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MICE Hydrogen Control System

MICE Hydrogen Control System. MICE Safety Review Meeting 4 th Oct 2011 PJ Warburton - Daresbury Lab. Control System Functions. Operate Valves Monitor - Temp Pressure, Flow & Vacuum Control - Vac Pumps, Heater Chiller & Cryo-Cooler Run Control Sequences Gas Detection System

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MICE Hydrogen Control System

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  1. MICE Hydrogen Control System MICE Safety Review Meeting 4th Oct 2011 PJ Warburton - Daresbury Lab

  2. 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

  3. Control System Functions

  4. 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

  5. Control System

  6. 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.

  7. Control System

  8. Hydrogen Control Room Layout • 4 Control Cabinets 1 per System plus Detection & Extraction • UPS • Distribution • Vac Pump Contactor Panel

  9. 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)

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

  15. Control Sequences • Helium Purge • Cryostat Vacuum • Helium Fill • Helium Empty • H2 Line Purge • Hydrogen Fill • Hydrogen Empty • Diagnostic / Test

  16. Questions

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