I am doing a Fire Sprinkler install with a not so savvy plumber and currently piping three flow control valves off a 4" main. Its a very tight space and I would like to know whether there is a specific takeout for grooving pipe. I only started grooved piping 4mths ago. e.g If the face to face measurement between two 3" fittings is 10", how much do i compensate for the grooves on either end of this 10" initial measurement so that I can get a good fit between the fittings. Since everything will be exposed I would like make certain than those three branches are installed plumb and square. Thanks
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Measuring, cutting & grooving steel pipe