dedicated PLC based Control System

  4. Liquid Circulation System in Run-2: 2015-2018 STAGNANT for 12 months RECIRCULATION for 16 months Thanks to an accurate system design the circulation system for the Cherenkov liquid radiator C6F14 has shown an excellent stability and let an easy maintenance. Observed: abnormal behavior of some sensors (temperature, pressure) and Electro valves manifold malfunctioning RICH 0 RAD0 9999 °C

  5. C6F14 consumption until end Run-2 and expected consumption until end of Run-3 8 months/year in Stagnant mode or radiators emptied During Run-2 (4 years) C6F14 consumption 300 l/years 4 months/year in Recirculation mode ? months/year in Stagnant mode During Run-3 (3 years) ? months/year in Recirculation mode Liquid Recirculation system must be run in recirculation mode < 4 months/year C6F14 in stock: 900 l

  6. Maintenance activities done on the C6F14 LCS Handling and transport operation SXL2

  7. Maintenance activities planned for LS2 Transparency system Filling and purifying station Maintenance needs to ensure the right functioning of the Liquid Circulation System for the next Run-3. Distributionstation Cold trap Pumping station Ar distribution station

  8. Maintenance activities planned for LS2 Pumping station

  9. Maintenance activities planned for LS2 Ar distribution station In order to optimize the working day the intervention will be done in the same period of the pumping station maintenance.

  10. Maintenance activities planned for LS2 Filling and purifying station + Transparency system

  11. Maintenance activities planned for LS2 Coldtrap In order to optimize the working day the intervention (disconnection) will be done in the same period of the filling and purifying station maintenance

  12. Maintenance activities planned for LS2: summary

  13. Summary • Thanks to an accurate system design the circulation system for the Cherenkov liquid radiator C6F14 has shown an excellent stability and let an easy maintenance • In Run-3 the liquid Recirculation system must be run in recirculation mode < 4 months/year • HMPID maintenance activities should be finalized and discussed with ALICE integration • In order to avoid C6F14 consumption the whole liquid must be sealed in the filling tank

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