How should such a pump be selected? 15 tons flow rate, 120 meters head
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For use with tunnel wastewater, a flow rate of 15 tons is sufficient. The horizontal distance over which the water needs to be transported is 1000 meters; the transport is uphill, with a height difference of 30 meters. The wastewater contains sludge, and the amount of sludge is unstable; at high levels, it is in a 1:1 ratio with the wastewater
An open-type centrifugal sewage pump should work fine. With a flow rate of 15 cubic meters, a head of 45 meters is sufficient.
When I was young, there were submersible dam projects in my area, with conditions similar to yours; at that time, centrifugal pumps driven by diesel engines were used, and they worked quite well. As for screw pumps, I have not used them under such operating conditions, so it is difficult to draw a conclusion.
It is recommended to use a single-screw pump, as the delivery distance is long and the pressure needs to increase gradually; a single-screw pump is more suitable for this purpose. If you are interested, I can prepare a plan for you
The head is too high; a positive displacement pump or a screw pump is needed
For single-screw pumps, we use them for our current carbon black slurry – the pipelines don’t get clogged easily
The head can be roughly calculated by estimating the pressure drop across the entire pipeline; as for the type of pump, it is necessary to consult experienced manufacturers. It is recommended to directly approach the manufacturer to issue a tender for a plan.
Slurry centrifugal pumps can also be used; their flow rate and head should be sufficient for handling liquids containing solid particles. Different manufacturers have varying requirements regarding the solid content and size of these particles, but the solid particles in the pipeline will settle, leading to blockages in the pipeline.
For low flow rates but high head, diaphragm pumps are more suitable; moreover, there is sludge present, so wear resistance is required