SAI - For sewage treatment plants

Long distance pumping

Smart Air Injection (SAI) is a customized package unit with many varied applications. The innovative combination of progressive cavity pump and compressed air conveying results in a low-pressure level in the conveying pipeline. This results in an extended service life and reduced investment and operating costs.

Smart Air Injection is used in the environmental sector for transporting sewage sludge up to 1,000 meters using compressed air and boundary layer injection - convenient, extremely low-friction, and energy-efficient.

Conveying Capacity
0.5–30 m³/h
2–132 US gpm
4 bar
60 psi

Features and Benefits


Total energy consumption reduced by up to 72% compared to conventional conveying technologies

Lower investment costs

Long service life and low investment costs due to less expensive pipes and fittings with low pressure stability (PN 10)

Maintain in Place

Easy Maintenance Concept: Maintenance-in-Place possible - Smart Conveying Technology for rotor/stator replacement with minimal space requirements in less than one hour

For long distances and height differences

Long transport distances of up to 1,000 meters and easily overcomes changes in direction and differences in height

Low pressure requirements

Increased component lifetimes and up to 88% savings in maintenance costs due to extremely reduced discharge pressure of only 2-4 bar

Easy to control

Control and monitoring of all functions via the SAI controller and easy integration into all automation and control systems


Closed system with integrated cleaning function

Technologies, accessories and options

Dry running protection / TSE

TSE monitors the temperature of the rotating stator and shuts down the pump when the limit value is reached to protect the pump from dry running.

Air receiver

For storing and releasing compressed air from the upstream compressor.

Smart conveying technology

For rapid replacement of the rotor and stator. Maintenance downtime reduced by up to 85%.

Extension hopper

Connected to the upstream dewatering machine. Controls the pump speed with a level sensor.

Air injection

Compressed air is pulsed into the pipeline to convey the pre-compacted sludge plug.

Boundary layer injection

To reduce friction losses in the pipeline. To optimize costs the conveying capacity of the lubricant is automatically adjusted to the conveying capacity of the main pump.

Compression casing

Ensures optimal feeding of the media. Quick and easy maintenance: available as a conical compression casing in conjunction with Smart Conveying Technology or as a sliding compression casing.

BTHE pump

These pumps are equipped with a rectangular feed hopper with vertical hopper walls and a concentrically rotating ribbon screw. Even in the case of media with a high solids concentration, efficient emptying of the feed hopper and an optimum supply of viscous sludge into the pump's conveying elements is guaranteed.

Overpressure Protection

The pressure gauge switches off the pump as soon as a pre-set pressure is exceeded or not reached and protects the pump from increased wear and tear or piping damage.