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

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)

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