Requirements for chimneys of gas boilers. Requirements for the installation of a coaxial flue gas boiler. Fire safety

The chimney protruding above the roof is only a visible part of the chimney design, which ensures the removal of harmful elements - smoke and gases. The operation of any system for the discharge of combustion products must be strictly in accordance with the fire safety technique.

Conditions for the use of gas fired boilers

Reliability and safety of the use of the heating system are entirely in the care of the owner of the house or cottage. Requirements for chimneys of gas boilers are designed to prevent accidents. To install the boiler in full compliance with all requirements, it is necessary to take into account the type of boiler and fuel, to know the design features of the chimney in the house.

To solve the problem of diverting combustion products, the owner of the house can apply to specialized shops. In order for the installed system to be operated as efficiently and safely as possible, it is important to understand the general operating principles of the boiler of the corresponding variety, its advantages and disadvantages, strengths and weaknesses. Then it is necessary to thoroughly study the requirements for chimneys of gas boilers to avoid irregularities and prevent extraordinary situations.

Modern varieties of chimney systems

Self-assembly of the chimney is a feasible project, although a qualified specialist consultation will never interfere. To date, there are the following models of boilers:

- classic made of bricks;
- metal made of stainless pipes;
- coaxial, with a specific anti-condensate form.

Mounting Features

Installation of a flue gas boiler, the requirements for which satisfy all the design parameters, is usually carried out under the strict supervision of specialists. In this case, all the necessary measurements will be made, the quality of the work will provide the house with a reliable chimney system that has been operating for many years.

Specificity of different types of devices

I must say that the traditional brick chimney is not just irrelevant in terms of design, but it is already outdated and technically. This is a rather complex structure, which is expensive for all parameters - from masonry, materials, to the time spent. Weak performance and minimum convenience in cleaning, low level of harmful substances make it the most unpopular option.

Boilers made of stainless steel can offer a fairly wide range of models, they are wear-resistant and easy to operate. Typically, the device is a so-called sandwich system, where one tube is embedded inside the other. The air gap between the pipes is filled with cotton wool from basalt, which provides heat resistance. This is a simple and successful solution for the removal of smoke and gas waste.

Coaxial chimney

It has a high external presentability and a decent level of technical parameters. The specific shape ensures a smooth distribution of the condensate and its mass output. This quality is very important for gas fuel systems.

How to choose a chimney for a gas boiler? Requirements, photos

Consider the general requirements for the procedure for installing boilers. Selecting the optimal device for the discharge of smoke and starting to install it, you should carefully read the safety rules for each version of the system. Chimney for a gas boiler, the requirements for which are set out in building codes and regulations, is established with the appropriate standards:

- The pipes are located inside the building and its main wall (external chimney requires additional insulation);
- the location of the system is vertical, the slope does not exceed 30 degrees, without extensions and constrictions;
- the cross-sectional area does not exceed the sectional area of the gas equipment;
- connection with the boiler is carried out through corrugated or stainless pipes with heat-resistant coating (enamel, etc.);
- the pipe should protrude outward by at least 50 cm, the number of turns does not exceed three;
- the joints are tightly sealed;
- horizontal parts of pipes in rooms with a height of 3 m do not exceed the length of 3 m;
- the slopes of pipes towards the boiler can not exceed 0.1 degree;
- a special container with a cleaning window located below the entrance of the flue gas duct into the channel is installed to collect the condensate;
- any deflection of the pipe in the connections is excluded;
- the distance between surfaces and heat-resistant materials is not less than 5 cm, and between inflammable - from 25 cm;
- the chimney located on the roof is not more than 1.5 m away from the roof ridge; If it is removed to a distance of up to 3 m, it is set flush with the ridge;
- on a flat roof, the chimney must rise no less than 1 m. Requirements for chimneys of gas boilers include a number of strict limitations, which are also important to comply with all who have at their disposal these systems.

What is prohibited during installation?

The procedure for installing outlets excludes a number of potentially dangerous moments. Chimney for a gas boiler, fire safety requirements to which are described in the SNiPs, include the following restrictions:

- all channels can not be made of porous materials, slag concrete (the best option is stainless steel, which can be combined with a brick shaft made of one-and-a-half walls);
- No smoke pipes pass through living quarters, closed loggias or poorly ventilated areas of the house;
- it is forbidden to put nozzles on top of gas appliances;
- there can be no connections in the chimney inside the floors;
- non-insulated pipes are not placed outside - the formation of condensate will disrupt the operation of the boiler and may exceed the capacity of the collector;
- pipes can not be laid near flammable materials - it is necessary to use thermal insulators, and in the interstorey areas - plates to protect from fire.

The requirements for chimneys of gas boilers are quite achievable, the entire production line for the production of modern models of these devices is aimed at this.

Standards of installation of brick system

A brick chimney for a gas boiler, the requirements for which is much higher, is constructed within the following rules:

- arrangement of such chimney is made at a time with the walls of the house according to one principle, regardless of the way of using its channels - external or internal;
- such a chimney needs a solid foundation, which can be built from both reinforced and simple bricks;
- when designing the foundation, it must be taken into account that its height can not be lower than 3 m, and the width must be 1.5 m or more behind the chimney contour;
- tightness in the chimney is maintained;
- the internal surface is smooth, special patterns are used in the construction process;
- the thickness of the partitions between the channels must be at least 120 millimeters (half-brick), in the ventilation ducts - half as much;
- at the end of the chimney is placed a head of reinforced concrete, the edges of which extend beyond the range of 100 millimeters;
- the outlets of the ventilation ducts are created under this head, which will prevent blowing of air (the dimensions of these openings can not be less than that of the channel).

Basic requirements for a brick chimney

This type of chimney has won the trust of users due to numerous advantages:

- high level of efficiency, which is ensured by a good warming of the air mass;
- compactness - one pipe instead of two massive ones;
- ventilation is not needed;
- ecological compatibility of the whole system;
- air safety in the boiler room - the device takes another oxygen supplied by a separate channel;
- low cost of the discharge system;
- there is no problem with condensate outlet;
- low fuel consumption for bath needs;
- Protecting the walls from overheating due to a good supply of cold air.

Installation of a coaxial chimney

Coaxial type of gas elements are built inside gas convectors, radiators with closed combustion chambers.

The basic requirements for installing a coaxial flue gas boiler include the use of the following elements:

- the knee;
- a pipe for a chimney;
- flange;
- boiler adapter;
- Crimp clamp.

In general, the requirements for chimneys of gas boilers (SNiP) of coaxial type are lower than those for the rest, conventional.

This type of device is placed near the boiler and the wall - from the circumferential zone, all hot-melt and heat-resistant materials should be removed. It is important to accurately calculate the outlet of the pipe outside - it is placed 1.5 m above the boiler element. The hole is made in diameter 110-125 mm, which coincides with the pipe. Requirements for the coaxial flue gas boiler are observed during the installation and ensure the safety standards of residents.

Construction rules and regulations for installation

Building codes and regulations detail the process of cleaning chimneys and ventilation ducts. The primary and secondary checks are carried out, in case of violations, the system is dismantled. The owner can be deprived of a construction license or brought to administrative responsibility. Traditional cleaning of chimney systems from soot and carbon deposits is carried out before the start of the heating season. On average, the cleaning procedure should be organized at least once a quarter. Heat resistant designs are cleaned once a year.

Flue system inspection procedure

Regular check of the condition of the chimneys ensures the safety of the tenants. There are several stages of verification. Primary includes the following procedures:

- determination of the literacy of the use of all smoke and combustion products;
- detection of blockages;
- study of all partitions protecting unstable to heat structures;
- measurement of distances and their compliance with standards;
- serviceability of the whole system;
- measurement of thrust, etc. If necessary, a secondary audit is carried out, appropriate recommendations are made and sanctions are imposed in case of violations.

So, we have found out the features of the installation of chimneys. Successful construction!