1: The calculation method of the wall thickness of the seamless steel pipe with knowing seamless pipe diameter and withstand pressure

Pressure = 1Mpa

Outer diameter = 168mm

Coefficient = 8

Material tensile strength = 400Mpa

Wall thickness = (pressure * outer diameter * coefficient) / (2 * tensile strength of steel pipe material) = 1.68mm

2: The calculation method of the thickness of the outer diameter of the seamless steel pipe with knowing seamless pipe withstand pressure

Wall thickness = 2mm

Tube outer diameter = 21mm

Coefficient = 8

Material tensile strength = 400Mpa

Pressure = (wall thickness * 2 * tensile strength of steel pipe material) / (outer diameter * coefficient) = 9.52Mpa