200,000 psi Hydraulic pressure vessel wall thickness?

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SUMMARY

The discussion centers on the necessity of determining the appropriate wall thickness for a cylinder designed to withstand a working pressure of 200,000 psi, made from high-grade 4340 vacuum melt steel with an ultimate tensile strength of 260,000 psi. The original poster expressed uncertainty about using hoop stress calculators and whether they account for material properties. Forum participants emphasized the critical importance of consulting a professional engineer rather than relying on online calculators or forum advice for such high-stakes engineering tasks.

PREREQUISITES
  • Understanding of hoop stress calculations
  • Knowledge of material properties, specifically for 4340 vacuum melt steel
  • Familiarity with engineering standards for pressure vessels
  • Experience in consulting with professional engineers for high-pressure applications
NEXT STEPS
  • Research the ASME Boiler and Pressure Vessel Code for design standards
  • Learn about the mechanical properties of 4340 steel and its heat treatment processes
  • Explore advanced hoop stress calculation methods and software
  • Consult with a licensed professional engineer specializing in pressure vessel design
USEFUL FOR

Mechanical engineers, materials scientists, and anyone involved in the design and manufacturing of high-pressure vessels.

Andersonaz1965
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I'm Having a part machined with a cylinder shape approximately 14 inches in length with a cylinder hole in the center with a diameter of .930 . I have no idea how thick the cylinder wall needs to be. I have looked up and used hoop stress calculators online but I do not understand if they take into account the type of material that I am using. I will be using a high-grade 4340 vacuum melt steel. After the heat treating process is complete it will have a ultimate tensile strength of approximately 260,000 psi. I can get the material data sheet listed if that would help. This part needs to be able to withstand a 200,000 PSI working pressure. Any help or direction would be greatly appreciated. Thank you
 
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Andersonaz1965 said:
I'm Having a part machined with a cylinder shape approximately 14 inches in length with a cylinder hole in the center with a diameter of .930 . I have no idea how thick the cylinder wall needs to be. I have looked up and used hoop stress calculators online but I do not understand if they take into account the type of material that I am using. I will be using a high-grade 4340 vacuum melt steel. After the heat treating process is complete it will have a ultimate tensile strength of approximately 260,000 psi. I can get the material data sheet listed if that would help. This part needs to be able to withstand a 200,000 PSI working pressure. Any help or direction would be greatly appreciated. Thank you
If you have no idea how thick the wall needs to be on a cylinder which is supposed to withstand 200,000 psi, you are wasting your time and money having a piece machined. What happens if the wall is too thin? What do you do then?

You have no idea what you are doing. I urge you to stop immediately and consult a professional engineer to see if it is even feasible to make such a cylinder. This is something which should not be left to stress calculators on the web and asking questions on anonymous forums.
 
SteamKing said it all.

Thread closed.
 

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