EIDW

Well Point Dewatering system

A well point system consists of a number of wellpoints spaced along a trench or around an excavation site which are all connected to a common header that are attached to one or more wellpoint pumps. Wellpoint assemblies-are made up of a wellpoint, screen, riser pipe, and swing joint with tuning-and are generally installed by jetting. They provide for entry of water into the system by creation of a partial vacuum. The water is then pumped off through the header pipe.
A wellpoint pump is a combination of two pumps, one of which pumps water from the header and the other of which is a vacuum pump to remove air which enters the system. Control of air is important, as excessive air causes cavitations, which reduces pump efficiency.

  

EIDW dewatering pumps are designed specifically for the dewatering function. They are available in capacities from 500 to 2 000 gallons per minute.

Wellpoint systems are frequently the most logical and economical choice for dewatering construction sites where the required lowering of ground water level is approximately 20 feet or less. However, greater lifts are possible by lowering the water in two or more stages.

The 20-foot lift restriction results from the fact that the water is lifted by difference between ambient air pressure and the lowered pressure created by the pump.