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TB: LHC thermalised racks

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866/2-D05 (CERN)

866/2-D05

CERN

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Description

A review of the status of the LHC thermalised racks for the BPM and BLM systems.

The presentations will cover current status, plans for LS3 maintenance and mid term change proposals.

TB: LHC thermalised racks
Zoom Meeting ID
68435716423
Host
Andrea Boccardi
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Presentation from Joel and Franck

status:

  • system underperforming: 2 degrees variation during a day
  • lack of monitoring: only the temperature is available
    • difficult to know what the system is doing
    • no monitoring of the fan status, pressure/flow, setting of the valve opening
  • poor remote cotrollability: only set temperature and door opening limits
  • lack of insulation for the doors
  • poor/degraded air tightness 

 

proposed improvements:

  • better insulation:
    • doors'insulation
    • air thightening foam replacement
  • adding extra monitoring:
    • better temperature probes
    • valve setting
    • input and output flow
    • fan rotation speed
  • adding extra controls:
    • fan switch
    • PID remote retraining
    • remote valve control
    • status dashboard

 

proposed plan of action:

  • cleaning of the heat exchanger in one point this YETS
  • cleaning of all heat exchangers in LS3
    • replacement in one point of the heat exchangers with a spare set
    • cleaning of the removed exchangers to become the new spares
    • repeat from start in another point
  • installation of a prototype system in this YETS
    • system to be place in parallel at first and 'passive'
    • the test system will be overequipped (superset of the monitoring)
    • switch to the new system after validation of the integration
    • definition of which sensors are relevant after few months of experience
  • installation of the new systems in LS3

 

Presentation from Enrique

  • ICS offers a full service for systems using PLC:
    • development
    • support for the system definition
    • maintenance and piquet
  • the proposed solution is fully integrated in the control system
  • for our systems they suggest a PLC per point
    • cost per point including all the sensor interfaces: 2kCHF
    • the sensors wiring is up to BI
    • the sensors are to be provided by BI
  • the development of the control SW is a 1 tantum of 62k including the suppoort and maintenance after

 

Discussion and actions:

  • the intervention is estimated to 4 hours per rack but with large uncertainties (better estimate after YETS)
    • replacement and cleaning of the exchanger
    • cabling of sensors
    • insulation
  • the cost per rack for sensors and insulation is estimated at less than 1k per rack
    • flowmeter and valves to be rediscussed with EN/CV <= action on Franck and Joel
  • the total cost per BA is estimated to ~8k: total material cost 64k
  • with the development cost, originally assumed on BI, we arrive to 130k 

 

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