Literally every heating system, which is based on the principle of burning a certain type of fuel, needs to withdraw various kinds of products obtained during the operation of the system. The final point of air with various impurities – chimneys. That is why, a very important point in housing construction is a design of the chimney. And this is not surprising, because it directly depends on what heat output will be produced, how much heat will go into the surrounding atmosphere, how much fuel will consume the entire system, as well as an not unimportant factor, namely, the purity of air in the inverted building.
Chimney functions.
The most important function of the chimney, of course, is the creation of a traction of such a force that can, by means of ordinary physical laws, remove all impurities from the building to the environment. The physical process that occurs inside the chimney can be easily explained. Due to the large difference in pressure in the boiler itself (system) and directly in the head of the pipe, all polluted air goes into the environment. If, part of the chimney system is located on the street, then, of course, it should be thoroughly insulated quite thoroughly.
It is necessary to insulate due to the fact that condensation occurs inside the chimney itself. Based on basic school knowledge, it is not difficult to remember that condensate usually appears where there is a temperature difference, in our case, the condensate will be inside the chimney. It is not difficult to guess that in the smoke that is displayed out is a bunch of various chemical elements. One of these elements is sulfur. It is because of it that the pipe itself from the inside with time comes into a very unsatisfactory state. The displayed smoke contains combustion products of different chemical composition.
Of course, new technologies have come to the fight against condensate, namely new types of pipes that are more resistant to such acid. But the thermal insulation of pipes, albeit a very old way, but one of the most effective that you can come up with.
Thermal insulation procedure of smoke pipes.
There are a lot of ways that can be insulated, but it is worth understanding that the most important thing in such a case is the thickness of the external walls of the chimney, this is what will prevent the sharp cooling of flue gas through the chur, and most importantly, the condensation of the appearance of condensate on the pipe.
If your pipe is asbestosae, then you need to isolate the outer part of the pipe. That part of the pipe that is above your attic ceiling. It is better to cover such pipes with brick. They are laid between a metal casing (rim) and the outer surface of the asbestos -cement pipe. The diameter of the rim is taken such that between the pipe wall itself and the free distance metal is more than 60 mm.
All thermal insulation must be done up to the edge of the pipe, this is carried out due to the sequential connection of individual segments (segments) of the casing. The top, as usual, is made with a small bias, and the gap that is formed between the metal and directly covered with the asbestos itself by the cement solution.
If you decide that you will insulate with bricks, then such a process takes place through plastering with a special lime-loser-liner solution. And the thickness of the applied solution itself begins-from 25-30 mm. The sifted, and most importantly, washed slag, which should be no larger than 5 mm, is added to the cement. At the same time, the pipe itself is previously carefully prepared: make special nets or use reinforcement. Each element is from each other at a distance of 15-35 mm from the surface of the pipe itself. But the most interesting thing is the surface of the pipe, it is first wetted with water, and the first thin layer of the solution is applied with the so -called spraying method, the subsequent layers are already more thick. There are no more than 5 layers. And the very last (finish) layer is not only leveled, but also diligently wiped, giving a tidy look. After all the above layers of cement hardened, all the cracks that appeared in the process of work are covered. The outer part of the pipe is covered with chalk paint, because it will reduce the return of heat of order by 25%.
Although, the most effective way is to facing pipes with special boards from asbest cement. Such plates are quite large (their thickness is 40 mm). They are attached on a special solution, and also fixed due to a strong wire. So the method is one of the best, because it will reduce the heat transfer up to 2 times!