Note: The velocity term can be ignored normally as it doesn't contribute significantly.
p(on_fluid_surface)absolute pressure on_fluid's_surface y = specific weight of fluid v(s) = velocity of fluid g = acceleration of gravity p(v) = vapor pressure h(e) = elevation from surface to pump h(l) = head loss
The sign convention for h(e) is positive when the fluid surface is above the pump and negative when below the pump's Center Line(CL).
Dropping the velocity term is common as it's almost always relatively small, not worth calculating, and yields a conservative result.
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