D0 Silicon Upgrade: ASME Code and Pressure Calculations for Liquid Nitrogen Subcooler

Technical Report · Wed Oct 04 00:00:00 EDT 1995

DOI:https://doi.org/10.2172/1033296· OSTI ID:1033296

Kuwazaki, Andrew ^[1]; Leicht, Todd ^[1]

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1. Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Included in this engineering note are three separate calculation divisions. The first calculations are the determination of the required thickness of the LN₂ subcooler flat head according to ASME code. This section includes Appendix A-C. The minimum plate thickness determined was 0.563 in. The actual thickness chosen in fabrication was a 3/4-inch plate milled to 0.594-inch at the bolt circle. Along with the plate thickness, this section calculates the required reinforcement area at the top plate penetrations. It was found that a 1/4-inch fillet weld at each penetration was adequate. The next set of calculations were done to prove that the subcooler internal pressure will always be less than 15 psig and therefore will not be classified as a pressure vessel. The subcooler is always open to a vent pipe. Appendix D calculations show that the vent pipe has a capacity of 1042 lbs/hr if 15 psig is present at the subcooler. It goes on to show that the inlet piping would at that flow rate, see a pressure drop of 104 psig. The maximum supply pressure of the LN₂ storage dewar is 50 psig. Appendix E addresses required flow rates for steady state, loss of vacuum, or fire conditions. Page E9 shows a summary which states the maximum pressure would be 1.50 psig at fire conditions and internal pressure.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1033296
• Report Number(s): FERMILAB-D0-EN--435
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
AVAILABILITY
CAPACITY
DEWARS
Experiment-HEP
FABRICATION
FASTENERS
FERMILAB TEVATRON
FLOW RATE
NITROGEN
PLATES
PRESSURE DROP
PRESSURE VESSELS
SILICON
STORAGE
THICKNESS