Thinning amount of spherical head
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May I ask what the thinning ratio for spherical heads is? I saw on the internet that some say it’s 0, while others say it’s nearly 20%. Please discuss
The thinning ratio of spherical heads depends on the manufacturing process and operating conditions. Typically, for cold-formed spherical heads, the thickness reduction can range from 0 to 20%. The specific thinning ratio needs to be determined based on the material and thickness of the head, as well as the degree of deformation during the forming process. When designing and manufacturing spherical heads, these factors must be carefully considered to ensure the safety and reliability of the heads. .
It is related to the manufacturing capacity of the factories; different manufacturers likely have different values, with most having a higher rate of thinning compared to elliptical end caps
The amount of thinning required in the manufacture of spherical heads is slightly greater than that of elliptical and disc heads, at about 15%. Appendix J of GB/T 25198-2023 \"Pressure Vessel Heads\" specifies the manufacturing thinning amounts for elliptical heads and disc heads, which are related to the nominal diameter and wall thickness of the heads. Application areas of spherical end caps are generally in high-pressure equipment. Furthermore, for towers with slightly higher pressure and larger diameter, if an elliptical head is used, the calculated wall thickness may be relatively large.