Multistage bend in pipework

摘要

The multistage bend is for pipelines carrying solid materials liquids or gases. It is made by welding three straight pipe sections (1-3) together, using mitred joints. The angle of the second mitred joint may be greater than the first. The point (S) on the outside of the second mitred joint may lie on the line formed by continuing the line of the inside surface of the pipe on the inside of the bend. The point my lie outside this line by a distance t, where t is equal to or less than the inner diameter Di of the first pipe. Pipes carrying solid materials may have thickened walls on the bend, especially on the outside.