Problems in gas pipeline design
Thread Content
For a user who consumes 200,000 cubic meters of gas per day and is located at a distance from the coking plant, what diameter pipe should be used to connect to the plant? Is it better to have pipelines overhead or buried? Flow rate: V = 200,000 m3/d = 2.315 m3/s. Selected flow velocity: u = 15 m/s. Cross-sectional area: S = V/u = 2.315/15 = 0.154 m3. Diameter obtained: D = 0.443 m = 443 mm. Selected flow velocity: u=10 m/s; cross-sectional area: S=V/u=2.315/10=0.232 m3; resulting diameter: D=0.544 m=544 mm. May I ask: In the table, a larger diameter corresponds to a higher flow rate, while a smaller diameter corresponds to a lower flow rate; yet the calculated results still fail to meet the requirements specified in the table. Why is that? Appendix: Allowable flow velocity for gas pipelines. Pipe diameter (mm) – Flow velocity (m/s): ≥800: 12–18; 2000: 7; 400–700: 10–12; 1000: 6; 300: 88. This table is taken from “Technologies for the Recovery of Coking Chemical Products”
Welded steel pipes with DN500 and a wall thickness of 6 mm can be selected. It’s better to choose a larger pipe size to leave some room for growth.
Whether it’s overhead or buried, don’t forget to consider the issue of condensate, hehe