Gas supply of the quarter

Contents

1. Design Input

2. Characteristics of the design facility and gas consumers

3. Determination of gaseous fuel properties

4. Determination of the number of network GRP

5. Determination of gas consumption by city consumers

6. Selection of the city gas supply system

7. Hydraulic calculation of medium (high) pressure ring

8. Hydraulic calculation of low-level distribution network

pressure

9. Internal gas supply device

10. Hydraulic calculation of internal house gas pipelines

11. Burner calculation

12. Selection and calculation of equipment for GRU of the quarterly boiler house

List of literature

Selection of the city gas supply system

When choosing the gas supply system of the city, a number of factors should be taken into account. We accept a two-stage gas supply system with a pressure in the first stage of 0.6 (0.3) MPa, in the second - 3.0 kPa. The use of a high pressure of 0.6 MPa instead of an average is not always possible due to the need to withstand much longer distances to buildings and underground structures.

A single-stage gas supply system is inexpedient, as it will lead to a significant increase in the cost of the low-pressure network. The use of a three-stage system is also impractical: there are no large gas consumers outside the city; the high pressure country ring will duplicate the medium pressure ring and significantly increase the cost of the network.

The medium (high) pressure network is designed ring. Such a two-way power network is quite reliable. The ring route is selected to reduce the total length of the medium (high) pressure network.

Low-pressure gas pipelines from GRP are laid inside neighborhoods and microdistricts along the shortest path, i.e. from the condition of minimum network length. Low pressure networks are designed mixed with ring only main lines.

Since the need for gas is small, we accept the bottom of the GDC. The gas distribution station is located in the north-east of the city at a distance of 0.36 km from the development line.

Internal gas supply device

Gas enters residential buildings through gas pipelines from the city distribution network. The building gas supply system consists of inlets supplying gas to the building and internal networks that transport gas inside the building and distribute it between individual gas meters. In residential buildings, only low-pressure gas is allowed: for natural gas - up to 3 kPa.

In apartment buildings, separate entrances are made to each section and risers are installed to distribute gas to the floors. Gas pipelines are introduced into buildings through non-residential rooms (staircases, corridors, kitchens) available for inspection of pipes. A disconnecting device is installed at the gas pipeline entry into the building.

Gas pipelines in residential buildings are laid on non-residential premises. Risers can be placed in staircases or kitchens. Laying of gas pipelines risers in residential premises, bathrooms and sanitary units is not allowed. It is impossible to lay gas pipelines through ventilation ducts, elevator shafts, garbage collection rooms, chimneys.

Disconnecting devices are placed in staircases, vestibules and corridors. Gas pipelines are laid openly. At the crossings of building structures they are enclosed in cases.

Gas stoves are installed in kitchens not less than 2.2 m high, having a window with a window (frame) and an exhaust ventilation channel. At the same time, the internal volume of the kitchen should be at least: for a gas stove with two burners -8 m3; for a plate with three 12m3 burners; for a four-burner plate - 15 m3 [1, 17].

In case of gas supply of apartment buildings, gas consumption is taken into account in apartment buildings. The selection of the meter is determined by the maximum gas consumption of the installed devices .

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