Selecting and sizing pumps

Booster set sizing in four steps: peak simultaneous flow, head at the index outlet, pump count and control mode, plus why margin stacking oversizes most sets.

A borehole pump is a multistage submersible cooled by the water it moves. How the stages make head, and how to size against the pumping water level.

A cold water booster set holds a building at a set pressure using several pumps under one controller. How the tank, pumps, controller and vessel each work.

A shoe squeezes a hose flat and carries the trapped slug to the discharge. How the occlusion, the hose recovery and the vacuum work, and what that costs you.

Two lobed rotors counter-rotate and never touch. How a rotary lobe pump works, when to move off a centrifugal, and what kills one in service.

A submersible rated S1 continuous has no time limit underwater. What limits it is cooling, starts per hour, depth, seal condition and the medium.

Dry running burns through the stator and takes the rotor with it. What keeps a progressive cavity pump alive: suction, speed, elastomer and seal.

Cavitation is a suction-conditions fault. Fix the suction side first, then the duty point, then the pump, and learn to tell it apart from air entrainment.

How to read the head–flow, efficiency, power and NPSHr lines on a pump performance curve, place your duty point, and stay off the end of the curve.

What EHEDG certification, 3-A Sanitary Standards, food-contact law and Ra surface finish each cover on a hygienic pump, and what they leave to you.

A submersible pump run dry usually loses its mechanical seal. What fails, how it differs by pump type, and why the cause sits on the suction side.