D-Zero End Cap Calorimeter Annular Piping Analysis
In accoradnce with the ASME Code for Pressure Piping, B31 version of Chemical Plant and Petroleum Refinery Piping, ANSI/ASME B31.3-1984 Edition, the maximum allowable stress for 304 stainless steel piping is 25,500 psi. This 'Allowable Displacement Stress Range' value was calculated using equation (1a) found on page 16 of the above mentioned reference. Each of the lines that comprise the End Cap Calorimeter (BC) piping were modeled on ANSYS and the appropriate constraints were applied. This was done using the Piping Stress Analysis Module of ANSYS. The bending stresses and displacements due to the thermal contraction that occurs in cooling the piping from 300 K to 77 K were calculated by ANSYS. The seven lines involved and their maximum bending stresses are as follows: (1) Rupture Disc - Maximum bending stress is 8335 psi; (2) Argon Relief - Maximum bending stress is 12,619 psi; (3) Gaseous Argon Supply - Maximum bending stress is 5399 psi; (4) Liquid Nitrogen Cooldown Supply - Maximum bending stress is 7049 psi; (5) Liquid Nitrogen Operating Supply - Maximum bending stress is 5774 psi; (6) Nitrogen Exhaust - Maximum bending stress is 1826 psi; and (7) Argon/Nitrogen Vent - Maximum bending stress is 48,364 psi. The maximum bending stress values and their positions are indicated on the attached diagrams. The dashed line indicates the original position of the piping, and the solid line shows the position of the displaced piping. Also attached are copies of the programs used to model the piping configurations. The original analysis was done by J. Wendlandt, but later changes and additions required that the programs be modified and re-run. The maximum bending stress found in each line of the annular piping fell sufficiently below the allowed maximum of 25,500 psi. The maximum bending stress for the Argon/Nitrogen Vent line was 48,364 psi, which is greater than the value of 25,500 psi allowed by the code. This line of piping is located on the outside of the annular space and will be installed at Fermilab. While fabrication of the EC vessel is underway, modifications will be made to the Argon/Nitrogen Vent line in order that its stress values remain within that allowed by the code. The complete Argon/Nitrogen Vent line is analyzed in EN-312, D0 Cryogenic Piping Frame Stress Analysis, and the stresses are below the maximum allowable stress of 25,500 psi.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1031177
- Report Number(s):
- FERMILAB-D0-EN-175; TRN: US201201%%663
- Country of Publication:
- United States
- Language:
- English
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