Launch Pad

SE1 pump with S-tube impeller

Water Today

2 mins read

The fundamentals of the revolutionary S‐tube impeller have actually been on pump designers’ drawing boards for decades. The volume and diversity of waste material to be transported was relatively low, and therefore details such as the water and energy usage were barely considered by utility providers. It is only in the past two decades that a variety of factors have all collided to make the S‐tube design relevant. These include: increased environmental awareness, new government legislation and directives, and the rising cost of water, energy and wastewater transport.

• Modern wastewater management systems must be able to transport an increased volume and diversity of waste over longer distances, but using less energy and transportation fluid

• This requires a centrifugal pump that does not compromise on either clogging or hydraulic efficiency and offers extended life span with minimal maintenance

• Special features at the front and back plate of the closed S‐tube also optimises the leak flow into the cavities between the rotating impeller and the stationary pump housing

• Because the non‐compromised inner diameter of the S‐tube is uniform, there is less likelihood of clogging, even with a relatively low volume of transportation fluid as found in modern‐day wastewater

• Consequent hydraulic efficiency gains drive down energy costs for the end‐user

• Furthermore the lack of a leading edge has the benefit of significantly lowering NPSH inside the centrifugal pump where the hydraulic system is most prone to cavitation

Integrated with motors, hydraulics and a seamless functionality, the intelligent SE1 solutions is one of the most efficient wastewater pumps. Grundfos SE range of pumps with an S-tube impeller have also been able to significantly boost energy savings in wastewater operations while simultaneously reducing the number of jamming related incidents.


• This cutting-edge solution is ideal for processes with a higher volume of water/liquid flow

• They are used to handle wastewater, process water and unscreened water processes in municipalities, utility and industrial applications

Water Today | Magazine