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Archimedes screw

No change in size, 06:38, 6 November 2012
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==Suitable conditions==
A major advantage of these pumps is variable pumping at constant speed, because the output (up to design capacity) is controlled by the sump level and equals the influent flow rate. The disadvantages are the inducement of turbulence, the release of odors and other volatile substances (if using for wastewater), and the relatively high initial cost (if using metal components, but not wooden). But when comparing costs with those of other types of pumps, consider the cost of the total system, including all piping, wet or dry wells, screens, fittings, valves, variable-speed controls, and other accessories as well as operating and maintenance costs. Note that operators like screw pumps because the good ones, when properly installed, are so trouble-free.<ref> [http://uotechnology.edu.iq/dep-building/LECTURE/sanitary%20&%20environmental/third_class/Water%20Networks%20and%20Equipment/D-pumps-3rd%20Class.pdf Pumps and Pumping Stations, 3rd Class. ] By Dr. Sataa Al-Bayati. University of Technology - Iraq.<ref/>
====Materials====
This simple screw pump can be viewed as a series of ramps around a central axle. As you turn the PVC pipe, you carry the water in small lifts from one ramp to another until it pours out of the top. It is much easier to pump water with a conveyor screw than to lift the water vertically, just like walking along a winding mountain path is easier than climbing straight up.
 
 
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