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Gas systems project
GAS M&O meeting 23 April 2020
Present: Beatrice, Roberto, Andrea, Patrick, Kacper, LPh, Fred, Michal, Mara, Gianluca, Sabino, Fabio, Federico, Leonardo
Indico: https://indico.cern.ch/event/910393/
CHECK Gas Systems
ALICE #2411
TOF
- GC analysis: SF6 at 6%
TRD
- several problems with profibus: change of 9 connectors: https://eloggas.web.cern.ch/GAS_PIQUET/1050
- Profitrace didn’t work because memory was saturated: to investigate how to do
- check of profibus before and after replacement of the connectors: everything looks ok. Then Patrick changed the profibus connectors where the resistance was bad
- Also PT1009 in the mixer has a electrical isolation default and it was changed (in WinCC-OA the value was correct)
- In WinCC-OA we saw peaks in the mixer node (https://eloggas.web.cern.ch/GAS_PIQUET/1048): this can be used as indicator of profibus problems —> Michal to check how to implement in WinCC-OA
- Patrick/Michal to prepare a presentation of profibus test and spikes in mixer node
ATLAS #2410
MDT
- Still overshoot in pressure when system is re-started. Need to investigate on place when we are back. In the meanwhile to prepare a summary —> Kacper and Gianluca
- pump at 100% at the re-starting, no problem
- distribution: problem in sensors rack 66ch16 and rack63ch16. To do a reset when we are back. To prepare a list of sensors that stop to work or drift in order to have a clear overview —> Kacper
- several warning received on the drift of pressure sensor PT6304ch16: these are due to the not working sensor. These warnings are useful for ATLAS system but not for the piquet —> Michal to investigate if we can have two lists of warnings: one for the piquet (very important for operation and to anticipate interventi to avoid a stop of the system) and one for standard operation
PGS
- after power-cut, problem with level transmitter on N2 dewar, solved by cleaning the connector. David already contact since also cables are not in good status
CMS #2412
RPC
- with the power-cut some racks went underpressure -2 mbar, this is probably due to leaks in the detectors —> Andrea to prepare list of racks with this problem
DT
- after a power-cut we need to increase the flow in the mixer because we loose a lot of pressure in the buffer —> to investigate when we are back
LHCb #2406
- no power-cut, only lost of communication with PLCs
- RICH1 pump cooling, on-going (email of 19/03)
GENERAL
- Discussion on PROFIBUS:
- Profibus check has to be done before and after the change of PLC but it is not enough
- Need to test all resistance in profibus connectors. Not done for all system where we changed the PLC —> to plan to do
- Test on Profibus status in OT in order to have a procedure of all tests needed
- To check how to implement in WinCC-OA an alarm/warning when we have peaks in the profibus node (example https://eloggas.web.cern.ch/GAS_PIQUET/1048) —> Michal
- Patrick/Michal to prepare a presentation of profibus test and spikes in mixer node
- Discussion on warnings:
- To investigate if we can have two lists of warnings: one for the piquet (very important for operation and to anticipate interventi to avoid a stop of the system) and one for standard operation —> Michal
From previous meeting:
- Level of PGS sometimes is > 100% —> Michal to check
- PGS list of sensors not working/not existing: missing ALICE, CMS and LHCb
ACTIONS:
- Patrick/Michal to prepare a presentation of profibus test and spikes in mixer node
- Gianluca/Kacper to prepare a summary of ATLAS MDT pressure overshoot problem
- Kacper to prepare a table of ATLAS MDT pressure sensors with problem and keep it updated
- Michal to check if we can have two egroups for the warning
From previous meeting:
- To prepare a list of sensors not working or missing in PGS —> Experiment technical responsible
- Excel file for alarms prepared weekly by Mara —> Experiment technical responsible to fill
REMINDER for when we will be back
ALICE
CPV
- We have 3 lines input that are ok, and 3 lines output: in one there is not the return. LPh contacted Yuri
TPC
- In the purifier the small thermic box triggered (also last year it happened) —> Patrick/LPh to check
TRD
- Recuperation: missing two valves but there are present in the software
- 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
ATLAS
MDT
- Check overpressure in MDT chamber when there is a stop-start of the system
- Only one convertisseur, one pump, etc from the system —> Patrick/Kacper to fix
- Found a problem of grounding on pressure sensors: pressure sensors changed. Now to verify if the grounding problem is still there
- Problem in the 2 vaisala of humidifier: several spikes present. Not clear why. Before the software upgrade they were not present
RPC
- Fill 3rd purifier
- IR analyser to move in exhaust module: to schedule later when there will be PLC change
CMS
RPC
- Michal changed the mother board in rack 67: now flow is 170 l/h (elog #2279) —> Andrea to check with new voegtlin red
- Calibration of IR and GC for iC4H10 —> Mara
- Change material of purifier 1 and 2 and fill 3rd (only when RPC will be in stop, probably September/October)
DT
- Change one motherboard in rack 61 but flow didn’t change (elog #2280) —> to try to recalibrate one set of flowcells
- 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
GEM
- Andrea prepared a drawing for ME0 and check for space in UX —> Andrea to send an email to Michele
CSC
- On-going regulation of PID for the exhaust —> Beatrice
- Warning to set-up —> Beatrice/Michal/Roberto
CF4 recovery
- Install new storage battery —> Andrea
- New MFC installation
- To fix leaks in column B of CF4 absorber
- Test new compressor
- GC analysis of recuperated CF4
PGS
- Check Freon supply > weight on side A/B (Mara)
GENERAL
- Check of bande-chauffantes under floor and panel in
LHCb
MWPC
- Problem in the GC analysis of the mixer: not visible the correct gas mixture with both LF and HF. Probably an hardware problem (connection, valve, etc) to find —> Mara
- Leak in Mixer and Exhaust. Only in Exhaust found but not repaired. Other not yet founded —> Patrick
RICH2
- To inject Air —> Patrick to check with C. Frei
- To add line for analysis “supply to detector”
SciFi
- Problem on 3-ways valve —> Patrick
PGS
- Interlock of Ar/H2 does not work —> Michal/Patrick to check
GENERAL
- Alarms/Errors in power supplies for all gas systems —> Patrick
- Profibus check has to be done before and after the change of PLC —> Michal
- Check of all Profibus connectors —> Patrick
- Aging test of: black flowmeters Omron, LHCb CO2 IR, RPC new exhaust flowmeter, LHCb Coriolis
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