Gas integrated boiler room. Gas supply design
We have carried out a comprehensive design of an integrated gas boiler for an administrative turnkey two-story building. Developed sections outdoor gas supply.
In this article, I propose to become familiar with the design of domestic gas supply.
Gas supply system design
2.1. Decisions on setting fuel limits
Natural gas is used as fuel for the designed boiler house in the administrative building of the Department of the Federal Pension Fund of Russia.
2.2. Gas supply source
Gas supply to the boiler house is carried out by low-pressure natural gas with Q = 8000 kcal / m 3 (34.74 MJ / m 3) from the existing gas pipeline.
2.3. Type and number of installations
Gas consumers are:
- boiler gas water-heating Valiant atmoTEC plus VU280 / 5-5 thermal power of each boiler is 31.1 kW
Installed power boiler 62.2 kW.
2.4. The need of the object in the gas.
Technical solutions for accounting and control of gas consumption
Gas consumption - 6.6 n. m 3 / h Gas meter BK-G6 (T) is provided. A gas filter can be installed in front of the meter.
2.5. The system of automatic control and control of thermal processes
The automation system provides for the operation of the boiler house without the constant presence of maintenance personnel. Automatic regulation provides for automatic operation of the main and auxiliary equipment of the boiler house, depending on the set operating parameters and taking into account the automation of heat consuming installations. Automatic shutdown of gas supply at the input to the boiler room is provided for:
- deviation of gas pressure in front of boilers;
- fire;
- the disappearance of the supply voltage.
2.6. Methods for controlling the temperature and composition of gas combustion products
The flue gases are removed from the boilers through the chimneys into individual chimneys for each boiler with insulation DN 130.
2.7. Electrochemical corrosion protection devices for steel pipelines
The gas pipeline is made of water and gas pipes according to GOST 3262-75 *. After installation, paint the internal gas pipeline with MA-02 enamel of yellow color twice in GF-021 primer.
2.8. Measures to ensure the safe operation of gas supply facilities
The boiler room provides for the installation of easily discharged structures at the rate of SOST = 0.03 m2 x VPOM m3. The boiler room provides natural and electric lighting. Protect gas equipment from unauthorized access inside. Equip a boiler room with fire extinguishing equipment in accordance with technical regulations on fire safety requirements.
For arc welding, apply electric arc and gas welding. Threaded and flanged connections are allowed only in the installation of valves and disconnecting devices. The quality of welded joints should ensure its equal strength with the base metal. Types, structural elements and dimensions of welded joints of steel gas pipelines must comply with GOST 16037 - 80.
The pipeline in the room to lay openly and at the intersection of the walls is enclosed in cases. The gaps between the gas line and the case should be sealed with an elastic material (tarry heel). The fastening of the gas pipeline to the building structures should be provided for in series 5.905-18.05 of the following issue.
Before firing the burner, shut-off valves should be checked for tightness of the valve by means of test pressure testing of the pipeline with a pressure of 0.01 MPa. The pressure drop should not exceed 0.0006 MPa in 1 hour.
A gas indicator is installed in the boiler room, equipped with a remote sensor for methane and a built-in sensor for CO. The indicator when the concentration of the above gases reaches 10% of the NKPR gives a signal to close the high-speed shut-off valve installed on the gas pipeline to the boiler room;
The boiler room is provided with a waterproofing device designed for a bay height of up to 10 cm and a threshold at the entrance door;
The boiler room is equipped with general ventilation, which provides a three-time air exchange;
The project provides for a purge gas pipeline;
Before testing for tightness, the internal cavity of gas pipelines must be blown through with compressed air to remove scale, moisture, and clogging.
Standards test gas tightness:
- Low pressure gas pipeline of the boiler house up to 0.005 MPa - with a pressure of 0.01 MPa for 1 hour.
The gas equipment (technical devices) and materials used in the project are certified for compliance with safety requirements and are approved for use by the Gosgortekhnadzor of Russia.
Installation and testing lead in strict accordance with SNiP 42-01-2002 and SP 42-101-2003.