Pipefitting Question

I would appreciate any tips on mitering/fitting some pipe. Specifically I am working with 6" thin wall making a

3 piece 90, and a double 45 offset. Flame cut, stick welded I have a copy of The Pipefitters Handbook by Lindsay. and have used the tables and instructions for layout and have only so-so results. I also have WinMiter and printed out a 22.5 degree template for 6". It doesn't match the Lindsay tables when measured. The tables in lindsay show a 2.75" mark off and the winmiter printout are measureing 2.375". And neither one matches the layout I did directly on the pipe...where I had top, bottom and 90 deg marks, those are accurate and marked with felt tip.

My direct layout was a paper strip wraped around, marked, folded double and again to get accurate marks.

The winmiter also has a curve on the narrow end I don't understand that.

Is making a paper template the prefered way to get a tight fit? It sure looks better than trying to draw out one on the pipe.

Also I'm using a Miller Tbolt ac/dc and using 3/23 6011 It look ok but is there a prefered rod/procedure for this type of work. I'm tacking and then working in sections. Cleaning slag each time ect.

The fitting will be on a water pump so I have to get a solid bead, no leaks. I will do a water test before hooking up.

Thank ED

Reply to
ED
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Richard

Reply to
AMW

Doing it with trig I get 2.3869 which is very close to Winmiter's 2.375. This is for a pipe that is six inches outside diameter. We won't argue about ten thou. since you are using a torch :'))) The only problem is that pipe usually is 6 5/8th inch outside diameter. I would first check the exact circumference with a flexible tape such as a fifty footer then divide by pie to find the exact diameter of your material. My guess is that your other source is giving you a pattern for a nominal 6 inch pipe which is not 6 inches in diameter and your WinMter is doing the calculation as instructed. If you think you are having trouble... We got nice templates laser burned out of sheet metal for three foot diameter pipe. Those wraparounds still had to be fudged after a trial fit on pipe that had been braced round inside before fitting the mating unit. Randy

I would appreciate any tips on mitering/fitting some pipe. Specifically I am working with 6" thin wall making a

3 piece 90, and a double 45 offset. Flame cut, stick welded

I have a copy of The Pipefitters Handbook by Lindsay. and have used the tables and instructions for layout and have only so-so results. I also have WinMiter and printed out a 22.5 degree template for 6". It doesn't match the Lindsay tables when measured.

The tables in lindsay show a 2.75" mark off and the winmiter printout are measureing 2.375". And neither one matches the layout I did directly on the pipe...where I had top, bottom and 90 deg marks, those are accurate and marked with felt tip.

My direct layout was a paper strip wraped around, marked, folded double and again to get accurate marks.

The winmiter also has a curve on the narrow end I don't understand that.

Is making a paper template the prefered way to get a tight fit? It sure looks better than trying to draw out one on the pipe.

Also I'm using a Miller Tbolt ac/dc and using 3/23 6011 It look ok but is there a prefered rod/procedure for this type of work. I'm tacking and then working in sections. Cleaning slag each time ect.

The fitting will be on a water pump so I have to get a solid bead, no leaks. I will do a water test before hooking up.

Thank ED

Reply to
R. Zimmerman

Thanks, that was it exactly, this pipe is 6.01", now with the correct cutback the fitup is nice, also borrowed a pattern to help layout and cleanup after the cut.

3' pipe, wow thats some serious iron..I imagine that for a gas line that has to be perfect first shot, no second chances..

ED

Reply to
ED

Sorry to disappoint you Ed but my line of work is structural. They were pipe frameworks that fit over pilings driven into the water. Still a nice fit makes for a stronger joint and less welding. Randy

Thanks, that was it exactly, this pipe is 6.01", now with the correct cutback the fitup is nice, also borrowed a pattern to help layout and cleanup after the cut.

3' pipe, wow thats some serious iron..I imagine that for a gas line that has to be perfect first shot, no second chances..

ED

Reply to
R. Zimmerman

No disappointment, dang 3'tube= 9' of bead thats takes a good bit of concentration, not to mention coordination with a crane operator or whatever postions the work.

ED

Reply to
ED

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