Recently, my beloved wife asked why heating pipes are laid with "P" shaped appendix, this is not profitable and requires additional costs. I explained to her that this is required to compensate for the parasitic elongation of the pipe, we figured out this issue in the last article. Even in Photoshop I had to add arrows and circles.
But literally today she asked a new interesting question if the heating pipe is laid with expansion joints. That is why the pipes delivering hot water to our apartment are laid without "appendices".
Interest Ask. Is not it? It turns out that the choice of pipe material depends on the temperature of the liquid in them.
The temperature of the liquid that carries heat to our homes can reach temperatures of 150 degrees Celsius in severe frosts. If this is not the case, then experts will correct me in the comments. Therefore, an iron pipe is used that can withstand such loads, with an external insulation and a pipe rupture warning system. I talked about them here.
Since iron has a high degree of linear expansion, it requires room for elongation.
Nowadays, pipes supplying domestic hot water supply to our home are replaced by a special pipe with several polymer layers. Why not on the iron, you ask yourself this question. And it's all about the temperature at the entrance to the house, according to the norms, hot water should be at least 60 degrees. Usually it is 60-70. And this temperature is kept by polymer pipes.
Which serve, according to the manufacturer, for at least 50 years, in contrast to the iron ones.
I was not too lazy, I went to take a special picture for my reader, like this special. the pipe looks like a cut.
Such a pipeline, unlike an iron pipeline, has a minimum expansion coefficient. Therefore, she does not need a compensator. Does not corrode from hot water. Thermal insulation at the highest level. Minimum installation costs.
On the right, fully polymer hot water pipes. On the left, there are iron heating pipes in a special polymer sheath.