Problems with welded joints
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When using SW6 to calculate reinforcement for openings, there is a \"weld joint coefficient of the shell at the opening\" – I’m not sure how you all enter this value. . .
Under normal circumstances, the welding joint coefficient of the input device is used; special cases are handled separately.
We usually enter 0.85
According to the standards, if there are no welds at the openings, the welding coefficient is taken as 1.0 regardless of whether it is 1.0 or 0.85. However, for safety reasons, it is better to enter the welding joint coefficient for the shell at those openings based on the equipment’s welding coefficient; generally, the thickness of the connecting pipes does not differ by many millimeters
Agreed. That’s how we handled it as well.
When using SW6 to calculate reinforcement for openings, the program first needs to determine the calculated thickness of the shell at those openings, in order to identify the excess metal in the shell. Therefore, the \"weld joint coefficient for the shell at the opening\" should be the weld joint coefficient specified in the shell design; it cannot be determined arbitrarily! !
The welding joint coefficient for the shell at the opening is the same as that of the equipment shell, and it is generated automatically by the program.
Regardless of the equipment’s weld joint coefficient, it is taken as 1.0. See the lecture notes for sw64.0. 1. The openings in the equipment should not be located on the longitudinal seams; if they are, those responsible for the process layout can be held accountable. 2. Even if it is brought near the ring seam, it remains at 100% RT within the 1.5-fold range required by 150, and moreover, the likelihood of it reaching the ring seam is low. The welding joint coefficient has little to do with the circumferential welds (within the scope of national standards). In typical layout designs, it is possible to avoid positioning the circumferential welds and longitudinal welds in close proximity to each other; therefore, a value of 1.0 can be used
Strongly agree with the person above. No holes are made in Class A welds. For Class B welds, refer to the manufacturer’s process specifications. Reputable companies will prepare special layout diagrams to ensure that all components avoid the longitudinal weld seams as much as possible. However, some smaller manufacturers do not create such layout diagrams; they simply make sure that the welds are not of type A, handling things in whatever way is most cost-effective.
We must enter 1, because when making holes at the welds, 100% flaw detection is required, so we use 1