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Matthew Hills
Hydrogen System – Piping and Instrumentation
Diagram
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Matthew Hills
Hydrogen System P&ID
Cryostat
HeliumStore
Gas Panel
Venting
Vac. Pumps
Heater/ChillerUnit
HydrogenBottle
H
H H
H
H
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Matthew Hills
Line Types and Colour Coding
Note: This scheme is based on operating the system with Hydrogen rather than Helium.
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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.
H
H H
H
H
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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
H
H H
H
H
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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
H
H H
H
H
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Matthew Hills
Gas Panel and Hood
Hydride BedBuffer Volume
Extraction Hood
Absorber ReliefValves
Cryostat Relief Valves
Fill/Purge Valves
H
H H
H
H
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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
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Matthew Hills
Fill/Purge Valves
• Pneumatically actuated valves• Arrow indicates position on failure
H
H H
H
H
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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
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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
H
H H
H
H
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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 SensorsPressure Transducers
Temperature sensors
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Matthew Hills
Cryostat
H
H H
H
H
Cryocooler
Compressor
Level Sensors
Helium Jacketingon Pipes
Electrical heating ofbase plate
Pre-cooling loops
Pressure Transducers
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Matthew Hills
Vacuum System
2 Elements
• Purging Pump for H2 system
• Cryostat Vacuum
H
H H
HH
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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
TRIVACD25BCS
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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
H
H H
H
H
Whessoe – Varec Flame Arrestor
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Matthew Hills
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