Gas supply of Makhachkala city

Contents

1. Introduction

2. Source Data

3. Determination of the lowest combustion heat of gas and

combustion density of gaseous fuel

4. Determination of population number

5. Determination of annual gas consumption

6. Calculation of gas consumption modes

7. Determining the maximum hourly flow rate of gas by consumers and determining the method of connecting consumers to gas networks

8. Determination of FRG quantity

9. Selection of pressure regulators of FRG

10. Hydraulic calculation of medium pressure gas network

• Hydraulic calculation of the 1st emergency mode of operation of the medium pressure gas network

• Hydraulic calculation of the second emergency mode of operation of the medium pressure gas network

• Hydraulic calculation of normal operation mode of the medium gas network

pressure

• Hydraulic calculation of branches, normal operation mode of medium pressure gas network

11. Calculation of low pressure gas networks

12. Hydraulic calculation of low pressure gas network

a) Calculation of low pressure intra-quarter gas networks

b) Hydraulic calculation of low pressure intra-quarter gas networks

c) Calculation of low pressure internal gas networks

d) Hydraulic calculation of intra-house gas networks of low pressure

13. Chimney calculation

14. Literature

1. Introduction:

The scale and pace of development of the gas industry and gas supply systems determines gas production, according to which the Soviet Union, and now the Russian Federation, ranks first in the world.

In the main directions of economic and social development of the USSR for 1986 - 1990 years and for the period up to 2000 year, it was planned to increase gas production in 1990 year to 835... 850 billion m3, accelerating development. Further expansion of gasification of cities was planned.

Improvement, intensification and automation of technological processes led to the need to improve the quality of consumable heat carriers. Natural gas meets these requirements most than other fuels.

Rational use of gaseous fuel with the greatest realization of its technological advantages allows to obtain an economic effect, which is associated with increased efficiency of units and reduced fuel consumption, easier regulation of temperature furnaces and installations, as a result of which it is possible to significantly increase the intensity of production and the quality of the obtained products. The use of gas for industrial installations improves working conditions and increases its productivity. The use of natural gas in industry makes it possible to carry out fundamentally new, progressive and cost-effective technological processes. In addition, the use of gas as fuel makes it possible to significantly improve the living conditions of the population, increase the sanitary and hygienic level of production and improve the air pool in cities and industrial centers.

Gas distribution systems have become unified for regions and republics, and their design, construction and operation require deep knowledge of specialists. The growth of gas consumption in cities, towns and rural areas, as well as the scale of distribution systems, pose new and difficult tasks for the gas engineer related to the development and reconstruction of systems, improving their reliability, the need for economic use of gas and protecting the air basin from pollution. The solution of these problems is possible only with the use of computer technology.

Distribution systems are complex multi-ring systems, the economic design of which should be based on modern optimization methods, taking into account the probabilistic nature of operation and ensuring the required reliability of gas supply to consumers. Therefore, the calculation methods of the system, described in the textbook, are based on modern ideas about the random processes of gas consumption and the functioning of system elements and the use of mathematical optimization methods. The above methods are illustrated by specific calculation examples.

The beginning of the development of gas growth in the Republic of Moldova has been considered since 1946, when the first plant consuming gaseous fuel was brought to the territory of the Republic and installed. This unit consisted of a gas plate and a liquefied hydrocarbon gas cylinder. With the advent of this type of fuel, there was a need to create organizations that would deal with the operation and technical supervision of such installations. In this regard, gas cantors were initially organized in the republic, and after that, as development and development grew, the Republican Gasification Association was organized. Since 1969, tank plants have appeared in the republic to supply consumers with liquefied gas, allowing them to supply multi-storey residential buildings or groups of residential buildings with uniform gas fuel. The first such installation was installed in the sector of Stalin's Botany in 1950. To supply these plants, in the same year the first Moldavian gas filling station was built in the village of Gidigich.

Since 1967, natural gas has been supplied to the republic through the Sebelinsk Odessa Chisinau main gas pipeline.

Currently, in the Republic, the gas supply industry is led by Moldovagaz, a Moldovagaz concern, before the organization of this company.

Now, only on the territory of the right bank of the Dniester, 593.5 km of main gas pipelines and 599.7 km of gas pipelines of the main gas transport sectors are operated, they include 66 gas distribution stations, 3 gas compressor stations with natural compressed gas.

For gas supply, as a rule, dry gases are used. The main task in designing the gas supply system of the city is its reconstruction and development, respectively, the development of the city and industry in it.

In solving this problem, first of all, it is necessary to find out a new gas load for the future, depending on the scheme for the reconstruction of urban buildings, make decisions on their heat supply, hot water supply and the degree of their quick maintenance:

1. Low pressure gas pipelines with a pressure of 5 kPa (500 mm water. Art. Excessive);

2. Medium pressure gas pipelines with pressure from 5 kPa to 0.3 MPa (up to 3 kgf/cm2 excess);

3. High pressure pipelines of III category with pressure from 0.3 to 0.6 MPa (from 3 to 6 kgf/cm2 excess);

4. High-pressure pipelines of the I category for natural hag and gas-air mixtures from 0.6 to 1.2 MPa (from 6 to 12 kgf/cm2 excess);

The distribution system grew, at the end of 2004 it amounted to 10,835 km of gas pipeline, of which 387 km of high-pressure gas pipelines, 1,554 km of medium-pressure street gas pipelines and 5,493 km of yard and intra-apartment low-pressure gas pipelines. 329 km of Gas Regulatory Points (GRP) and 7962 km of Cabinet Regulatory Points are constructed and operated on these gas pipelines. Gas consumption in the Republic of Moldova is 1.2-1.3 billion m3 annually. All gas consumed in the Republic is imported from the Tyumen region .

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