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@Opensource, No evidence that Reducing Tee shall be used, just past experience, in 4x2 and 3x2 case.

Water, B31.3 Chap. IX, pipe in 5L X65 PSL2

This is B31.3 High pressure designed class, see snapshot attached from ASME B31.3 Chap. IX. This ask for contoured branch fitting for welded branch connections. However, it's not saying that reducing Tee is not allowed. Correct me if im wrong.

reasonable is that use sweepolet rather than traditional weldolet. But my question is that compared to reducing tee, what the advantage to use sweepolet? Frankly speaking i never used sweepolet before...

This is high pressure piping and high velocity pipes. From cost/construction point of view, which is more preferable.

In our project, 2500# CS piping class, 3x2 and 4x2 branch fitting have selected Sweepolet, rather than Reducing Tee as per ASME B16.9, which is more common. Really confused for the selection of bran fitting selection. Anyone can help to figure out what's basis, and whether to go for...