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

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Presentation transcript:

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 Extract System UPS

Control System Functions

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

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.

Control System

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

Intrinsic Safety (Ex i) Limit energy in electrical circuits to less then the value required to ignite Hydrogen (20 micro 25%) All Circuits in the Gas Panel Temp & Level sensors in Cryostat Cryostat Heaters are protected by pressure interlock (SIL Rated)

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

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

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

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

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

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

Questions