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<blockquote data-quote="wylekyote" data-source="post: 1915623" data-attributes="member: 4455"><p>Manual pumps should have a theoretical max head they are able to overcome, just like any other pump. A lot of it would be based on how fast you're able to cycle the pump (and for how long) though. A pump mechanically creates a pressure differential (low pressure = intake side, high pressure = "exhaust"/output side), where the output pressure is greater than the input pressure. The water you're trying to pump up your well is mainly fighting the effect of gravity (there are frictional losses in the pipe as well but they should be minimal in this situation), which becomes increasingly difficult as the depth of the well increases. This "head" or "pressure head" must be less than the maximum head of the pump (which for a manual pump, would be based upon the fastest maintainable speed you can actuate the pump).</p><p></p><p>So in short, yes they do have a depth limit. Beyond that, it can get complicated.</p></blockquote><p></p>
[QUOTE="wylekyote, post: 1915623, member: 4455"] Manual pumps should have a theoretical max head they are able to overcome, just like any other pump. A lot of it would be based on how fast you're able to cycle the pump (and for how long) though. A pump mechanically creates a pressure differential (low pressure = intake side, high pressure = "exhaust"/output side), where the output pressure is greater than the input pressure. The water you're trying to pump up your well is mainly fighting the effect of gravity (there are frictional losses in the pipe as well but they should be minimal in this situation), which becomes increasingly difficult as the depth of the well increases. This "head" or "pressure head" must be less than the maximum head of the pump (which for a manual pump, would be based upon the fastest maintainable speed you can actuate the pump). So in short, yes they do have a depth limit. Beyond that, it can get complicated. [/QUOTE]
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