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I'm trying to install a 45° elbow joint in PVC. I've found several suggestions online, but frankly, they are incomprehensible to me and seem contradictory of one another:

Is there a straightforward way to calculate the takeoff?

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Wouldn't it depend on the particular fitting being used? – DA01 Apr 26 '13 at 18:02
Such ratio calculations may give you an approximately useful value, but there are variations between manufacturers, and of course fittings. I wouldn't trust anything if real accuracy is needed except actually measuring or using the manufacturer's dimension tables. – bcworkz Apr 26 '13 at 21:56
up vote 2 down vote accepted

First, a definition of "take off": The length of pipe to be removed (taken off) such that a pipe and a fitting make a specific length. The term is a concept shorthand used by pipefitters and plumbers. This is not the same as a material takeoff, which is a list of all materials needed for a project.

Take-offs in general are specific to pipe construction (PVC, copper, etc.) and is a function of diameter.

As suggested by bcworkz, tables for a given diameter and style of pipe are the best method for an accurate measurement.

The formula (listed in your link) .625 x pipe size (don't use the 25.4 factor, unless you are using millimeters) should give you a ballpark for a 45 fitting.

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Yes a 45 degree elbow has a take off of 15.9 while 90 degree elbow has 38.1

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We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.

Welcome to Stack Exchange. Sounds like a good answer, but what are the units, and what pipe diameter are you talking about? – Daniel Griscom Mar 25 at 19:01

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