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D0 Silicon Upgrade: Liquid Nitrogen Valve Sizing for D-Zero Upgrade

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Description

There were 5 control valves and 2 manual valves for the liquid nitrogen distribution system that needed to be sized and procured for the upgrade. This engineering note documents the calculations done to properly size these valves. A table summarizes the valve choices. The raw calculations are attached as an appendix. The calculations jump around a bit. No effort was made to re-organize or rewrite them for the reader. The sizing calcs. on Pages 1 through 4 were first pass calcs. based on pure liquid to the valves with no attention to flashing/choking. The calcs on pages 5 through 8 ... continued below

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19 pages

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Rucinski, Russ September 13, 1995.

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Description

There were 5 control valves and 2 manual valves for the liquid nitrogen distribution system that needed to be sized and procured for the upgrade. This engineering note documents the calculations done to properly size these valves. A table summarizes the valve choices. The raw calculations are attached as an appendix. The calculations jump around a bit. No effort was made to re-organize or rewrite them for the reader. The sizing calcs. on Pages 1 through 4 were first pass calcs. based on pure liquid to the valves with no attention to flashing/choking. The calcs on pages 5 through 8 then refine the calculations by considering the LN2 to the valve inlets to be two phase with quality of 0.032. This is a real situation if the LN2 subcooler is out of service for use as a He cooldown heat exchanger. Also, flashing would occur for this situation and is taken into account. The end result of this refinement pushed the Cv values up by about a factor of 3 over the initial calcs. of pages 1 through 4. The results of the refined (correct) calculations pages 5 through 8 appear in the table above. The required operating Cv's are smaller than commercially available LN2 control valves. Therefore it has been decided to use Fermilab Saver type control valve assemblies with the valve bullet Cv1s listed above. The bullets are 100: 1 equal percentage types and provide better control at the lower percentage of valve Cv values. See flow characteristic data and curve for these valves in appendix B. The manual valves will be commercially purchased, probably a Cryolab model CV3-84-5WPG2 or CV8-84-5WPG2 or CVI model V-1060-050-VJ. Pages 8-10 calculate a minimum required cooldown flowrate as referenced in Cryogenic Systems by Barron. This was done to be sure the valves and piping system did not choke the warm flow so much that cooldown could not be achieved. The minimum mass flow rate needed for a simultaneous, serial cooldown of the refrigerator, solenoid and VLPC system was 6.4 g/s. This warm flow would get choked by an opening less than 0.175-inch in diameter. A valve with only 10 psi differential across it with this flowrate would need to be Cv=0.85. These numbers show that cooldown will be achievable. Firstly, the flow through these components is not serial. The flows get split and sent to vent separately. Secondly, the valves are located upstream of the heat load. And lastly, the Cv of the valves are larger than 0.85 except for the solenoid which has a very low heat load/small flow split and the VLPC's. The VLPC flow split brings the minimal required Cv for a valve situated at the warm outlet of the LN2 circuit to be 0.26. I foresee no, problems cooling down the LN2 components.

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19 pages

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  • Report No.: FERMILAB-D0-EN-430
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/1033301 | External Link
  • Office of Scientific & Technical Information Report Number: 1033301
  • Archival Resource Key: ark:/67531/metadc837993

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • September 13, 1995

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

Description Last Updated

  • Aug. 30, 2016, 4:09 p.m.

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Rucinski, Russ. D0 Silicon Upgrade: Liquid Nitrogen Valve Sizing for D-Zero Upgrade, report, September 13, 1995; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc837993/: accessed January 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.