To pump water from a depth of more than 8 m, we will use a submersible pump, which in the set with
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forms a pressure booster pump.
When the pressure in the system drops below the set on pressure, the pressure switch automatically switches on the pump and turns it off when the set cut-off pressure is reached. In case of water shortage in the well and in case we have dry running protection installed, the switching device turns off the pump and protects it from damage. The dry-water protection switchgear will then not allow the pump to switch on until sufficient water level in the well has been reached.
Pumps for pressure sewers are used where it is necessary to overcome height differences and it is not possible to build a normal gravity sewer. They are ideal for lower sumps and pressure wastewater pumps with the appropriate conveying height are used. These pumps are installed in so-called pumping sumps, which are fully equipped small wastewater pumping stations. The sump is an ideal solution, especially for holiday homes such as summer houses and lodges, or even for permanently occupied properties if you have any problems connecting to the local sewerage system and obtaining the relevant permits.
The HD design has an improved grinder with excellent efficiency when cutting long solid particles. It is suitable for installations where there are problems, for example, with non-woven fabrics.
Drainage of sewage from the house can be realized by means of a pumping station(1) located outside the house. It is suitable for pumping and accumulating drainage and surface water, as well as wastewater from residential buildings and industrial plants. Pumping stations are made of polyethylene and can be provided with either one or two pumps(2). Reliable operation is then ensured by the control unit. When installing a pumping station, it is necessary to ensure its protection against the reverse flow of pumped fluid by means of a check valve with a ball (3). Due to possible service intervention, it is also necessary to install a shut-off valve on the delivery pipe (4).
1. Select the type of pump according to the size of the borehole
– we recommend a difference of min. 30 mm between the borehole wall and the pump
2. Find the required pump flow
The flow rate depends on the number of supply points and the number of people in the household. For a medium-sized family house with 3-5 people, we expect a nominal flow rate of 2 – 2.9 m3/hour = 33.3 – 48.3 l/min.
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3. Find out the required head (conveying height)
The total head corresponds to the sum of 3 values:
For the medium house, a nominal flow rate of 2 m³/hour is suitable, so we choose with a reserve of 2.25 m³/hour.
Screw pumps belong to the family of dry compressing gas transfer pumps. They are positive-displacement pumps that use two screw shaped intermeshing rotors to move gas along the screw’s axis. They are frequently used in industrial vacuum applications, often in combination with roots blowers and as oil-free roughing pumps in high and ultrahigh vacuum systems.
Screw pumps operate using two counter-rotating screw rotors which are engineered so that they rotate “towards each other”. This traps the gas in the space between the “screws” of their rotors. As the screws rotate, this trapped volume decreases which not only compresses the gas but moves it towards the exhaust.
Mechanical bearings support the rotors at both ends. The cantilever design solution supports the rotors at the high-pressure end and the rotors can be cooled internally. A motor drives the two rotors via a gear. Gear and the bearings are lubricated but separated from the pumping mechanism ('vacuum generator') via shaft seals or labyrinth seals, thus the compression is oil-free. The rotors have no mechanical contact between each other and the pump housing, resulting in zero mechanical wear. To keep the installed electrical power low, modern pumps are driven by an electronic frequency converter and rotate slower at pressures ranges near atmospheric pressure. Some versions use so-called blow-off valves instead to keep the rotating speed constant also at high pressures. Cooling is normally done by water.
Screw pumps can reach ultimate pressures of ~ 1e-3 mbar. The operating pressure range is 103 to 10-2 mbar. Various sizes with pumping speed ~ 60 - m³/h are available. The pumping speed in the vacuum range < 10 - 50 mbar can be enhanced by placing a roots blower on top. These combinations, often in one single pump housing, are available up to m³/h
Screw pumps have become the standard solution in almost every industrial vacuum process. Vacuum furnaces for brazing or sintering, metallurgical systems, even steel degassing plants use the advantage of dust resistance and long service intervals. In food processing, food drying, food packaging and even freeze dryers tend to use oil free screw pumps to avoid the contamination of pump oil by water or debris from the process. Large scale coating like architectural glass coaters use screw pumps as roughing pumps for the high vacuum pumps. Screw pumps also are the ideal choice for regeneration of larger cyropumps.
Screw pumps are today also the standard primary pump in large scale scientific experiments such as big storage rings, gravitational wave detectors or space simulation chambers.
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