What is take off in pipe fitting?
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.
How is fitting allowance calculated?
An accurate dimension from the end of the nipple to the centre of the outlet is then measured. This is repeated for each of the nipples. The difference between the end-to-end measurement and the end-to-centre (of the 90) measurement is the fitting allowance.
What is end to end pipe measurement?
Taking an End-to-Centre Measurement Correct technique involves hooking the tape measure over the end of a pipe, aligning the tape to be parallel with the pipe, and measuring to the nearest ⅛”. Fitting allowance is an important concept for young people investigating trades to understand.
Where does the pipe fit in a pipe fitter?
There will be a piece of pipe in the upturned end of the fitting that will come into the bottom of the second 45° fitting (Fig. 2.1: offset drawing). As we talk about measurements here, they will all be measured from the center of the pipe.
What’s the best way to fit a pipe?
You have to offset the pipe over a piece of ductwork. This will have a 45° fitting looking up from your horizontal pipe. There will be a piece of pipe in the upturned end of the fitting that will come into the bottom of the second 45° fitting (Fig. 2.1: offset drawing).
Are there any offsets for 45° pipe bends?
Offsets for 45° bends are common needs in both plumbing and pipe fitting. In fact, this degree of offset is one of the most common in the trade. I mentioned FIGURE 2.1 ■ Calculated 45° offsets. earlier that many plumbers eyeball such offset measurements.
What is the distance from the center of a pipe?
The distance from the center of the lower horizontal pipe to the center of the upper horizontal pipe is called the Set. Now that you know the terms, we can do the math. To make doing the math easier, I am including tables for you to work from (Fig. 2.2: 45° offset math tables). Let’s say that the Set is 563/4 inches.