The impact of intermediate diameter changes in continuous diameter variation on gas usage by end-users
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Our facility has a natural gas distribution station; the inlet pipe has a diameter of DN150 and a pressure of 0.7 MPA. From the main pipeline, branches are created for pressure regulation and diameter adjustment – the diameters of these branches become DN250, DN200, and DN250 respectively, with the pressure dropping to 0.3 MPA. At the end, these branches connect to the users’ systems, where the pipe diameters are DN50, DN80, and DN100, again at a pressure of 0.3 MPA. What impact would it have on the end-users if the diameter at that intermediate stage were changed to DN150?
It shouldn’t affect end-users, right? If it comes to comparing pressure and flow rates, it might be rather troublesome
The diameter of the intermediate section is DN150, while the diameters available at the user end are DN50, DN80, and DN100. The DN150 diameter is larger than those of the user-end pipes, ensuring that the gas flow requirements can be met at the user end; the intermediate section also meets these requirements； If the pressure at the user end falls below the required 0.3 MPa due to the reduction in diameter in the intermediate section, the pressure at the inlet of that intermediate section can be increased slightly – to a level just above 0.3 MPA – which will meet the requirements without having any significant impact on the entire piping system.