Pipeline merging
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What size pipeline is equivalent to two DN300 pipelines?
Cross-sectional area = πr^2, or = 1/4πd^2. Since d^2 = 2*300^2, we have d^2 = 180000; therefore, d = 424. Using the standard pipe diameter values, when two DN300 pipes are combined, the pipe required might be of DN450 size. However, the selection of the pipe diameter ultimately needs to be determined based on the allowable range of flow velocities. Suppose that for a pipe with a diameter of DN300, the calculated range based on the flow velocity requirements is between DN250 and DN300; then, when two DN250 pipes are combined, the minimum required diameter should be at least d=354. Therefore, the resulting diameter for two DN300 pipes combined should be DN400 or DN450.
Based solely on area, it is 1.414 times. Based on the flow rate, a verification is required. Operational considerations also need to be taken into account; if the two pipelines are not used simultaneously, then there is no need to change the diameter after merging them.