1. Matthew Hills Hydrogen System – Piping and Instrumentation Diagram

2. Matthew Hills Hydrogen System P&ID Cryostat Helium Store Gas Panel Venting Vac. Pumps Heater/ Chiller Unit Hydrogen Bottle

3. Matthew Hills Line Types and Colour Coding Note: This scheme is based on operating the system with Hydrogen rather than Helium.

4. Matthew Hills Nomenclature HA prefix used throughout to indicate Hydrogen System A Pipelines –G or L prefix indicates whether line will contain gas or liquid during normal operation with cryo- cooler running. –Pipe size specified according to I.D. or DN standard.

5. Matthew Hills Nomenclature (2) Valves –All uniquely numbered PV – Pneumatic Valve CV – Control Valve HV – Hand Valve BD – Bursting Disc RV – Relief Valve –Sized by DN standard –Set pressure shown for relief valves

6. Matthew Hills Nomenclature (3) Instrumentation –PG/VG – Pressure/Vacuum Gauge –LS – Level Sensor –TS – Temperature Sensor –HD – Hydrogen Detector –FM – Flow Meter VP - Vacuum Pump

7. Matthew Hills Gas Panel and Hood Hydride Bed Buffer Volume Extraction Hood Absorber Relief Valves Cryostat Relief Valves Fill/Purge Valves

8. Matthew Hills Hydride Bed Supplier: TREIBACHER INDUSTRIE AG –The nominal figures for the absorption temperature is -10°C and +20°C for the evolution temperature. Heat Transfer Medium - Water / glycolMH Weight: 120 kg Tank Structure A hull with 7 inter-connected stainless-steel storage cylinders, each with internal coil for cooling/heating. Dimensions Ø370 mm × L1500 mm (not including attachments), horizontal position Tank Total Weight 260-280 kg Operating Conditions: –Charging Gas Component Hydrogen of 99.99% purity –Charging Gas Pressure 1.2-1.7 bar abs –Hydrogen Charging Rate Max 70 NL/min –Discharging Gas Pressure 1.0-7.0 bar abs

9. Matthew Hills Fill/Purge Valves Pneumatically actuated valves Arrow indicates position on failure

10. Matthew Hills Valve Types Ball Valves –Pneumatically actuated –Spring Return Actuators ensure valve returns to default position on failure Control Valves –Pneumatically Actuated –Large range on throttling –Suitable for use with hydrogen

11. Matthew Hills Relief Valves Tyco (AG Series 90) Relief Valves –Pilot valves – quick acting –3% tolerance on set pressure –Closes at 95% of set pressure –Response time is <0.5s BS&B Low Pressure Reverse Buckling Disc –±5% tolerance on burst pressure –Vacuum/back pressure resistant Hand Valves can be locked off as necessary

12. Matthew Hills Instrumentation Temperature Sensors –Platinum Resistance –Fast response time (<0.5s) Level Sensors –AMI Capacitance Level Transmitter –Useable with Hydrogen Pressure and Vacuum Gauges –Leybold can supply capacitance vacuum gauges, which are safe for use with hydrogen. –Explosion proof pressure transducers available from Honeywell Level Sensors Pressure Transducers Temperature sensors

13. Matthew Hills Cryostat Cryocooler Compressor Level Sensors Helium Jacketing on Pipes Electrical heating of base plate Pre-cooling loops Pressure Transducers

14. Matthew Hills Vacuum System 2 Elements Purging Pump for H2 system Cryostat Vacuum

15. Matthew Hills Vacuum System Proposal received from Leybold based on combination of rotary vane and turbo-molecular pumps –TRIVAC D40B for hydrogen system purging pump (VP1) –Special Pumpset with active control suggested for cryostat vacuum (VP2) D25BCS backing pump Turbo-molecular TMP151C to achieve high vacuum (10 -3 mbar) Both pumps can be operated with purge gas (e.g. He) if pressure rises (indicating a leak) TRIVAC D40B TMP151C TRIVAC D25BCS

16. Matthew Hills Venting Hydrogen detectors in extraction hood, vent line and vacuum exhaust 2 fans provide redundancy in venting from hood Flame arrestors used throughout Helium flow in vent line to dilute leaks Whessoe – Varec Flame Arrestor

17. Matthew Hills END