Pvc 90's

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When a pipe is bent, it tends to ovalize. Also the couplings are straight and obviously, the bent portion is not going to be straight.
If you are using PVC, you can heat it up to about 200? and bend it all you want. Boiling water works. I don't know why you would be using store bought elbows.
~Peter
 
I thought it was kinda stupid myself.If we need 45s then buy them.Only reason to buy premade is a time and location issue.My thinking is it might not even be legal since it is altered
 
Can't say I ever cut a 90 in half. When short on 45's I always just got out the heating blanket and made one.
Seems like wasting a good 90 to me.
 
Not recommended

Not recommended

Jim I don't think altering a piece of conduit is a issue, the problem is how mechanically sound is the connection after doing this?

When you are bending EMT you have times that you have to cut into stub don't you ??

Well the same thing applys here with PVC , go to far and the fitting does not go on all the way and the connection is poor.

Besides all that it does not look very good either does it ??
 
Glad to know others think it poor idea too.4 inch is hard enough to deal with.And i question how water tight they will be.It is just fiber so guess it be ok.But did waste time.Chalk it up to poor planning.
 
I did once have to cut a 90 to make an offset, but it was 4" EMT. I had to zig-zag over a large duct and under the main structural beam running under the center of a commercial building.

The most time spent was filing the cut edges before hammering on the couplings. My boss was actually pleased with my work, because the option was an additional 20' of pipe and wire.
 
celtic said:
Do you know the "6 P's"?
Click to expand...

Would that be, 'Proper Planning Prevents Piss-Poor Performance?'

As for the questions of why one would be using factory bends on PVC, I've done it many times for uniformity on exposed PVC runs I've had to do in Tel-Data centers. If it's under ground, the heat gun comes out. I had to bend 4" one day years ago with no heater. So on the exhaust pipe it went. It took quite awhile to heat up, but I got the job done.
 
While straight lengths are intended for cutting and bending i dont think 90s are intended to be cut.They waisted lots of time heating to fit a coupling.Is there any rule to them being air/water tight ?
 
Jim you may be right about the water proof part of the problem.


part of 352.10(D)
(D) Wet Locations. In portions of dairies, laundries, canneries, or other wet locations and in locations where walls are frequently washed, the entire conduit system including boxes and fittings used therewith shall be installed and equipped so as to prevent water from entering the conduit.
Click to expand...

I have never tried that trick with PVC, I have done it wih EMT but feel like the others....not recommended.
 
Had to make a 2" pvc 90 yesterday. Way out in the woods far away from the shop and the hardware. Broke out the heat gun and wasted some time because I forgot to bring one with me. I've never cut a 90 to make a 45, but I have heated a 90 to make a 45. A little heat in the center and it will straighten right out.
steve
 
IF you have lots of glue on hand, and are in a real bind, dig a ditch, pour the glue in the bottom and light it. now you have in inground heater. Don't laugh, it does work. Ever cut pvc with nylon string???
 
Cavie said:
IF you have lots of glue on hand, and are in a real bind, dig a ditch, pour the glue in the bottom and light it. now you have in inground heater. Don't laugh, it does work. Ever cut pvc with nylon string???
Click to expand...

The string idea i have used for many years in tight spots.The glue fire sounds costly.Tail pipe in a pinch will work too.But 4 inch pvc 90s take forever to get them back to round.Wasnt my project so had to deal with others poor planning.
 
Cavie said:
IF you have lots of glue on hand, and are in a real bind, dig a ditch, pour the glue in the bottom and light it.
Click to expand...

Nevermind the toxic fumes...
woah.gif
 
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