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 and the function of a elbow is to change direction or flow in a piping system. By default, there are 5 opportunities, the 45°, 90° and 180° elbows, all three in the "long radius" version, and in addition the 90° and 180° elbows both in the "short radius" version.
Now lets find the take off for 90 degrees and 45 degrees long radius elbow
This is the formula for to Take off for 90 degrees elbow
Formula
Tan(45)×1.5D×24.5
Where D is diameter of elbow in inch and
A is elbow center (take off)
When we calculate with the help scientific calculator
Enter diameter of valve in inch as the given formula show in picture
Now lets see the formula for 45 degrees elbow (LR) take off
Formula
tan(22.5)×1.5D×25.4
Where D is diameter of elbow in inch and
A is elbow center (take off)
for example 4 inch 45 degrees elbow take off calculation
By using scientific calculator
Enter diameter of valve in inch as the given formula show in picture
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