Calculation of seamless pipe wall thickness
Thread Content
When calculating the wall thickness of seamless steel pipes, what value should be used for the welding joint coefficient? If it’s set to 1, hasn’t seamless pipe connection been considered? Our radiographic inspection rate is generally 5% – how should we determine the weld joint factor?
When calculating the wall thickness of seamless steel pipes, the welding joint coefficient refers to that of longitudinal welds, not circumferential welds; therefore, a value of 1 is used.
It’s fine to use 1; there’s no need to consider the welds at the pipe joints, as this is already taken into account in the design. The inspection standards are determined based on the pipe grade
Choosing 1 is correct. The welding joint coefficient refers to the coefficient for welded steel pipes and seamless pipes, not the coefficient for welding two pipes together; so there’s no problem