Quote:
Originally posted by UnloadeD
Does the suction of the pump create a negative head on part of the system lowering the total amount of head?
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No.
Total head (aka total pressure) is measured as the difference between inlet pressure, and outlet pressure. The relative pressure i.e. atmosphere, is (almost) irrelevant, except for viscosity purposes (where applicable).
The pressure at the inlet can be negative, relative to the atmosphere (in other words, if you have a leak there, air will enter the rig, instead of water rushing out).