LST Gas System

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LST Gas System

• R. Messner
• May 2004
• Readiness Review

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Will cover a few of the items below

• Gas Mix the issue of what gas mixtures will be
  allowed in the LST system has been resolved
• FHA ONeill, Budnick
• HEEC review
• Gas Mixing System
• In leak test
• Want to test output flows ASAP
• Integrate with the GIB
• Gas Interrupt Box (GIB)
• Finished with checkout
• Had found problems with firmware fixed
• IR-2 Distribution Panels
• Flow restrictor in hand, checked out
• Gas Supply Manifolds
• Next to be assembled

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Gas Mix Instead of getting a specific mix
approved, we want approval for a region of mixes
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Gas Mix The operating region takes into account
the stability we have seen in the RPC system
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Mixing System Functionality
A fourth mass flow meter can provide a
tie-breaking vote in case of MFM/MFC
disagreement Can also pick up small drifts in
mixed gas flows
Shut-off solenoids will close if the gas mix
drifts out of the allowed region
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Gas Rack - in leak test
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Gas Rack
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Gas Interrupt Box Functionality
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GIB in checkout
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Overview of the IR-2 Distribution
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Silica tubing flow resistor
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Check of silica tubing flow resistance
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Gas Shack Layout
Two new inert gas supplies Each will have a
shutoff valve, orifice, overpressure releases
Construct a new isobutane supply rack and
manifold Will have two isobutane shutoff valves,
orifice
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Summary

• The loose ends involved in determining a
  permissible gas mix have been resolved
• Very close to having a functional mixing system
  with its monitor system to ensure a non-flammable
  and a runnable mix
• Use air or nitrogen, check the self consistency
  and stability of system
• It is important to keep moving ahead sufficient
  and timely technical support is critical
• Want the gas rack in the gas shack before the end
  of May
• Delayed a bit because we want to get the
  manifolds done first then we can do more things
  in parallel
• Expansion of Gas Shack safety system in progress
• EPICs monitor system will be the next item to
  attack

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Spare Slides
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Looked at the recent performance of the RPC
system
Snapshots taken a week apart, a half day at a
time This is a measure of the stability of the
gas mixture
- 0.0005 out of 0.045 Or 1.0 of the
reading
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Recent performance of the RPC system
Isobutane Fraction in Gas Mixture