Bending radius
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How should the bending radius for infrequently used metal pipes be determined?
For ordinary pipes, a minimum bending radius of 1.5 to 2 times the pipe diameter is sufficient. But I’m not sure what kind of pipes you mean by those that are not commonly used
I think this can be found in a mechanical design manual or something similar; it seems that the bending radius is roughly 3 times the nominal diameter.
Commonly used ones are easy to say; those that are not commonly used depend on the specific situation, and it’s not easy to say.
The manufacturing standard for elbows in reference fittings is good; generally, 1.5D (1.5 times the pipe diameter) is used.
Generally, the minimum bending radius for pipes is taken as 1.5 to 2 times the pipe diameter, but this applies to pipes with standard wall thicknesses; if the wall is too thin, the bending radius may need to be much larger. It is best to consult the pipe manufacturer.