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Typically, the piping should be sized large enough so that frictional pressure drops within the piping system make up less than 10% of the operating pressure of the system. For example, a system operating at 100 psi should have less than 10 psi of frictional pressure losses in the piping system. Pressure losses in a piping system can be readily determined using the “equivalent length” method that is found in most piping handbooks. Since most piping systems are not complex, we have developed over the years a simple rule of thumb for sizing the piping. We generally recommend 5-10 feet per second in the supply pipe and 3-5 FPS in the return pipe.
Source: Dry Coolers