Spliced head weld coefficient
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For a container whose shell welds are double-sided welded butt joints, 20% radiographic inspection is required; the standard also stipulates 100% inspection for the welds of the elliptical heads. What value should be used for the joint factor in the formula for calculating the head thickness?
0.85: the acceptable levels for testing vary.
It should be 0.85, just like the main weld； If the head is not welded, take 1 ； 100% inspection of the main body, also result is 1.
The weld coefficient for the head joint splices is taken as 0.85, which is the weld coefficient for the longitudinal joints of pressure vessels
I didn’t really pay attention to this usually either; I followed what you said. But just now when I looked it up, I couldn’t find any specific regulations regarding 150
A weld coefficient of 0.85 is used in the calculation. The detection level is in accordance with local detection regulations. It’s simply a requirement that that weld be fully illuminated
The standard requirement for pressure vessel heads 25198 is 100% radiographic non-destructive testing. During calculation, if the head meets Grade II standards, the weld coefficient is taken as 1; if it meets Grade III standards, the coefficient is 0.85.