Asking a question about the wall thickness of a fitting
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For the pipelines in long-distance natural gas stations, it is required to conduct targeted thickness tests at bends, tees, and other points where airflow impacts occur. The wall thickness specified in the construction material sheet should refer to the thickness at the pipe ends; however, actual tests are carried out on the outer curve of bends and the main branches of tees. The test results need to be compared with the original specifications, but no information is available regarding the original wall thickness. Is there any standard for this? For example, if a bend has specifications of PN10.0 DN400 with δ=10 and R=1.5D, then δ=10 represents the wall thickness at the pipe end. Are there any design requirements regarding the wall thickness of the outer curve? Is there some range for such values?
Find a new test, conduct comprehensive evaluations of multiple elbows, measure the thickness of the straight sections adjacent to the elbows as well as the thickness of their outer curves,,,,,. It seems that consulting the elbow manufacturers could provide the required data. For reference.
The wall thickness listed in the material table is the nominal wall thickness. . .
There are standards for chemical pipelines; you can search for them directly on Baidu
Generally, the wall thickness of the outer arc is slightly lower than the specified value, while the wall thickness of the inner arc is slightly higher than the specified value; a wall thickness of over 85% of the specified value is usually sufficient for use
For thermally bent pipes, reference can be made to the provisions of 8.7.1 in SY_T 5257-2012 \"Induction-heated bent pipes for oil and gas transmission\": the maximum allowable wall thickness reduction is 10% when the bending radius R = 5D, and 9% when the bending radius R ≥ 6D.
The specification requires that the minimum wall thickness not exceed 87.5% of the total wall thickness
δ=10 is the wall thickness at the end of the nozzle; no specific requirement is imposed on the wall thickness in other areas. The strength is ensured by verification tests to guarantee that it is not lower than that of pipes with the same wall thickness.