GlueX Target Design Mtg, June 21, 2013
From GlueXWiki
Present: Dave Meekins, Jim Fochtman, Mark Ito, Josh Pierce, Tim Whitlatch,
Agenda
- Review notes from last mtg
- Fabrication/testing update
- Design update
- Controls update
- Gas panel update
Info
- P&I Diagram Media:Target P&I.pdf
- Controls logic Media:Target controls.pdf
- Dave's SOW Media:Target new SOW.pdf
- Dave's Calcs Media:Target calcs1.pdf Media:Target calcs2.pdf
- Dave's FMEA Media:Target latest FMEA.pdf
Notes from last week
- Discussed Gas system status, vacuum system, cell and scattering chamber and tasks to be done. The following are the results of the discussion;
- Procurement of gas system components started. Still need piping and relief valves. $40-50K, some components have arrived
- Chris suggested buying a spare refrig.
- Most gas panel components bought - Waiting on cart interface from Jim F.
- Chris modified P&I he ordered a pressure switch for target sub atmoshere - if too cold, it will trip compressor.
- Still working on size of gas tank, will determine if minimum liquid can be used during horizontal testing
- Jim/James/Josh to meet May 24 to discuss shielding and fill vent lines for production target
- Will use oring to seal scattering chamber (alum dummy to be used for test
- Some drawings are to be given to target group for fab. Need to decide which ones.
- Floyd will work with Jim on Cryo lines.
- Need to decide what goes on FSD - CCGs need to be shut off if Hydrogen leak, gate valve at pump needs to close.
- Readiness review will be in Fall some time (after more testing and fab)
- Lakeshore controller needs to be on UPS - compressor will shut off if power outage
- Dave/Chris to write "what if" dialog of FMEA
- James is making a new alum target base and will send Jim 3D model
- Mark to verify alum ok from physics standpoint
- Need to release drawings as they are made
- Sizing tank based on min liquid volume possible
- May put valve on tank to purge to vent system. Stack must be 5' above roof. Jim to work with facilities
- Target to have 1 fill and 1 return line. "kink in return to reduce liquid volume
- Build production configuration to test system with horizontal target
- Plan to use 20' x 1.5 inch flex line to allow target to be moved in and out of the detector
- lakeshore boxes from target group are in. PLC controls ordered and some have arrived. Dave to order remaining controls/cables.
- Looks like a heat exchanger using LCW/Chilled water most economical for refrig. compressor. Jim working this
- Jim to get with Chris and James on scattering chamber design (some ideas in work) (<15Psig). Jim has envelope
- Tim ordered vacuum system pump cube (Pfeifer turbo cube). Still need to order gauging.
- Chris sent out list of all items needed for monitoring/controlling from PLC system
- Hall D people to discuss what needs to be shut off in hall when target vacuum goes south
- Jim to develop H2 vent details
- Insertion cart can be extended upstream 18-24" to get panel and turbo in lower mag field. Jim to finalize design with target group.
- One target cell is made, will need to make two more. Joint in cell to be at 12 oclock. Also, make an aluminum base with 2 line design to test.
- Jim to work with Josh/James on the design of the shield and plumbing
- Chris working on PLC algorithm and "empty target/fill target" procedure.
- FMEA needed. Cannot rely on PLC for personnel safety. Use safety pressure switches to turn off/close vacuum valves, power to compressor and heater.
- Pressurization to failure has been done on individual components. Dave does not believe we need to do the entire system to failure. 2nd DA agreement needed.
- Heater on return line had little effect on enhancing convection - not needed
- need heater on supply line to boil off liquid. It took 3 days to boil off neon from cell.
- If heaters used, need controls
- Plan on internal review this July
- Question came up if UPS power is required for any components. Maybe not if relays shut off compressor if power goes out.
- need to review interlocks on P&I
- Dave to update SOW
