A mitred bend is a change in direction in a pipe that is formed by connecting together wedge-shaped sections of straight pipe. "Cut and shut" is sometimes adequate to describe the procedure.
A mitred bend is generally regarded as a cheap-and-nasty way of effecting a change in direction. Many standards describe them as non-preferred, or even prohibit them. However, there are sometimes situations where a swept bend cannot be used, and a mitred bend is the only practicable solution.
The fluid friction loss in a mitred bend is greater than that in a swept bend of the same pipe diameter.
The piping designer usually has enough nonce to produce a general arrangement drawing for each group of mitred bends, assuming that standard drawings for these components do not already exist.
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though non english i too thought it is meters then googled
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We are doing a job for a Rotary Hearth Furnaces that requires many miters for the gas system there's a program called EZ pipe we use for templates. The engineers prefer this over the bends in order to allow for float and trim.