Envirolift Water Lifting Screws

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Aquasystems International N.V. SFA enviro

Halle, Belgium

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The Envirolift Water Lifting Screws, called screw pumps, are designed according to the Archimedes principle. This principle consists of making 1 to 3 threads around a central rotor, which in an inclined position, and in a suitable rotational movement, ensures the rise of the water to a higher level.
This technology is insensitive to variations in flow rates and waste, that the effluent may contain. Under certain extreme conditions, however, a protective grid may be added. To facilitate its implementation, it is recommended to add a metal trough.
This is the oldest water-lifting technology, and its lifespan remains unmatched compared to any other system. Even in the case of an operation without water (test, maintenance, negligence, or clear control by level probes), there is no risk of deterioration of the equipment. On the other hand, the power consumption is less than with a classical pump.
LAYOUTS of Envirolift Water Lifting Screws

Water lifting screw
Lower bearing
Trough (Option)
Motorization / Upper bearing
Effluent outlet
Effluent inlet

CENTRAL TUBE
The diameter and the thickness of the central tube are calculated as a function of the external diameters, the length, and the inclination of the lifting screw, but also according to the number of spirals.
SCREW
The diameter, pitch, and number of screws are calculated according to the desired flow and height of lift, taking into account the geometry of installation. The screw absorbs the flow which arrives at the foot to maintain it to the upper part. This is within the limit of the capacity for which it has been dimensioned. It is a so-called volumetric pump.
DRIVING
The power of the drive unit is calculated in relation to the geometrical characteristics of the lifting screw and its maximum flow. It is an essential component that must be perfectly aligned with the screw axis.
TROUGH
The trough of the lifting screw is traditionally made of concrete by the civil engineer. This is a rather delicate operation. For this reason, we offer metal troughs that are particularly well-suited and ensure the perfect alignment of the screw with respect to its trough. Implementation is therefore much simplified.
MATERIALS of Envirolift Water Lifting Screws

Construction in stainless steel 304L or 316L

SPECIFICITIES of Envirolift Water Lifting Screws

Large range of flow rates
Flexible to flow rate variation
Not sensitive to waste
Design with and without a trough
Up to 3 m diameter and 20 m length
Lifespan over 30 years
Low maintenance costs

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