Water pumps or more generically, suction pumps are used on sites for construction for the purpose of removing excess accumulated water or even for dewatering purposes. The heavy buildup of water often occurs due to accumulation of water due to high water tables as well as rains. The right suction pump can actually help move along the same while also reducing the downtime involved. Suction pumps or water pumps based on suction are generally used in these cases. Besides suction pumps, there are several other types of water pumps such as gas-power pumps, electric pumps, manual or hydraulic pumps.

Suction Pumps

Suction Pumps

The Modus Operandi

Suction pumps or water pumps are classified based on operational mode and are called positive displacement and centrifugal kinds. These design types are framed in ways to help move the water from an area to another—continuously. The centrifugal suction pumps use rotating impellers for movement of water into the pump and then form a pressure for discharging the flow. The suction pumps come in a number of different varieties that include trash, submersible and standard types. All types of liquids can actually get pumped with the use of centrifugal variants. This is applicable to even the thinnest of liquids and those with the least viscosity.

In case of positive displacement water pumps, the delivery of a fixed rate of water occurs via mechanical construction as well as expansion of flexible diaphragms.  These suction pumps are generally employed in industrial niches that use liquids of high viscosity. In addition, these are also used in places that need to handle sensitive solids. These pumps are naturally used for applications that require combinations of high pressure and low flow, at the same time!

Making the Right Purchase

When buying suction pumps or centrifugal pumps, you need to remember that they are used for several water system applications as well as construction systems. Mostly the centrifugal variants are used to pump water for building construction work and stand compatible with the pneumatic modes or systems that need no special suction lift mechanism.

Most centrifugal pumps are used to pump out from wells and for boosting pressure in case of intake lines. These can serve as a constant pressure source when it comes to fire protection setups and also as sump pumps in configurations of vertical/horizontal types.

Suction pumps are exposed to certain common problems. These need liquid that re-circulates to handle the overheating issues that might arise. The latter is an issue triggered by low flow, in the most usual cases. In case of centrifugal pumps, there must be constant filling up with fluid for seamless operation. The process is called priming.

In case of positive displacement pumps, which are also called rotary pumps, efficiency levels are higher since these work by removing air and then eliminate the need for bleeding the same. Such pumps are very effective for handling highly vicious liquids.

The main drawback for the positive displacement pumps in the suction pumps category is these need highly small clearance between the outer unit edge and the rotating pump.

Thanks to this, the rotational speed must be really slow. In case the water pump sees operations at peak speeds, liquids might just erode and finally reduce the overall efficacy of the water pump.

Finally, you need to remember that there are a number of factors that are essential when considering the kind of suction pumps, or water pumps generally, to purchase-

  • Flow rate

  • Horsepower

  • Materials needed for applications

  • Type of operating mechanism

Overall head discharge apt for the application intended etc.

About the author

Layla FInn

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