Designing Pressure Vessel for Heating Air to 500 C

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Discussion Overview

The discussion revolves around the design of a cylindrical pressure vessel intended to heat air to temperatures of approximately 500°C (773 K) at a pressure of around 2.5 bars. Participants explore material selection, thermal considerations, and relevant safety codes for constructing such a vessel, with a specified volume of about 1 liter.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant expresses uncertainty about material selection and thermal factors for heating air in a closed vessel.
  • Another participant recommends using the ASME Section VIII Boiler & Pressure Vessel Code for wall thickness formulas and allowable stresses at different temperatures.
  • A different viewpoint suggests that in the US, a vessel with an internal diameter of less than 6 inches may not require compliance with the ASME BPV Code, but emphasizes that using the code is still the proper approach.
  • Participants inquire about the context of the project, questioning whether it is for a school assignment or an actual design.

Areas of Agreement / Disagreement

There is no consensus on the specific materials to use or the necessity of adhering to safety codes, as participants present differing views on the applicability of the ASME BPV Code based on vessel size and location.

Contextual Notes

Participants have not resolved the implications of different safety codes in various countries, nor have they clarified the specific thermal factors that need to be considered for the heating process.

Who May Find This Useful

Individuals interested in pressure vessel design, material science, and engineering safety codes may find this discussion relevant.

RKD89
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Hi Guys
I need to design a Cylindrical vessel, in which Air is to be heated from the bottom upto temperatures as high as about 500 C( 773 K)
Since it s a closed vessel , the pressure will reach around 2.5bars.
The volume of the vessel should be something around 1 litre.

I know how to design simple "thin" and "thick" cylinders.
Since the pressure is not too large, I don't think it would be that difficult.

My Problem is I have no clue what material to Use and what thermal factors to consider for the Heating.



If somebody could point me to the right direction, suggestion some book , or reference, it will be appreciated.


PS: Is it that difficult, will it take lot of time?
Do I need to go through safety codes (as in a boiler)
 
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The best approach is to use ASME Section VIII Boiler & Pressure Vessel Code. It has all the wall thickness formulas and allowable stresses for materials at different temperatures.

If you do not have access to this code, try to find "Pressure Vessel Handbook"

This calculation is fairly straighforward, once you have all the information in front of you.

Is this for a school project or actual design?
 
In the US, the vessel could probably be made from a relatively small pipe (less than 6" ID) such that it avoids falling under the scope of the ASME BPV. Still, the proper way to do the design in the US is to use the ASME BPV Code regardless of whether or not it gets stamped. If it's larger than 6" ID, by law it has to be a coded vessel which means it has to be designed, built and stamped as an ASME vessel by a certified manufacturer.

I don't know exactly what codes apply in other countries around the world. You should specify what country this is going to be built and used in so someone with the right knowledge of that country's laws can help out.
 
edgepflow said:
The best approach is to use ASME Section VIII Boiler & Pressure Vessel Code. It has all the wall thickness formulas and allowable stresses for materials at different temperatures.

If you do not have access to this code, try to find "Pressure Vessel Handbook"

This calculation is fairly straighforward, once you have all the information in front of you.

Is this for a school project or actual design?


It is more like a project.

thnx for the reference
 

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