Understanding Gravity-Flow Pipelines
can have specific pipe sizing requirements (see Negative Pressure, next page). Example 2 – Combination Pipe Sizing Using the same conditions as Example 1, (75 feet elevation head, using 1200 feet of 1 inch polyethylene pipe supplying a trough), but instead of free flowing, a trough pressure of 15 psi is required, as shown in Figure 1.
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