Features of work on the liner of brick chimneys

An insert made of a material that resists destruction and high temperatures is installed inside the brick chimney to remove combustion products. The chimney sleeve solves the problem of poor draft in the old pipe and protects the inner shell from destruction. Inserts are made of different sections and materials, often round stainless steel pipes are used.

Chimney sleeve process

The procedure involves the selection of the liner by material, type of section and transverse area. An insert is placed in the chimney along the entire vertical section of the outlet duct.

The problem with the destruction of internal surfaces is solved by two methods:

• dismantling the old pipe and laying a new one;
• sleeving of a brick chimney.

The first option refers to labor-intensive work and requires certain costs. Disassembly, purchase of materials, payment for the work of a bricklayer is required. They refuse to replace the furnace structure and make inserts into the existing pipe.

The essence of the process and the need

Over time, soot accumulates on the inner walls of a brick chimney, as a result of which the passage narrows and the draft deteriorates. Rough surfaces are affected by temperature extremes, condensation and aggressive smoke components. Insufficient removal of combustion products disrupts the operation of the heating system, and the thrust overturns.

Sleeving means installing a pipe in an exploited chimney. Stoves are advised to do the operation during the construction phase of a fireplace or stove. The dwelling is constantly heated, the inner surface of the masonry collapses and over time, the installation of a sleeve becomes a necessity.

How is it useful

The smoke from the boiler furnace passes inside the liner and does not come into contact with the rough brick plane. The insert can be installed without waiting for damage and destruction of the smoke exhaust duct. Gas condensate in a pipe is an aggressive composition of moisture and chemical oxides.

When wood and coal burns, vapors and carbon dioxide are formed in the firebox, moisture is released from the wood and exits with air through the chimney. The difference between the outside and inside temperature in the pipe leads to the formation of drops and their settling on the walls. Soot is oxides of sulfur and nitrogen that interact with moisture and erode surfaces.

In what cases it is necessary to do it

The plug is an alternative to the reconstruction of the chimney to restore efficiency. The procedure is relevant if there is no possibility of rebuilding the pipe or installing a new one. Hose-in is possible only in chimneys with low exhaust gas temperatures and in high heating systems.

The chimney is an engineering and technical structure, the safety of the home in terms of fires depends on its quality. Sometimes a pipe is made of hollow stones or a dried solution remains on the walls inside, reinforcement outlets.

The liners are characterized by a smooth surface, so combustion products leave the channel without hindrance. The earbuds also become unusable over time, but are easier to replace.

Nuances and requirements for the liner of a gas boiler chimney

The chimney sleeve is a necessary solution if the pipe is made of bricks. The presence of the insert does not protect against the appearance of condensation drops, but with the help of the lining, an organized moisture removal can be ensured.

Before casing a brick pipe, you need to prepare:

• inspection of the chimney;
• checking the shape of the section;
• identification of the degree of contamination;
• pipe cleaning;
• check of tightness and functionality.

The section is often represented by a rectangle with dimensions of 14 x 27 cm; before installation, the dimensions of the sleeve, its length and shape are determined. Attention is paid to the cross-sectional area, because an insert in the channel narrows the outlet.

Varieties of sleeve

The principle of behavior of lined liners and their placement in the channel is the same, but the liners differ in material, therefore there are certain nuances for each type.

Specialty stores offer inserts:

• from polymers;
• of steel;
• from a corrugated pipe;
• polymer sleeve;
• made of stainless steel.

The inserts are selected depending on the preference of the owner and his capabilities. Consideration is given to durability, acidity and weather resistance.

Polymer sleeves

A plastic pipe is installed inside the operated chimney. PVC products are reinforced with fiberglass fabric and become plastic when heated. As a result of this property, irregularities and spaces on the clinker surface are filled. After hardening, the inner area becomes smooth, and the wall is 2 cm thick.

The disadvantage of the application is the temperature limitation. The liner of the chimney made of brick with plastic is made with diverted flows up to + 250 ° C, therefore they are set to work with low-power units.

Application of steel elements

In the straight section of the chimney, a structure made of a rolling pipe is placed or rectangular, square, oval and round shapes are made with their own hands. Sheets are taken with a thickness of 0.5 to 1.5 mm. In ducts made of steel materials, it is possible to provide the required modules for cleaning, inspection, tanks for accumulating condensate in accordance with the standards.

Steel products are used for hearths using various types of fuel. The material resists the action of acids, is not susceptible to plaque deposition. The disadvantage is that only straight sections can be cased with this method, meandering pipelines cannot be equipped.

Use of corrugated pipe

Manufacturing is carried out using various types of stainless steel, pipe shells are made in two layers. On the positive side, flexible liners are used for difficult canals with curves. The products do not require connecting elements. Double-layer inserts significantly reduce the diameter of the duct, this must be borne in mind when choosing.

Corrugation is rarely used to protect the chimney of a sauna stove, because highly heated combustion products are discharged in the duct. The disadvantage is the embossed surface of the element, which contributes to the deposition of plaque.

Polymer sleeve

The sleeve is made of copolymer resin, reinforced with fiberglass. The insert is used to combat condensate drops, low-temperature chimneys and those that come from powerful boilers are processed with it.

Varieties of polymer products:

• Fitfire is a two-layer insert, the maximum element is 60 m long. After installation, the flue gas duct has a diameter of 80 - 500 mm. The manufacturer defines a service life of 50 years, the sleeve is used to remove low-temperature gases.
• Fitfire HT 1000 is used in the pipes of baths and fireplaces with high smoke temperatures. The sleeve consists of three layers, the middle layer is a reinforcing mesh.

When the chimney is cased with a polymer sleeve, the inner protection is obtained without seams, with a smooth surface.

Stainless pipe

The material is one of the most popular types. Products work for many years, do not deform due to high temperatures, corrosion. The sleeve lining of a brick chimney with a stainless pipe is often used, because there is a large assortment of ready-made inserts on sale, sometimes the products are made with their own hands, taking into account the sizes.

Inserts are made of stainless steel sheets with a thickness of 0.8 - 1.5 mm. To connect, turn the channel, standard tees and branch pipes are used, but to install them, you need to know the exact layout of the smoke ducts. Sleeves with rectangular cross-section are installed only on straight sections of chimneys.

Casing a brick chimney with a stainless pipe

Sometimes the installation of a tab does not require professional training and can be done with your own hands. To do this, you need to measure the cross-section of the chimney and determine the length of the product.

Height measurements:

• if the boiler is in the basement, the size is determined from the middle of the basement tier to the chimney head;
• when located on the first floor, the distance down a meter from the ceiling is measured and the height of the chimney is determined.

Another 500 mm is added to the resulting value. There are two types of brick chimneys: with a section of 14 x 27 cm (in 1 brick) and 14 x 14 cm (in half a brick). For the first case, an oval tube is taken, for the second, a round one is used.

Stages of work

After measurements and preparation, the installation is started, which assumes a certain sequence of actions.

• The clinker pipe wall is dismantled at the boiler connection section to such a height that a module for accumulating condensate, a cleaning hatch and a branch pipe for fume extraction are installed.
• Installation and fixation of elements in the channel vent is in progress.
• A sleeve is inserted into the pipe body at a level so that there is no obstacle for the installation of the next insert, the pipes are lowered on a rope, and the required number of liners is selected.
• The joining of the longitudinal elements is done using a heat-resistant sealant.
• The space between the brick and the stainless steel is filled with thermal insulation.

The plugging is done along the entire height, long channels are processed from top to bottom. At the end of the work, an assembly opening is laid from below.

Typical errors

When plugging, errors may be made, leading to a deterioration in the performance of the flue system. The elements are joined so that the joint gap is turned in the direction of the smoke passage. During installation, pipes can be deformed, wrinkled, and scratched.

Frequent mistakes are leaks when connecting inserts or mismatching elements. Partial casing of a certain section of the chimney is also an error, because the pipeline continues to collapse. When joining in a turn, you cannot use a pipe elbow instead of a special support element. Thermal insulation cannot be done in bulk, it is recommended to use roll materials.