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Pressure drop calculation
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Engineering notes that sit next to the solvers — friction, networks, pumps, and transients.
Series adds head at the same flow. Parallel adds flow at the same head. How to intersect a quadratic system curve and when unequal pumps idle.
Discharge is set by the drop between free surfaces, not by the hump. Crown vacuum, priming, practical 7–8 m lift, and the same physics as NPSH.
Elbows, valves, and entrances are not minor on a short suction line. Sum K, convert to L_eq, expansion/contraction, and when a control valve should be Cv.
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