If the water does not go to the pump, it goes to the water. In other words, make the submersible pump, leak-proof and drop on the water, bringing out pipes and power cables. As a result, this pump is the depth of the well or borehole is not essential, it can be, and 40-50, and over 100 meters. The submersible pump requires no installation (except suspension), does not take place – hangs himself in the well, quietly, water pumps. However, service or repair it is not so simple: it is necessary to disconnect the hose, pull the pump from the well, sort hermetic enclosure, and then all the same in reverse order. If the pump is installed in a borehole depth of tens of meters – is still difficult. Therefore, submersible pumps are very reliable, and therefore expensive.
Despite the dominance of imports, the constant demand domestic submersible pumps “Babe”. They are ideal for lifting water from wells and boreholes with a depth of 30 meters and pumping fresh water from reservoirs. Productivity “kids” 70 l / min, power 250 W, dimensions 280 x 90 x 90 mm, weight 3,5 kg.
Among the submerged distinguish Pit and downhole pumps. Manhole in comparison with well distinguished by the presence of equal power internal cooling jacket of the engine, a larger diameter, higher engine efficiency, performance and lower cost. Submersible pumps are designed for installation in deep and narrow wells, and therefore represent a cylinder of small diameter. Given that the tube wells may be curved, the pump pick up at least a millimeter in diameter to 10-15 less than the tube. But the diameter of the hole should not be much larger than the diameter of the pump, since the cooling of electric well pumps, in contrast to the well, lifted by the flow of water, and in the technical documentation must specify the minimum allowable speed of water movement.
For a surface pump is immaterial what the water column beneath it. A submersible, if the bottom is less than a meter, could suck in sand and silt, and then quickly breaks down.
The nature of the well determines the design of the required pump. If she is fine, “Taco”, the water will be a lot of fine sand in the form of suspension, which did not catch the well screen. In this case, the pump must have a special “floating” impellers, special bearings, increasing the gap between the impeller and the guide cylinder. All this reduces its efficiency, but allows you to pump water containing sand up to 150 grams per cubic meter. If the well is deep, “Taco” – all a bit easier: it allows the performance of pumping water thousands of liters per hour, and the water is always clean, without mechanical impurities.
