Home

PH Detector Technology Group

LHC Gas Systems, Maintenance and Operations

 

16 25 16

The Gas Piquet

 The Group PH-DT holds a Piquet Service that is common to all LHC gas systems. The service consists of:

  1. The PIQUET runs 24h, 7 days a week.

  2. The PIQUET is composed of a Expert Technician that acts as first contact with the experiments and a physicist on-call. The team changes every week, on Friday mornings. The schedule is available here.

  3. If the Piquet is called, the intervention shall take place (remotely or in situ) within 1 hour after the call.

Procedures for the Piquet

  • Every morning connect remotely to the Controls of each experiment.

  • Check that the gas systems do not show alarms.

    • In case of ALARMS:

      • Study first the cause of the ALARM and inform the sub-detector concerned by phone and/or making an entry in the corresponding Elog.

      • When ready, acknowledge the alarm and restart the system.

  • Check the present status and compare it with the expected status, as shown in this Table. The information in this table must be updated as needed!!!!

    Click on every module and verify:

    • Mixer: ratio of gases, pressure and total flow sent to the loop

    • Exhaust: pressure values in the low and high pressure sides, the amount of gas exhausted through the MFC, circulation flow (FIT 5010)

    • Pump: membrane pressures and temperatures

    • Distribution: racks on/off, flow cells values, cell selection (to check that all cells are not in error), gas loss rate

    • Purifiers: status of columns

    • Analyzers: water content, O2 content

    • Humidifier: ppm of water

  • If anomalies have been observed, understand their cause and please inform the users of the sub-detector concerned.

  • The piquet shall register all interventions into the appropriate electronic tool: the electronic logbook, whenever the intervention relates to the gas system and affects the detector, into the Gas Section Remedy service if a formal intervention of other people in the service is needed, and in the MTF equipment maintenance database.

 Gas Systems Operational Procedures

 

Last Updated Tuesday, June 30, 2009 by MC