Recently I was in the village Bath, I noticed a stove made of thick metal and a chimney in it. I became curious about the design of the chimney because I myself recently assembled a stove from cast iron and a chimney from a sandwich of pipes.
For those who are not in the know, "Sandwich pipe" is an element of a sauna stove that removes burnt, hot gases from the combustion zone.
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When working with high temperatures, any pipe, be it brick, metal or sandwich pipe, gets very hot.
In the photo above, you can see how a homemade chimney was made. A platform is welded to the starting pipe. A brickwork is laid out on it. The so-called ceiling pass-through unit. In a cold attic, the extension of the pipe looks like this:
The brickwork lasts about a meter and a larger diameter aluminum pipe is inserted into the lower pipe.
At the owner of the bath, as it turns out, when I was a stove-maker, I asked. Why don't they use modern sandwich pipes for baths? To which I received weighty arguments, with which I do not quite agree:
“In our village, many were burned by these pipes, literally and figuratively. Firstly, they do not serve for a long time, they constantly burn out, especially on homemade stoves. Their filling is crumbling and from this the ceiling (the ceiling of the bath) can catch fire, there has already been a precedent. The high price and short service life have pushed many villagers away from know-how.
Continuing the dialogue with the stove-maker, I came to the conclusion that all the problems faced by rural residents are due to lack of awareness:
Many people bought sandwich pipes for their baths made of thin galvanized steel, of course after the first the heating of the bath, the zinc burned out, further the thin metal "evaporates" from the effect of the high temperature and the pipe came into disrepair. Even if you use stainless steel pipes, but with a low content of alloying elements (400 and 200 grades), they also quickly deteriorate. And it is desirable to use such steels: 304, 316, 321, yes, they are expensive, but they have high heat resistance and acid resistance, which prolongs the life of the pipe and ultimately saves money for the owner of the bath.
It turns out that many people think that the sandwich pipe was invented to protect the floor from high temperatures, therefore, from fire and additional protection of the floor is not needed. DEEP delusion. Such a pipe heats up longer, but over time it can also transfer heat to surrounding objects, which will lead to a fire. Therefore, additional protection is required in the form of a ceiling bushing. In addition, it is important not to strongly seal the PPU filling with non-combustible materials, so that the heat from the walls of the "fashionable" pipe is discharged into the attic.
In addition, any stove does not like the "Crazy Stove Maker" mode, this is when the stove is filled with wood and the blower is opened at full capacity, thereby stoking the street and overheating the pipes. Particular overheating of the chimney in this mode occurs in home-made stoves with "direct flow of burnt gases" Therefore, sandwich pipes do not last long in homemade products that eat a lot of firewood to no avail.
Tip of the day
In order to choose the right stainless steel chimney, we need a magnet and a caliper. Well-alloyed stainless steel should not or weakly magnet. Which indicates the durability of the metal in the chimney. And the thickness of steel in a good sandwich pipe should not be less than 0.8mm.
The author of the article "Viktor Mikhailov". Welcome to the channel! Subscribe. All good!