The issue of rounding the inner diameter at the joint
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On page 292 of GB/T150, it is stated that \"Under the following operating conditions, the corners of the inner diameter of the nozzles should be rounded, … a) Pressure vessels subjected to alternating loads.\" How should we understand “alternating load” here? Under what circumstances is it considered a alternating load?
Alternating loads – for example, in pressure-containing vessels, when the pressure changes, the pressure exerted on the vessel itself also changes accordingly.
This area is a stress concentration point; rounding it reduces the stress.
I understand that there should be pipe openings through which materials enter and exit intermittently, subject to intermittent impact loads. But it’s quite problematic; the equipment specialists are unable to make a judgment.
But now many drawings require the inner edges at the end of the pipe to be rounded