mice hydrogen control system mice safety review meeting 4 th oct 2011 pj warburton - daresbury lab
TRANSCRIPT
![Page 1: MICE Hydrogen Control System MICE Safety Review Meeting 4 th Oct 2011 PJ Warburton - Daresbury Lab](https://reader035.vdocuments.site/reader035/viewer/2022062722/56649f345503460f94c52471/html5/thumbnails/1.jpg)
MICE Hydrogen Control System
MICE Safety Review Meeting4th Oct 2011PJ Warburton - Daresbury Lab
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Control System Functions• Operate Valves• Monitor - Temp Pressure, Flow &
Vacuum• Control - Vac Pumps, Heater Chiller &
Cryo-Cooler• Run Control Sequences• Gas Detection System• Extract System• UPS
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Control System Functions
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Control PLC• Omron CJ1M Modular PLC with
Ethernet• Existing Software for Link to EPICS• NS8 Programmable Terminal (HMI),
8.4 inch Touch Screen with Ethernet• Data logging & trending• Key Switches on Selected Functions
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Control System
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Control System• Valve air solenoids mounted on the outside
of the Gas Panel Enclosure• Valve limit switches are intrinsically safe and
can detect short circuits and broken wires, • Pressure transducers are 4-20mA giving
broken wire detection.• The PLC provides start / stop signals to
pumps; manual control is also available.Note:- PLC status does not affect pump operation i.e. the pumps do not go off if the PLC does.
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Control System
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Hydrogen Control Room Layout
• 4 Control Cabinets 1 per System plus Detection & Extraction
•UPS
•Distribution
•Vac Pump Contactor Panel
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Intrinsic Safety (Ex i)• Limit energy in electrical circuits to
less then the value required to ignite Hydrogen(20 micro J @ 25%)
• All Circuits in the Gas Panel• Temp & Level sensors in Cryostat• Cryostat Heaters are protected by
pressure interlock (SIL Rated)
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Gas Detection System• Oliver Tocsin 920• All Detectors and Beacons paired on
separate bus loops• Alarm at 50% LEL• Linked to Extraction System to
increase speed on detection of leak• Annual Testing / Maintenance by
contractor
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Extraction System• Two Inverter controlled 7.5kW Fans
mounted on the roof • One fan on its own can providing the
flow rate required to deal with a leak.(DSEAR rec = 450 air changes per hour).
• Differential Pressure Sw & Inverter Current feedback to prove operation
• Normal running at 100 ACH with increased speed on detection of leak
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UPS• 2 Hour UPS back up of Fans & Control
System PLC, Heaters, Vac Gauges etc• 50 min to boil off LH2 In Cryostat• Annual Testing / Maintenance by
contractor
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Safety Functions (Non SIL)
• Operation Of The Ventilation System On Detection Of A Hydrogen Leak – Hardwired
• Shut PV20 If There Is Pressure Rise In The Cryostat During Operation
• Cryo Vacuum let up to boil off gas if heaters fail / can not be used
• Permit Key issued when Gas Panel Enclosure is complete i.e. All panels fitted to Prevent Access When Hydrogen Present
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Other Control Functions
• A Shut-off Facility For The Hydride Bed Heater/Chiller On Detection Of Bed Overpressure
• Cryocooler Shut-off If Temperature Drops Below Hydrogen Freezing Point (14k) or Heaters Faulty
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Control Sequences• Helium Purge • Cryostat Vacuum• Helium Fill• Helium Empty• H2 Line Purge• Hydrogen Fill• Hydrogen Empty• Diagnostic / Test
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Questions