Welded HDPE and polypropylene. Saved on transitions. Can you do this? We find out.

  • Dec 16, 2020

Hi dear friend, why waste money on threaded adapters when you can weld a black water pipe (polyethylene) to a "white" pipe (polypropylene)? If necessary.

Welded HDPE and polypropylene. Saved on transitions. Can you do this? We find out.

Indeed, why? With this message, one of the "experts" explained his art of installing water pipes, without adapters, on one of the resources on the Internet.

Welded HDPE and polypropylene. Saved on transitions. Can you do this? We find out.

What nonsense, I thought at that moment... You cannot do this, the materials are completely different, they cannot be joined by socket welding.

But a "worm" of doubt lodged in me, but what if I connected in this way and pumped into it 100 atmospheres! Yes, yes, you read that correctly, I can pump the pressure of 100 or more bar using the AED. Who reads me knows about this. This is what I will do, after reading to the end, I will see the result.

In the photo above, you can see that I have already started the welding process. It is noticed that polyethylene needs less time to heat up to a plastic state.

I dress a low-pressure polyethylene pipe in a polypropylene sleeve.

After waiting a bit, I wait for the complete hardening of two different materials.

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Let me remind you that in order to move from one pipe to another, you need to use special threaded fittings, which cost more than 50 rubles and a PP threaded coupling for another 40 rubles. And the PP clutch costs 5 rubles. This is where the author of the idea tried to save money.

In order to pump high pressure, it was necessary to make such a structure; earlier, with the help of a sink, I broke a reinforced pipe. Scroll to the right.

It remains only to break the pipe connection...

At a pressure of about 50 atmospheres, the "newly-made compound" flowed. But why, flip through the gallery.

Even when heated, they do not penetrate into each other, and they hold on due to the formation of their shaped lock, which will burst at the most inopportune moment. What do you think about this? I'm waiting for your comments.

Group for competition in Yandex. Messenger. Read the pinned comment.