Relationship between bending radius and tube wall thickness
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Bending radius (R): Before bending, the wall thickness of the tube should be such that R ≥ 6DN: 1.06Τm; 6ND > R ≥ 5DN: 1.08Τm; 5ND > R ≥ 4DN: 1.14Τm; 4ND > R ≥ 3DN: 1.25Τm. Note: ND – nominal diameter; Τm – design wall thickness.
The poster says, “It seems that ND as a path length doesn’t conform to the standards.”
Isn’t that specified in the national standards? Just take a look