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The water level can drop by pumping from the reservoirs, ditches and other sources that are open to the atmosphere the surface of the liquid, or by evacuation of soils with special tubular filter elements (well point), submerged in the ground. During expansion dewatering used two types of well point. In the first one well point is a PEX pipe, affixed to a manifold expansion dewatering installation, located on the ground. Such well point of lowering the water level in the soil to a depth of 7-8 m, which is determined by the expansion created by the installation of dewatering. If necessary, dewatering to a greater depth are used well point with a built in these hydro-jet machine. Such well point were called ejector. Ejector well point has two connecting pipes. The first of them supplying a working water supplied to the active Taco pump nozzle. With the help of the second tube is given a mixed stream after the Taco 007 flow check circulator pump (operating water and water pumped from the ground).
As the expansion dewatering and dewatering plants in recent years have found wide application circulation systems with centrifugal pumps and hydro. In these installations Taco 007 pump, taking water from the circulation tank, submits it to the nozzle hydro system, which creates the necessary suction and drain water from the drained volume. Moreover, for drainage, as a rule, use the facilities in which water is pumped by one jet apparatus. Last, if necessary, transports and air penetration into the intake manifold or released from the water.
In some cases, dewatering units have two or more jet apparatus for independent pumping water and air quality due to the fact that the air content in pumped out of the soil mixture can exceed the volume of pumped water. In systems with ejector well point built hydro unit is designed for joint air exhaust and water. Drainage and dewatering systems can work, or only on suction (water is discharged after evacuation by gravity), or as the suction and pumping at. The need for the latter case occurs if the water pumped to clear the need to raise to a certain height (in deep pits, mines, etc.).
Feature of the operating modes of the expansion dewatering and dewatering facilities is the need to establish and maintain a process of significant expansion (absolute pressure of 0,1-0,2 MPa). Such a demand is put forward in an open dewatering, as well as a well point dewatering, which is due to a high position of dewatering facilities to the level of water in the pits, and the desire to intensify the process of dewatering of fine-grained soils by creating as many as possible to pressure on the filter surface of the well point, plunges into the ground.
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