How do I figure a pump’s “head” or pressure output?

 Head produced by a pump is the difference between suction pressure and discharge pressure plus  the difference in velocity heads (sometimes negligible) typically represented as feet differential.

h = (Pd – Ps) + (Vhd – Vhs)

Pd= PSI discharge pressure needs to be converted to feet Ft = 2.31 (psi)

                                                                                         SG

Ps= PSI suction pressure (needs to be converted to feet)    Ft =2.31(psi)

                                                                                         SG

Vhd = velocity head discharge = V² where V is the velocity in the pipe and “g” is gravity                                              2g                                                        (typically 32.2ft/sec²).

Vhs = velocity head suction = V²   where V is the velocity in the pipe and g is gravity

                                           2g                                                           (typically 32.2ft/sec²