How should the thickness reduction rate for end caps with a diameter smaller than DN300 be determined?
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How is the thickness reduction rate for end caps with a diameter smaller than DN300 generally determined? In GB/T25198-2010 \"Pressure Vessel Heads\", the reduction rate is specified only for nominal diameters of 300 DN or larger. So, how should the reduction rate be determined when using EHB heads with nominal diameters smaller than 300 DN?
This can be consulted with the manufacturer; the thinning rate specified in the standards is quite conservative
A value of 10% is generally considered very conservative.
The standards also state that small end caps can be used as a reference; we have employed 159 end caps in our previous designs as well
Currently, the thickness reduction rate for end caps can be reduced to below 7%, and considering 7% is sufficient.
The thickness reduction of small-diameter items is minimal; in some cases, local thickening may occur due to processing conditions – for specific details, consult the manufacturer. If a document requirement is specified, you can refer to existing standards!
Refer to for implementation? Refer to the lowest tier?