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Tired of Clogging and Vibrations in Your Sewage Pumps?

Sewage water problems

Handling sewage water has always been a challenge and its nature is constantly changing. There are also great differences between the sewage systems across countries and their respective levels of pollution. It is often the large solids and long-fibrous materials that place real demands on sewage pumps. In addition, we should not underestimate the irregular volume and flow of air within the system, making it difficult to make the right pump choice.

Prevention is better than cure

How can you prevent blockages or avoid high repair costs due to vibrations on sewage pumps? In order to answer these questions, we will first look at the unique properties of the different sewage pump impellers.

The unique features of different sewage pump

In order to avoid getting bogged down in boring design terminology, we focus on the heart of the matter, the pump impeller. In order for you to reach a good conclusion we have listed the features of the impeller types which are suitable for pumping sewage water.

Is there such a thing as the perfect impeller for pumping sewage?

Sewage water specialists know that the screw centrifugal impeller with two 5 star ratings is excellent at pumping large solids and long-fibrous materials. But there are also a few drawbacks to this impeller, which are especially applicable to mobile sewage pump installations.

Vibrations at higher speeds

The design of the impeller has the shape of a corkscrew and is therefore difficult to balance. This is why the pump cannot run at higher speeds and becomes very restless when there is a lot of air in the volume flow. Another disadvantage is the sensitivity to wear. If sand is present in the liquid, the clearence between the impeller and cone will quickly increase, causing the efficiency to drop. Wouldn’t it be great to combine all the good features of the different sewage pump impellers into one design? The half-open impeller is already close to perfection. Some manufacturers work with cutting blades or cutting grooves in the wear plate that chop fibrous materials into smaller pieces. The chance of blockages is therefore reduced, however, it never works completely flawlessly.

The solution is the KS screw channel impeller

Through a smart redesign we can turn the drawbacks of the screw centrifugal impeller into positive properties. The solution is now available and the results are amazing. The corkscrew design remains, but it gets its own “flywheel”, which creates much more stability during pumping. This allows the speed to be increased to 2300 rpm and the pump continues to run vibration free. The big advantage of a higher pump speed is the higher pressure that the pump delivers (more than 4 bar). Air in the volume flow is no longer a problem. Further, if sand is present you will now have much less wearing, because the liquid is no longer guided along the cone.

Centrifugal pumps deliver more pressure with a higher pump speed

You need pressure to bridge the height difference and pipe friction loss while pumping a certain amount of liquid. This is especially true for mobile sewage pumps, the more pressure the pump can deliver, the more flexible you are to take on bypass projects. The calculation example below clearly shows that increased pump pressure is not an unnecessary luxury.

Practical example of a temporary sewage pump installation

In a random city district, the existing sewerage system must be replaced. According to the specifications, the waste water flow must be maintained by a temporary pump installation with a minimum capacity of 350 m3/hour. The drain in which the discharge takes place is just 130 meters away on the same side of the street, so for the sake of convenience we do not count the resistance losses of accessories. The sewer has a maximum depth of 3 meters and the height difference on the discharge side is just 1 meter. Given the required capacity, a 6-inch sewage pump including connected piping seems obvious. The system calculation will then look like this:

The KS screw channel impeller

This specially developed closed KS screw impeller is a real waste warrior. The pump also runs vibration-free at high speeds. Air or gas bubbles in the volume flow are no longer a problem. Further, if sand is present, you will have much less wear, because the liquid is no longer guided along the cone.

Conclusion: The KS screw channel impeller is the best choice for sewage pump work.