Hydrogen Delivery System

1
Hydrogen Delivery System RD Activities

• T W Bradshaw
• M Courthold
• M Hills
• J Rochford
• Daresbury Controls Group etc

2
AS Scientific status
Cryostat vesselNow complete
3
AS Scientific status
CryostatCondenser and condensing pot complete
4
AS Scientific status
Cryostat Following AFC design change,mods
underway to 1st stage thermal cooling
5
Plans Schedule

• Ongoing issues with commissioning the Decay
  Solenoid and Linde refrigerator are still taking
  effort away from this project (MJDC, JHR, MJH)
• H2 RD team at RAL still chronically
  short-staffed, but recruitment of two additional
  team members has now been approved by STFC.
• Ian Mullacrane (DL) coordinating DL effort re
  controls instrumentation, which need to comply
  with IEC 61508/61511 (Functional Safety). Key
  members of RAL DL teams now trained in Safety
  Integrity Level (SIL) assessment and are now
  assessing SIL level of H2 RD system prior to
  forthcoming safety review. Consultants will still
  needed to formally assess system, to ensure
  compliance with IEC 61508/61511.
• Work on cryostat build at AS Scientific now
  proceeding more satisfactorily. Final decisions
  re instrumentation control hardware for Gas
  Panel have been taken, and purchasing now
  underway. The choice of LH2 level detectors is
  being revisited, following the discovery that AMI
  now has a UK office and ought now to be able to
  ATEX certify the sensors.

6
Plans Schedule

• Design of H2 ventilation system and external pump
  housing complete, and tender action underway.
  There is an issue re explosion-proofing the
  ventilation system, which is still to be
  resolved. Mound excavation complete.
• Hydrogen System Control Room has been assigned.
• H2 system purging pump, along with backing-pump
  for cryostat pumping rig, will be housed outside
  MICE Hall. The design of the enclosure is in
  progress.
• Exact location of turbo-pump for the RD cryostat
  pumping rig still to be decided. It needs to be
  located outside magnetic shielding wall, but its
  location might differ from that of final system,
  and it is important not to cut more holes in
  shielding wall than absolutely necessary.
• Initial tests will be conducted with Helium in
  Cryogenics Laboratory, to avoid interference with
  installation of ventilation system

7
Ventilation Vacuum Systems
MICE Hall South Wall
8
Hall Installation
9
Plans Schedule

• Schedule has been revised
• It is anticipated that the ventilation system in
  the hall will be installed by the end of March.
• It is planned to submit H2 RD commissioning plan
  to ISIS/MICE Safety Committee in February.
• A MICE/ISIS Safety Review will be held as soon as
  practical in the near future, hopefully Feb/Mar,
  at which the next steps towards a final Safety
  Review will be decided.

10
Testing
Helium Tests Check instrumentation Pump and
purge Check relief valve settings and
operation Check cryocooler operation at LH2 and
LHe temperatures Liquify helium in the
cryostat Test emptying sequence Thermally cycle
the system, to check for leaks from thermal
stresses Hydrogen Tests Check alarms and
interlocks Liquify hydrogen in the cryostat Check
empty and purge sequence Test effect of using
Helium top-up gas to maintain positive
pressure Measure H2 desorption rate Measure H2
absorption rate
11
Instrumentation update

• Temperature Sensors
• Platinum Resistance
• Fast response time (lt0.5s)
• Cernox for cooler cold head temp.
• Level Sensors
• AMI Capacitance Level Transmitter
• Useable with Hydrogen
• Problem with obtaining ATEX certification, but
  there is now an AMI UK office, so a solution
  should now be possible
• Pressure and Vacuum Gauges
• Leybold can supply capacitance vacuum gauges,
  which are safe for use with hydrogen.
• Explosion proof pressure transducers available
  from Honeywell
• ATEX approved pressure transducers also available
  from SensorsOne

Temperature sensors
Pressure Transducers
Level Sensors