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

## Abstract

Included in this engineering note are three separate calculation divisions. The first calculations are the determination of the required thickness of the LN{sub 2} 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 LN{sub 2} storage dewar is 50 psig. Appendix E addresses required flow rates for steady state, loss of vacuum, ormore »

- Authors:

- Publication Date:

- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

- Sponsoring Org.:
- USDOE Office of Science (SC)

- OSTI Identifier:
- 1033296

- Report Number(s):
- FERMILAB-D0-EN-435

TRN: US1200373

- DOE Contract Number:
- AC02-07CH11359

- Resource Type:
- Technical Report

- Country of Publication:
- United States

- Language:
- English

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

### Citation Formats

```
Kuwazaki, Andrew, Leicht, Todd, and /Fermilab.
```*D0 Silicon Upgrade: ASME Code and Pressure Calculations for Liquid Nitrogen Subcooler*. United States: N. p., 1995.
Web. doi:10.2172/1033296.

```
Kuwazaki, Andrew, Leicht, Todd, & /Fermilab.
```*D0 Silicon Upgrade: ASME Code and Pressure Calculations for Liquid Nitrogen Subcooler*. United States. https://doi.org/10.2172/1033296

```
Kuwazaki, Andrew, Leicht, Todd, and /Fermilab. Wed .
"D0 Silicon Upgrade: ASME Code and Pressure Calculations for Liquid Nitrogen Subcooler". United States. https://doi.org/10.2172/1033296. https://www.osti.gov/servlets/purl/1033296.
```

```
@article{osti_1033296,
```

title = {D0 Silicon Upgrade: ASME Code and Pressure Calculations for Liquid Nitrogen Subcooler},

author = {Kuwazaki, Andrew and Leicht, Todd and /Fermilab},

abstractNote = {Included in this engineering note are three separate calculation divisions. The first calculations are the determination of the required thickness of the LN{sub 2} 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 LN{sub 2} 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.},

doi = {10.2172/1033296},

url = {https://www.osti.gov/biblio/1033296},
journal = {},

number = ,

volume = ,

place = {United States},

year = {1995},

month = {10}

}