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Gas systems project
GAS M&O meeting 27 January 2020
Present: Beatrice, Roberto, Fred, Patrick, Kacper, Andrea, Michal, Mara, Federico, Fabio, Sabino
Indico: https://indico.cern.ch/event/882558/
ALICE #no elog
- MTR
- Start with standard gas mixture on Tuesday
Reminder:
-
- Alarm in power supply: DC MCB trip —> Michal/Patrick to check
- exhaust pressure regulation does not work
- mixer pressure regulation does not work: Zimmerli not installed
- CPV
- Probably water in pipes —> try to flush with N2
- Mounting the humidifier in the workshop
- TPC
- Still leak present, system is running in Ar
- In the purifier the small thermic box triggered (also last year it happened) —> Patrick/LPh to check
- TRD
Reminder
-
- Purifier: to review if keep the safety valve or the rupture disk
- Purifier: safety valve at the input where we have Ar or Ar/H2 at high pressure —> LPh to check with safety
- Alarm on power supply
ATLAS #2209
- MDT
- Working on the modification of pump module
- Add a second H2O sensor for the exhaust and use this one to regulate
- 3 MFCs calibration done, missing the one of Humidifier —> this week
- Still some work in the electrical part to do
- Found a circuit breaker almost broken —> bought a new one: it will arrive next week
- Found a problem of grounding on pressure sensors —> a lot of investigation/work is needed
- General
- Power of bande chauffant —> Patrick/Kacper
- Several electrical problem in ATLAS:
- See elog 2205, 2206, 2207
- Patrick to prepare a protocol for the student to identify the failures
CMS #2202
- RPC
- Test on rack 67: flow measured 40-50 l/h instead of 4-5 l/h (read by the flowcell)
- Problems in doing measurements with Drycal: system stopped several times
- To buy a voegtlin red for the test of flow tests
- At this point the problem is electrical —> Michal to investigate
- Roberto proposed to add flow sensors at the input and output of the distribution
- iC4H10 MFC changed with the second one: still problem (percentage at 4%) —> maybe problem is in R134a MFC —> to try to move to the second R134a MFC
- Reminder:
- Missing quick manifold and flowcell in barrel +1 and +2
- Swap of pipes in rack RE-1 (racks 61 and 65) and RPC 3.1 (racks 63 and 87)
- Rack 85: to check if dummy chamber is installed, if yes to add pressure sensor connection
- Test on rack 67: flow measured 40-50 l/h instead of 4-5 l/h (read by the flowcell)
- DT
Reminder:
-
- Difficult to re-start the gas system after power-cut —> to do some tests
- Test for power cut and re-start for the exhaust line —> to do other tests
- CSC
- Broken bubbler in rack 67 supply —> to mechanical modify the rack to have a protection (not possible to have the standard parete)
Reminder:
-
- Warning to set-up —> Beatrice/Michal/Roberto
- GEM
- System stopped on Friday during the maintenance procedure of TOTEM mixer
- Piquet didn’t receive SMS
- System re-started on Saturday after the weekly check
- System stopped on Friday during the maintenance procedure of TOTEM mixer
LHCb #2204
- RICH1
- last week: 1.5% of Air like before, even if we stopped the system
- new MFC installed: it is 33 l/h —> to block at 5 l/h
- General
- Next week replacement of AUX PLC: Michal will send to Schneider the one that crashed
Reminder:
-
- Interlock of Ar/H2 does not work —> Michal/Patrick to check
- Problem with Profibus cable/connector module —> to understand where —> Patrick
PIQUET
- Several alarms of flammable gas in ALICE: all alarms were blocked by Andrea —> LPh to check and fix
GENERAL
- Presentation of LPh about the 2019 activities of ALICE
- Presentation of Sabino about CMS RPC regulation valves
- Econex valve to test this week in the lab
- Mixer maintenance
- Tried the procedure in CMS T1
- Add flammable detection for flammable gases: to put outside the detection head or purge
- Add purge to the mixer
- Presentation of Fabio about presence of leaks in CMS RPC
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