Calculation of gas supply systems of cities

Contents

1. INPUT DATA

2. POPULATION DEFINITION

3. DETERMINATION OF ANNUAL HEAT EXPENDITURE

3.1. DETERMINATION OF ANNUAL HEAT CONSUMPTION AT GAS CONSUMPTION IN APARTMENTS

3.2. DETERMINATION OF ANNUAL HEAT CONSUMPTION DURING GAS CONSUMPTION AT CONSUMER SERVICE ENTERPRISES

3.3. DETERMINATION OF ANNUAL HEAT CONSUMPTION AT GAS CONSUMPTION AT CATERING FACILITIES

3.4. DETERMINATION OF ANNUAL HEAT CONSUMPTION AT GAS CONSUMPTION IN HEALTH CARE INSTITUTIONS

3.5. DETERMINATION OF ANNUAL HEAT CONSUMPTION DURING GAS CONSUMPTION AT BAKERIES AND BAKERIES

3.6. DETERMINATION OF ANNUAL HEAT CONSUMPTION FOR HEATING, VENTILATION, HOT WATER SUPPLY OF RESIDENTIAL AND PUBLIC BUILDINGS

3.7. DETERMINATION OF ANNUAL HEAT CONSUMPTION IN GAS CONSUMPTION FOR THE NEEDS OF SCHOOLS AND KINDERGARTENS

3.8. COMPILATION OF THE TOTAL TABLE OF GAS CONSUMPTION BY THE CITY

4. DETERMINATION OF ANNUAL AND HOURLY GAS EXPENDITURES BY DIFFERENT CITY CONSUMERS

5. SCHEDULE CITY ANNUAL GAS CONSUMPTION

6 . SELECTION AND JUSTIFICATION OF GAS SUPPLY SYSTEM

7. DETERMINING THE OPTIMAL NUMBER OF GRS AND GRS

7.1. DETERMINATION OF THE NUMBER OF GCPS

7.2. DETERMINATION OF OPTIMAL NUMBER OF GRP

8. SELECTION OF GAS CONTROL STATION AND PLANT EQUIPMENT

8.1.SELECTION OF PRESSURE REGULATOR

8.2.SELECTION OF SAFETY SHUT-OFF VALVE

8.3.SELECTION OF SAFETY RELIEF VALVE

8.4.FILTER SELECTION

9. HYDRAULIC CALCULATIONS OF GAS PIPELINES

9.1. HYDRAULIC CALCULATION OF HIGH AND MEDIUM PRESSURE RING NETWORKS

9.1.1. Calculation in emergency modes

9.1.2 Calculation of branches

9.1.3. Calculation for Normal Flow Distribution

9.2.HYDRAULIC CALCULATION OF LOW PRESSURE GAS NETWORKS

10. HYDRAULIC CALCULATION OF LOW PRESSURE DEAD END GAS PIPELINES

BIBLIOGRAPHIC LIST

1. Source Data

1. City District Plan - Option 6

2. Construction district - Irkutsk

3. Population density - 190 people/ha

4. Gas coverage - 100%

5. Proportion of population (%) using:

- cafes and restaurants - 15%

- baths and laundry - 10%

6. Load on the enterprise -

7. Initial pressure in the annular gas pipeline - 0.5 MPa

8. Final pressure in the annular gas pipeline - 0.25 MPa

9. Initial pressure in low pressure network - 5 kPa

10. Allowable difference in low pressure network - 1kPa

6 . Selection and justification of gas supply system

Gas supply systems are a complex complex of structures. The choice of the gas supply system of the city is influenced by a number of factors. These are, first of all: the size of the gasified territory, the features of its layout, population density, the number and nature of gas consumers, the presence of natural and artificial obstacles to the laying of gas pipelines. When designing a gas supply system, a number of options are developed and their technical and economic comparison is made. For construction, the most profitable option is used.

The gas supply systems of the city consist of the following main elements: high, medium and low pressure gas networks, gas distribution stations, gas control points and installations, various structures on gas pipelines. The gas networks of the city are designed taking into account the prospects for its development for the next 25 years.

Depending on the maximum gas pressure, city gas pipelines are divided into the following groups:

- high pressure of category 1 with pressure from 0.6 to 1.2 MPa;

- high pressure of category 2 with pressure from 0.3 to 0.6 MPa;

- average pressure from 5 kPa to 0.3 MPa;

- low pressure up to 5 kPa;

High and medium pressure gas pipelines serve to supply medium and low pressure urban distribution networks. Low-pressure gas pipelines are used to supply gas to residential and public buildings, as well as to consumer services, catering, medical institutions, etc. Low-pressure gas pipelines are fed through gas control stations (GRP) from high and medium pressure networks.

According to the number of pressure stages used in urban gas networks, they are divided into:

- two-stage, consisting of high or medium pressure and low pressure networks;

- three-stage, including high, medium and low pressure gas pipelines;

- multistage, in which gas is supplied through gas pipelines of high pressure, medium and lower pressure.

The choice of the gas supply system in the city depends on the nature of gas consumers who need gas of the appropriate pressure, as well as on the length and load of gas pipelines. The more diverse the gas consumers and the greater the length and load of the gas pipelines, the more complex the gas supply system will be.

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