ALICE TC Meeting – CV Detcool1 LHC stop 31 May, 1-2 June – CV/DETCOOL Interventions Cavern interventions: 31 9:15: Sampling with RP (Isabel) on SPD, SSD/SDD and TRD cooling plant  Wait for the results (afternoon or Tuesday morning) before any intervention !!! SPD + CV: replace filters PP4 + put new C 4 F 10 into cooling unit  Claudio. Please don’t stop the plant before the sampling !!! SSD/SDD: New !!!!! New Special Filter for SSD  Cancelled – Filter to be manufactured by Main Workshop. Problem with temp. transmitter on loop 33 SDD  Need to stop the plant ??? TRD: problem with resin filter  sampling for analysis problem with the temperature of chilled water  Control of temperature with calibrated sensor

SSD – Problem with S2 loop (Ton Van Den Brink) ALICE TC Meeting – CV Detcool2 The real problem is flow too low in some ladders. Ton noticed that the circulation is better after cleaning of the plant filter: Pressure regulator S2 at its set point. We suspect a problem with the draining of air on these ladders. Possibly the pressure regulator not working correctly.  2 ALICAT Pressure regulators have been sent back for checking and calibration.  Manufacturing of new filters Before cleaning S2 follows the patron of the return regulatorAfter cleaning of filter S2 is regulating.

SSD – Filters on water (Ton Van Den Brink) ALICE TC Meeting – CV Detcool3 Transmission: support cylinder : 23% 50μm mesh : 60% Overall : 14% The original Transmission: support cylinder :75% Spacer grid : 65% 50μm mesh : 60% Overall (65x60) : 40% The best but very difficult to manufacture Proposal of Main Workshop To be investigated Transmission: support cylinder : 40% 50μm mesh : 60% Overall : 24% The current one  Industrial Solution: Install an adapted filter (cartridge + element)

SDD – Temperature of loop 33 (Serhiy Senyukov) ALICE TC Meeting – CV Detcool4 Last shut down we checked that the flow is correct.  Check the converter  Change the sensor  NEED TO STOP THE PLANT

TRD – Level of water conductivity ALICE TC Meeting – CV Detcool5 Resin cartridge, even new, doesn’t work properly. Level 0.8 µS/cm is still OK But a pollution to understand  Sampling for bacteriological analysis 1 st change 2 nd change No filter

TRD – Temperature of chilled water ALICE TC Meeting – CV Detcool6 We are too close to the 8°C PlantChill water Temp. WarningAlarmUser range TRD7.5 °C 8°C 21°C16/22 SSD/SDD7.0 °C 12°COn plant outlet14/22 TOF5.7 °C 12°C 14°C14/22 Check of the temperature transmitters with the KIMO tool Review of the different levels (warning, alarm, range) with the users Chilled water is at 5.5°C at the outlet of the CV plant in surface