The (Archimedean) Screw Pumps are well-known for their excellent qualities such as the Simple & Rugged design, the high efficiency, the capacity to pump raw water (even when it contains an amount of solids and debris) and their lifetime reliability.
Spaans Babcock has a worldwide reputation of being the oldest and the largest manufacturer of Archimedean Screw Pumps with a track-record of more than 30,000 screw pumps installed.
Screw Pumps can be used for capacities from 15 litres/sec up to max 11 m3/sec and come in 3 basic forms: built in the traditional concrete trough, with steel trough liner and the prefabricated, ‘ready to install’ compact units.
The most common application is in waste water treatment plants for lifting the incoming sewage to a higher level without the need of installing a screen upstream and to pump back to the same level the return sludge.
Screw Pump in a Concrete Trough
The classic and most common form is the arrangement of the screw pump in an open concrete trough where the screw, suspended between the upper- and lower bearing, rotates free from the trough with a minimal gap of only a few millimetres.
Screw Pump with a Steel Trough Liner
Although this type requires a similar civil construction as the previous described ‘concrete trough’, thanks to the prefabricated steel trough liner, installation is much easier and the wear resistance of the trough in situations where lots of stones and pebbles come to the inlet, increases.
Compact Screw Pump (ESP: Encased Screw Pump)
For this type there is no civil construction required. A prefabricated self-supporting steel construction with integrated inlet-section, outlet-section, trough, screw pump and drive unit is preassembled and shipped in one piece, ready for immediate installation. The compact screw pump is ideal for small capacities but is also applied for capacities up to 5 m3/sec.
Advantages of screw pumps
Parameters for screw pumps
Screw Pump components
Pump selection questionnaire
In order to design an Archimedean screw pump, below parameters and dimensions shown on the drawing and table below, have to be defined:
TP Touch Point
FP Fill Point
CP Chute Point
MPP Max. Pumping Point
ß Angle of Inclination
LF Length of Flights
Hc Head, civil
He Head, effective
Hh Head, hydraulic