Weld joint coefficient
Thread Content
In pressure vessels, the cylinder is a seamless tube; due to structural reasons, girth welds can only be made with gussets. What is the welding joint coefficient for 20% radiographic inspection?
So many people can’t figure this out; the person who wrote this standard isn’t very competent, as the standard is written in a poor quality manner
Thank you for your answer, but I’m not sure what your basis is
1. According to our country’s standards, the coefficient for longitudinal seam weld joints is 1, which is used in calculating the thickness of seamless steel pipes. 2. According to ASME standards, it’s a bit complicated.
Using a weld joint factor of 150.1, isn’t the value for local inspection of single-sided welding with gussets 0.8?
The coefficient for the longitudinal weld joint is used in the calculation of the cylinder...
I personally think 0.8 is a more reasonable value. The welding joint coefficient refers to that of the entire pressure vessel, rather than that of a single pressure-bearing component.
If this cylinder is a seamless tube, then its diameter is relatively small. Is this material a non-ferrous metal? Such as aluminum alloy. Longitudinal seam welding coefficient: 1. Circumferential seam welding coefficient: 0.8
The actual situation is as follows: There are drawings prepared by a design institute – the diameter of the pipe is 273, and the material used is S30408. Gaskets must be used. The design data sheet states that the joint coefficient is 1, but the value for the ring gap RT is 20%, which is a bit confusing. It could either be that the joint coefficient is 1 with a ring gap RT of 100%, or it could be that the joint coefficient is 0.85 with a ring gap RT of 20%. Is there anyone here who knows the relevant standards?
In my opinion, there isn’t much difference in the calculation results when using weld coefficients of 0.8 and 1; theoretically, however, 0.8 is a more reasonable value, as it results in a slightly more conservative estimate.