What is the pressure in the main urban natural gas pipeline?
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What is the typical pressure in urban natural gas main pipelines? What is the pipe diameter? (It does not refer to the pressure before entering the residence, but rather the pressure in the main pipeline at the moment of entering the city.)
The size of a town is related to the number of users; the pressure in the natural gas main pipelines is generally between 0.2 Mba and 0.4 Mba, with pipe diameters ranging from DN500 to DN100. It depends on the situation.
Okay, thank you. But I checked and the pressure in the main pipeline is still 4 MPa
It depends on what kind of “main pipeline” you are. . . . There are many types of natural gas transmission pipelines in urban areas; some operate at pressures below 1.6 MPa, while others operate at pressures above 1.6 MPa. According to the design standards for urban gas systems, the pressure in gas pipelines in Zone 4 should not exceed 4.0 MPa. In the case of gate stations and gas storage stations, such as those connected to the main pipelines transporting gas from the west to the east, the pressure is even higher – values exceeding 8 MPa are not uncommon. Large cities typically have numerous gate stations and gas storage stations, resulting in quite complex pipeline systems. . If it is for the collection of design materials, it is recommended to refer to the Gas Design Code GB 50028. .
Okay, thank you. I’ve seen that national standard before, but I couldn’t find the standards regarding the pressure of the main pipelines – that is, the pressure of the main pipelines upon entering the city – as well as the pipe diameters
The pressure you are referring to is the pressure at the outlet of the pressure regulation station, not the pressure in the main pipeline; here, the pressure in the main pipeline is at least 1 MPa or higher