![]() For similar reasons I do not recommend suction strainers. I typically do not recommend foot valves for use on commercial and industrial self-primer applications. My experience is that foot valves add undesired friction and will leak or fail closed (or partially closed) at some point. A foot valve is in essence a check valve placed at the beginning (bottom) of the suction line. Some system designers will add foot valves to mitigate the prime time and strainers to preclude the introduction of solids into the pump. Best practices say to reduce priming time to a minimum. Every section of suction piping equates to a volume of air that must be removed when the pump starts. Prudent system design dictates that the suction pipe length be held to a minimum to promote long pump life. Usually 25 to 30 feet is the maximum recommended distance. Place the pump as close as possible to the suction source. The pump is too far from the liquid source. I normally caution users to limit their suction lift to a maximum of 25 feet due to factors such as fluid temperature (think vapor pressure), specific gravity, friction, system leakage, pump inefficiencies and elevation above sea level. ![]() The required lift is too high.Īt sea level in a perfect world, you can theoretically lift 65-degree water 34 feet with a self-primer. There can be several reasons for re-priming, one of the most common is evaporation of the fluid, and other reasons include leakage, pump movement and other maintenance related matters. Sometimes the pump will require manual re-priming after the initial prime.
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