Distinguishing between elliptical & torrispherical domes

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SUMMARY

This discussion focuses on distinguishing between elliptical and torrispherical domes in pressure vessels through visual inspection and basic measuring techniques. A torrispherical dome features a tighter radius of curvature around the shoulder, while an elliptical dome exhibits a gentler curvature. Participants recommend creating a curvature gauge using three screws aligned in a straight line to measure the dome's surface accurately. The upper section of a torrispherical dome maintains constant curvature, contrasting with the varying curvature of an elliptical dome.

PREREQUISITES
  • Understanding of pressure vessel design principles
  • Familiarity with curvature measurement techniques
  • Knowledge of dome geometries
  • Basic skills in using hand tools for measurement
NEXT STEPS
  • Research how to create and use a curvature gauge for dome measurements
  • Study the ASME code for pressure vessel design and head types
  • Learn about the mechanical properties of different dome shapes
  • Explore visual inspection techniques for pressure vessel integrity
USEFUL FOR

Engineers, pressure vessel designers, and quality control inspectors involved in the manufacturing and inspection of pressure vessels will benefit from this discussion.

guideonl
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Hi everyone,
How to determine if a pressure vessel dome is eliptical or torrispherical (from external view on a complete pressure vessel, visually/basic measuring).
Thank you.
 
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A torrispherical dome will have a tighter radius of curvature around the shoulder.
The elliptical dome will have a more gentle change as the side is tangent with the ellipse.
Make yourself a curvature gauge by placing three screws in a straight line. Adjust the screws so all three contact the surface of the dome. The upper part of a torrispherical dome is spherical, so will have a constant curvature. An elliptical dome will have a varying curvature.
 
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Very interesting thread, thanks guys. I've learned something new! :smile:
 
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Baluncore said:
Make yourself a curvature gauge by placing three screws in a straight line. Adjust the screws so all three contact the surface of the dome. The upper part of a torrispherical dome is spherical, so will have a constant curvature. An elliptical dome will have a varying curvature.
What Baluncore says is certainly true, but it must be done with care. The constant curvature is only on the spherical portion. If the gauge is too large, it may not be possible to avoid getting onto the elliptical skirt.
 
Dr.D said:
If the gauge is too large, it may not be possible to avoid getting onto the elliptical skirt.
What elliptical skirt, on which head profile ?
 
My bad, I was thinking of another configuration.
 
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Thank you Baluncore & Lnewqban for the information and ideas.
 
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