Overview of TWI’s High Pressure
Transcript of Overview of TWI’s High Pressure
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Overview of TWI’s High Pressure
Hydrogen Testing Facility
2 day informational meeting
Sandia National Llaboratories
9 & 10 April 2013
Richard Pargeter & Chris Miller
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Summary
• 2 dedicated vessels allow a variety of
mechanical tests to be performed in high
purity hydrogen gas at pressures up to
1000bar (14500psi)
• Testing can be conducted at elevated and
sub-zero temperatures
• Facility for pre-charging specimens with
hydrogen prior to testing
• Supporting, eg analytical, facilities.
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450bar test vessel
• Atmospheric pressure to 450bar (6500psi)
• Ambient temperature to 100°C
– Heaters embedded in vessel wall
• Maximum tensile load: 100kN
• Maximum compressive load: 50kN
– (no pressure balance)
• Cyclic loading up to a maximum frequency
of 5Hz.
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450bar Vessel
Locking
bolts
Pressure
gauge
External
load cell
Test
chamber
Vessel door
Servo-hydraulic
test machine
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450bar Vessel
Internal load
cell
3-point bend
loading jig
DCPD
measurement
DC current
supply
Gas seals
SENB
specimen
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1000bar vesel
• Atmospheric pressure to 1000bar
(14500psi)
– (seals not so good at low pressure)
• 85°C to -50°C
– Local specimen heating/cooling
• Maximum tensile and compressive load:
100kN (dynamically balanced)
• Cyclic loading up to a maximum frequency
of 5Hz.
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1000bar Vessel - open
Internal load
cell
Lantern ring
Tensile
specimen
Cooling coil
External load cell
Locking
rods
Gas seal
External
vessel
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-50°C tensile arrangement
Extensometer
Cooling block
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1000bar Vessel - closed
Locking
rods
External
heat tracing
Pressure
gauge
Blast door
interlocks
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Space fillers, 450bar
Removable
handles
Half block
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Space fillers, 1000bar
From back
Front half
shell
Both half
shells
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Control
• PID control – one button initiates full
purge sequence
• Pneumatic valves.
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Pre-test sequence
• Specimen loaded into vessel
• Vessel & test cell closed and locked
• Nitrogen purges (3): 10 bar
• Hydrogen purges (8): 10 bar
• Quick fill to bottle pressure
• Booster on, pressurising the vessel
to test pressure
• Heating/cooling equilibriation
• Test initiated.
PID
controlled
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Gas Supply
• 99.9999% purity Hydrogen
supplied in banks of 12
• Solenoid valves
• (Other gasses possible -
99.9999% purity He has been
used)
• Oxygen-free Nitrogen used for
purging
• Liquid nitrogen for cooling
• Air compressor for pneumatic
valves.
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Gas Booster
• Boosts bottle
pressure
(typically 200bar
when full) to a
maximum of
1000bar
• Minimum bottle
pressure of
40bar required
for effective
operation.
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Under great pressure
Under great pressure - TWI's Hydrogen test
facility - YouTube
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Hydrogen Pre-charging
• Specimens exposed to high purity
hydrogen at up to 100bar (1450psi)
pressure and up to 500°C
• Used for Hastelloy 230, Alloy 783, Alloy
718, A286…
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Hydrogen Pre-charging
Split-tube furnace
Alloy 625 vessel body
Cooled gas vent
Gas supply
Sealing flange
Thermocouple wire
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Testing Conducted To-Date
• Tensile testing of round specimens
• Tensile testing of flat specimens
• Tensile testing of notched round
specimens
• Fatigue endurance testing of notched
round and flat tensile specimens
• Fracture toughness and fatigue crack
growth rate (FCGR) testing of single edge
notch bend (SENB) and surface notch
tension specimens.
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Tensile Specimens
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SENB Specimen in 3-point Bend
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Future Development
• Development of tooling to accept a wider
range of specimen geometries; e.g.
compact tension specimens
• Development of technique for post-test
sampling and compositional analysis of
test gas.
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Some issues
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1000bar Initial lantern ring load cell trials
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Lo
ad
, kN
Displacement, mm
Internal lantern ring
External load cell
Karma strain gauge
Normal strain gauge
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He (green) and H2, 400bar, -50°C
Extension, mm
20
0
Load,
kN
0 20
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Current internal load cell
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Lo
ad
, kN
Displacement, mm
5 hours
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O-ring seal failure
• Post hot test (on decompression)
• Test not compromised
• Seals a consumable item.
450bar door seal
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Seal spring failure
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Thank you for your attention
Any questions?