How to Bend PVC & Make Incredible Shapes





Introduction: How to Bend PVC & Make Incredible Shapes

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I was recently working on a project where I needed to bend pvc pipes into smooth, round shapes. After some trial and error I found an easy way to get great results.

Step 1: Testing

First of all, cut your pipe to size, I used a variation of different sized pipes for this test. I found that if you heat up the pipe only with a heat gun from the outside it's hard to get a smooth curve, and you easily get kinks. Plus, you can only heat up a small section at a time. What I needed to do was find a way to heat up the pipe from the inside out.

Step 2: Tape the End

Duck tape on the end makes a nice block and then I measured out how much sand fit inside the pipe. I used regular sand that I had on hand and then I heat it up in a pot until it was pretty hot.

Step 3: Filling the Pipe

I filled the pipe almost to the top, maybe with two inch empty space, and taped it shut.

Let the pipe rest for a few minutes to heat up thoroughly. Then with gloved hands you can start bending and manipulating the pipes. You can either do this freehand, or bend around something, like a jig or something round to get a precise shape.

Step 4: Different Pipes

Once I held the shape for a little while, I poured out the sand, and there you go!

I tried this technique with a couple of different sized pipes. The larger pipes took longer to heat up and were a little harder to bend, however it's still possible to get slight curves. The thinner pipes however become very maluable and easy to bend into all sorts of crazy shapes!

Step 5: Conclusion - Watch the Video

For a much better perspective, make sure to watch the video that goes over the steps, and to see how easily the different pipes bend.



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2 Tips

Rather than hold the final shape for awhile until it sets, dip the pvc in a bucket of cold water, maybe the 5 gallon size. A bigger project might need cold water from a spray bottle or a garden hose.

On the larger pipe, you can use a heat gun on the outside of the pipe while the sand heats the inside. You should be able to get a better bend out of it. Careful of the fumes. Do it in a well ventilated area.



Would this work using sea sand. I have a bag I bought for use in a sandpit.


that's really neat! I was a Pipefitter for 39 years and during that time I installed miles upon miles of pipe. This was one product that we never bent,(plastic). God knows how much steel pipe & tubing I've bent. And, this goes on the same principal in bending steel pipe. You have to fill it up with packed sand before you bend a tight radius.

Well Mr. kwhit, baybe you can tell me why all steel pipe is 21 feet long and PVC is 20 feet long? Something I have never been able to find out.-mike

Mike, that's just the way it is. But, with steel pipe you can't actually go by that 21 foot length either. I've unloaded large bundles of pipe that were of varying lengths when a shipment came into the shop. Most of the time they were 21" but sometimes they weren'tIt all depends on how the were cut when them came down the hotbed.

Fill the pipe with BBs if sand residue is a proble,

Sand residue can usually be blown out with a compressor, or a hair dryer.

BBs sounds good - but would't it cost a fortune?

If making only 1 or 2 bends, yes, but if you are making a lot of them, then no it amortizes out vs the time cleaning out the tube after each bend.

There are spring benders to bend condute pypes...

Anyone attempting this should be aware that, when heated, PVC may release CARCINOGENIC VAPORS. So always be in a well ventelated area and always wear suitable breathing protection