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Pumps must be able to move a high volume of water, pass debris without clogging, and withstand difficult conditions on any jobsite. Photo: Multiquip Inc.
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    Types of pumps

Storm delays can result in substantial costs. But the diversity of pumps available makes them ideal for residential, commercial, and industrial applications—from basement and landfill dewatering to wastewater treatment facilities and food-processing plants.

Municipalities want value. They need durable pumps that can move high volumes of water quickly without clogging.

Pump performance is measured in gallons per minute (gpm) and in pressure as head. Head is the gain (or loss) in pressure caused by gravity (vertical rise of the discharge hose) and friction as water moves through the system. Most often it is listed in product specifications as feet of water.

“Municipalities will use a variety of pumps because they'll be for different applications,” says Steven Spence, pump product manager at Multiquip. A few simple questions will help in choosing a pump:

  • What is the nature of the liquid?
  • What is the application?
  • Is a specific flow required?
  • Is hose or pipe (steel or PVC) being used for the discharge?
  • What is the vertical lift from the surface of the water?
  • What is the length of the discharge?
  • Is there any vertical rise in the discharge hose?

Which Pump Does What

The following are descriptions of the different types of available dewatering pumps (Click here to see which pumps work best for specific applications).

Standard centrifugal pumps are economical for general purpose dewatering. Most common are 2- to 4-inch models with flows from 142 to 500 gpm and heads from 90 to 115 feet. These pumps should be used only in clear water applications because they have a limited solid handling capability: spherical solids one-quarter the diameter of the suction inlet. One advantage over comparably sized trash models is their low initial cost and lighter weight.

High-pressure centrifugal pumps are for applications requiring high-discharge pressures and low flows such as washing down equipment on the jobsite. Other uses include irrigation, water trailers, and emergency firefighting.

High-pressure centrifugal pumps typically discharge around 145 gpm and produce heads in excess of 300 feet.