Longer operating time in Todtnauberg
Prior situation
In order to extend the operating time of the ski region Todtnauberg, a reservoir lake for water supply of snow-guns was created. The high pressure centrifugal pump that was employed is one of the biggest Caprari offers in Germany.
Caprari's proposal
The artificial lake is 1400 m above sea level and holds 12,000 m³ of water. A high pressure multi- stage pump of type PMS 80/7Y with horizontal shaft was installed in the pump casing. Its motor power of 132 kW is enough to supply the system with 3,000 litres of “snow-gun-feed”per minute. Shafts - spaced at intervals of approximately 50 m - are placed on the about 1500-metre-long field pipeline to supply snow-lances with water. Thanks to this solution the operator can cover the tracks for about three days non-stop. However, the actual time is longer, because the lake is fed by a stream.
Advantages achieved
As the pump is electronically speed controlled, the system runs without pressure surges and reacts smoothly to power variations. Caprari, the manufacturer, equipped the generously dimensioned pump shaft with ball bearings on both sides in order to absorb axial and radial loads in both directions. Moreover, an impeller with axial thrust balancing and a lamination drum were installed to protect the bearings. The rotational speed of the pump made of resistant grey cast iron, ductile iron and bronze is between 1450 and 3500 rpm, which makes for low-wear operation.
This pump builds up a pressure of up to 100 bar to reach delivery heads up to 1000 m.
Plenty of performance that makes it attractive not only for alpine users, but also for water sup- plies of different types, e.g. in buildings or for industrial processes.