Manufacture a multilayer tube straightener.

[izentrop]

Hello,
I have an old central heating plant, which is leaked due to tin-welded steel and copper-welded tubes. I decided to redo the multi-layer pipe diameter 20 and 16 before installing the new heater.

When we see the price of marketed rectifiersit's worth it to make it. I found lots of small wheels for a derisory take (2 times eight).

In a piece of 2,2 plywood cm thick on 40 long, I cut out of 2 boards of 5 wide and 2 others of 10.
The rollers are fixed all 12 cm and their thickness is 1.9 cm, which makes 5 cm of inner sides for 16 tube.

For the 20 tube, I would separate the 4 mm sides with shims.

Not very aesthetic but does the job asked is the main

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[lilian07]

I like the idea.
I'm just trying to do the same thing with PEX 32 mm.
I imagine that the pipe is straight then.
Good installation.

[izentrop]

PER PEX?

The multilayer contains a layer of aluminum and when you straighten it, it keeps the shape. The PER is only plastic. Not easy to straighten it, you must exercise a reverse twist and we quickly made an irreversible fold.

For the adjustment in diameter, instead of the screws that assemble the sides, I will put a metal plate at each end, with holes shaped light and a central hole for the passage of the tube.
It will be enough to loosen the screws to allow adjustment, provided that it does not slide too easily.
Following the next number

[Christophe]

Good idea and easy to achieve, it's the time of the DIY with the recovery mine of the moment: gardening / build-and-a-house-hotel-a-bat-t15698.html

Otherwise I think that all PER (sold in France at least) currently have the anti-oxygen barrier (aluminum layer) ... except perhaps those for sanitary water?

I was going to propose also to think about a setting on the diameter! If I understand your idea, I think you will need only a setting on 2 angles (2 L sliding so), this should allow to rectify most of the tubes PER market!

[izentrop]

I think that all PER (sold in France at least) currently have the oxygen barrier (aluminum layer) ... except perhaps those for sanitary water?

It needs the name PER BAO in this case for heating (more expensive than sanitary) and it is not aluminum.

The oxygen barrier, consisting of a layer of EVOH (Ethylene Vinyl Copolymer) prevents oxygen from infiltrating. It thus limits the formation of sludge in the networks and promotes a greater longevity of the tubes in the installations. https://www.comap.fr/faq/est-interet-ba ... -sur-tubes

If I understand your idea, I think you will only need a setting on 2 angles (2 L sliding therefore)

I thought, given the width of the wheels, but shots, the support will not be centered on the axis of the wheel. I would see when the time is right.
As the pose is going to be apparent, the white multilayer is more aesthetic than the red or blue PER.

[izentrop]

I took again your idea of ​​2 L sliding.

For this, I cut 2 squares of 11 side cm in 1 plywood cm, pierced with a hole of 3 cm centered on the passage of the tube, which makes it possible to treat the tubes of 26.
The bottom L is permanently fixed with 3 screws on both sides.
The top one holds by the golden screws.

I set it for the 20 tube I'm going to put first and it works fine

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[Christophe]

I took again your idea of ​​2 L sliding.

(...)

I set it for the 20 tube I'm going to put first and it works fine

Uh yes once I'm not too bad in design

[Dams52]

Hello and thank you for this very useful tutorial

Would you have a plan or photos of the rectifier from different angles after your last changes please?

I am trying to make the same thing but I did not understand the system to adjust the spacing.

Thank you

[izentrop]

Hello,
Drop it there is more simple: unroll it by pressing it to the ground while holding it with the feet, without crushing it of course. It works as well.

Then there are simpler and more effective than the bending springs that they sell in large areas: it is to use a flexible electric cable with a slightly smaller diameter threaded inside the tube. For example 13 mm for a 16X2 tube with an internal diameter of 14

No risk of bending at an angle even with a small radius of curvature and easier to put on and take off than the springs.

PER BAO is easier to find today. To start again, this is what I would have chosen, with slip press fittings, much more robust in my opinion than the multilayer press fittings which have fragile O-rings.

This year I'm redoing the kitchen, the last plumbing done, no more copper in the house, no lead for that matter

[Dams52]

Hello,

Thank you for your detailed answer.

The problem I have is that when I unroll flat on the ground there are always zig zag on the tube so for the apparent it is not great. Is it the same with the rectifier?

Thank you for the tip of the electric cable but I am already equipped with a spring.

I hesitated a long time between per and multilayer to finally choose the multilayer because installation in apparent in the basement but ultimately I am disgusted it would not have been worse with per, the multilayer crowns are difficult to straighten without suitable gear. .. And it would have cost me a lot less too.

I don't know what to do anymore Iron per or continue multilayer