Re-equipping a private home for permanent residence, most choose a heating system using gas boilers. Good choice! This type of heating unit is economical and has high capacity. Naturally, making a correct calculation of the elements of the chimney and observing the installation rules.
Content
We design the chimney correctly
The heating system of a private house assumes a reasonable design of the main elements, including the placement and installation of a gas chimney. The correct location of the chimney, its type, size and cross-sectional area of the pipe will allow a successful subsequent installation.
There are rules on the basis of which a gas chimney is installed in a private house. This is primarily the requirements of Fire Supervision and building codes and regulations. What are the installation rules?
Recall that the ideal shape of the chimney for a gas boiler is considered a cylinder, a square and an oval.
However, the design of the chimney is not only a form, but also properly selected materials that withstand high-temperature exposure. In addition, the chimney must have a rectilinear configuration, without kinks and extensions with the maximum number of knees allowed, namely three. Full sealing of the joints and seams of the chimney should ensure unimpeded passage of the heated gas-air mixture in the required direction.
The flue is an operated system, therefore it is necessary to provide special droppers and inspection hatches that provide access and the possibility of carrying out cleaning or repair activities. Observing these rules, the operation of the gas chimney will be problem-free.
The device of the chimney
The most common type of appliance for which the chimney is arranged is gas boilers and solid fuel stoves and boilers.
The characteristics of the chimney are influenced by the following parameters:
• type of heater and type of fuel
• length of chimney and its configuration
• Section geometry.
The optimal length of the chimney is considered to be 5 meters long with a straight line.
The ideal section of the chimney is a cylinder.
Technologically, the chimney consists of the following connecting elements:
• adapter for connection of the branch pipe of the heating gas boiler to the chimney
• branch pipe
• telescopic pipes
• Main fasteners - clamp and wall bracket
• tee with revision
• tips and bends.
The connection to the chimney line must comply with regulatory requirements and regulated NBN standards D51-003. An obligatory condition is that the chimney for a gas boiler must have a strictly vertical position at the outlet.
Let's say that according to the boiler's rating capacity from the manufacturer, the diameter of the chimney is recommended to be calculated from the calculation of the minimum cross-sectional area, namely 5.5 cm2 per 1 kW. When organizing a chimney from two heating appliances to one main, the calculated cross-section is summed up.
Construction of the chimney: we adjust to the gas boiler
The type and design of the chimney must be adjusted to the design of the gas boiler. Therefore, the section of the exhaust hole is initially calculated. We will suggest that the sectional area of the chimney pipe is assumed to be slightly larger than the sectional area of the boiler outlet.
Each heating gas boiler is connected to an individual chimney. Diagrams are used to calculate the cross-section of the pipe.
The diagram is selected in accordance with the type of fuel used, the design features of the boiler (atmospheric boiler with a burner without a fan, a fan equipped with a fan), and the temperature of the gas-air mixture at the outlet.
For example, for an atmospheric gas boiler with a burner without a fan, with natural gas fuel, a heating capacity of 30 kW, a chimney height of 12 m, a length of connecting elements of 2 m and two turns of 90 ° and a temperature of the smoke mixture after stabilizing the flow of 80 ° C, section of the chimney is 14 cm.
Types of installation of chimneys
There are the following types of installation of gas chimneys:
• internal
• Outside.
Installation of the chimney inside the building is a complex system, which is installed during the construction phase in compliance with the requirements for safety. At the same time, they strengthen the protection of the passage of pipes in the interfloor and roof. The upper part of the pipe is insulated.
The simplest version is an attached chimney. The organization of the chimney is carried out through a hole in the wall, but the whole length of the main line is subject to thermal insulation.
Regardless of the location and installation of the chimney, the following work will be necessary:
• Prepare the pipe and assemble the chimney
• to assemble the assembled structure to a gas boiler
• fix the chimney on the work surface
• Insulate and seal joints.
Recall that a single chimney connect to 1-2 heaters.
An important stage in the installation of the chimney is its thermal insulation, which is carried out with a mineral filler followed by wrapping with foil or by installing a stainless steel sandwich tube or a coaxial chimney.
When installing, you must follow the rules:
• the gas boiler and the chimney are connected with the use of a sealant, the presence of gaps is unacceptable
• the chimney base of their lead must be sized to fit the roof
• step of the clamps arrangement horizontally - 1.5 m and vertically - 2.5 m.
• intermediate fastening (console corner) is installed with an interval of 10 m.
These requirements for installation are minimal. Naturally, depending on the brand of the boiler, in some cases it will be necessary to make certain modifications at the installation site.
How to make your own installation of the chimney will prompt the video.
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