SC - 21Jun'11 LHCCryo P8 oil filters

Compressor station of LHC 18 kW@ 4.5 KBldg: 15 x 45 X 9 Pinput : 4.5 MW Cool: 500 m3/h Noise: 105 dBA

SC - 21Jun'11 LHCCryo P8 oil filters

Compressor station flow scheme

Main filters (100µm) and oil pumps

Indiv. Filters (40µm) and fine filters (20µm)

1st signs on CP6 seen Fri 17/06, on CP7 Sat, and cause found Monday 20/06 CP7 is the origin of pollution, presently stopped, to be looked at TechStop

…

GHe

Oil

H2O

SC - 21Jun'11 LHCCryo P8 oil filters

QUI

Leaky HX (Jan’11)

TuA (Spring11)

P8 configuration, last week

CCs CCs

CV615 valve (P2)Tests for relocation

Validated for P2 (TS) !

Sector 78 Sector 81

SC - 21Jun'11 LHCCryo P8 oil filters

QUI

Leaky HX (Jan’11)

TuA (Spring11)

P8 configuration, week-end

CCs CCs

CV615 valve (P2)Tests for relocation

Validated for P2 (TS) !

Sector 78 Sector 81

Extra flow

Until next Tech. Stop if CP6 oil filter OK,

otherwise …

Similar to CP6_P4 ? Some 35’000 hrs since Jan’07 !!!

Limitations

SC - 21Jun'11 LHCCryo P8 oil filters

P8 oil filters

Looking stable now !

CP6 filter

global filter

CP7 restart

SC - 21Jun'11 LHCCryo P8 oil filters

0

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30

40

50

60

70

20-Jun-1109:00

20-Jun-1110:00

20-Jun-1111:00

20-Jun-1112:00

Temperature [K], heating [W], Valve [%]

1.00E-10

1.00E-09

1.00E-08

1.00E-07

1.00E-06

1.00E-05

LQXAB_01L8_EH847.POSST

LQXAB_01L8_TT847A.POSST

QRLGF_03L8_CV947.POSST

QRLGF_03L8_CV947AO.POSST

QRLGF_03L8_TT947.POSST

VGPB.120.4L8.X.PR

VGPB.222.1L8.X.PR

Cryo bake-out L8During stop: Temp BS >> Temp Mag

=> Bearly visible effect, re-cooling process confirmed ?

“Bake-out” at 35K-40K

Heater

Tinlet Toutlet

Vac. gauges

Valve