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LHC Tech Stop July 2011

Detailed summary of major works including compressor issues, pump refills, and system validations during LHC Tech Stop July 2011.

johnnywilson
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LHC Tech Stop July 2011

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  1. LHC Tech Stop July 2011 Action plan for major stops (+multi instrum & other works) Empty QRL_C SAM DFB SAM DFB Deg Pump 1.8K Refill QRL 15mbar RF 1.8K 70mbar 15mbar ? Test ? repump <50mbar RF Powering Quench Powering Quench SAM DFB SAM DFB Deg Pump Deg Pump ? 1.8K Ref. CP7 Ref. 70mbar 15mbar LHCCryo - TechStop July 2011

  2. And reality … Specific oil injection (22bar) to balance axial forces, Need to send more oil than pass through to screws ! Major finding: the screw compressor (P8, oil filters clogging mid June) was found damaged, with bearings showing exceptional stress About 35’000 hrs, bearings calculated for 70’000 hrs Inlet (4bar) • Similar case than P4_Xmas: • Series problem ? • Too much axial force ? Confirmed by observations on oil circuit => Decision to treat similar compressors a.s.a.p Outlet (20bar) LHCCryo - TechStop July 2011

  3. Compressor station of LHC 18 kW@ 4.5 K Bldg: 15 x 45 X 9 Pinput : 4.5 MW Cool: 500 m3/h Noise: 105 dBA Pipe & fittings redone with larger diameters P8(1) done this Tech Stop, 2nd to factory, P4(1) & P18(2) done in shadow of P8 recovery, P6 to be done latest at Next Tech Stop LHCCryo - TechStop July 2011

  4. P8 configuration, week-end Extra flow Until compressor repaired! Limitations Validated for P2 (TS) ! Leaky HX (Jan’11) TuA (Spring11) 6CV215 valve (P2) Tests for relocation CCs CCs QUI Sector 81 Sector 78 Some minimum flexibility recovered during Tech Stop LHCCryo - TechStop July 2011

  5. LHC Tech Stop July 2011 Tentative d’illustration des activités Cryo LHC Empty QRL_C SAM DFB DFB SAM  Deg Pump 1.8K Refill QRL 15mbar 15 mbar 70 mbar CP CP  RF  1.8K 70mbar 15mbar Re-pump ? Test ? repump <50mbar New CP  70 mbar 15mbar RF 1.8K UPS Powering Quench Powering Quench    SAM DFB SAM DFB Deg Pump Deg Pump ? 1.8K Ref. CP7 Ref. 70mbar 15mbar  Rev2: P5_UPS effect + refinement 12/34 Rev3: QRL_12 test stopped earlier + P4/P18 QSCB oil pipes LHCCryo - TechStop July 2011

  6. Status & Forecasts Overall situation under control, checking singularities here and there P8: Should be back Friday evening (22h t.b.c) Special: ALL triplets + D4Q5_R4 emptied, warmed-up 25K, pumped VAC LHCCryo - TechStop July 2011

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