Everyone, please help with the issue regarding the fitting R=5D
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I have here the dimensions of several pipe fittings: 90° steel elbows, 114° steel elbows, 115° steel elbows... up to 168° steel elbows. The specifications for all of them are DN300Ⅱ-Sch30-20, with a radius R ≥ 5D. I’m not sure what these elbows look like; could someone who knows give me a simple diagram of them? Thank you!
By cutting standard 90° elbows, elbows with different angles can be obtained, such as 114°, 115°, and 168°. However, elbows with R=5D are considered non-standard elbows; they are manufactured by heating pipes filled with sand. If the required wall thickness for the elbow is Sch30, the manufacturer can only use pipes with Sch40 thickness for hot bending, as the pipe thickness decreases after hot bending. Our standard long-radius elbows have a radius of R=1.5D; elbows with R=5D have a bending radius that is 5 times the nominal diameter of the pipe.
Such special elbows are generally used inside the furnace.