Grundfos SL.100.185.2.52S.N.51D.A.T Cast Iron 2-Pole Sewage Pump for Lift Stations with Open S-Tube Impeller

Operational efficiency in municipal wastewater networks is maintained by high-performance hydraulic units designed for continuous service. The Grundfos SL.100.185.2.52S.N.51D.A.T submersible pump provides the torque and discharge capacity necessary for high-volume effluent transfer. Operating at temperatures up to 40°C, the system ensures stable circulation in lift stations and collection pits prone to varying fluid ingress. This unit is intended for lift station applications where reliable solids passage and infrastructure protection are required.

Hydraulic performance is provided by an 18.5 kW motor operating on a 415v three-phase supply with a rated current of 36 Amps. This model achieves a maximum flow of 4,686 L/min and reaches a maximum head of 46 m. The motor utilizes a star-delta starting method to optimize electrical consumption and manage start-up loads in deep-pit applications. Electrical connection is established via a 15-metre power cable to facilitate distribution for subsurface wastewater handling.

Internal fluid paths utilize an Open S-Tube impeller designed for the free passage of solids in suspension. This centrifugal configuration facilitates the movement of contaminated liquids without internal contact that compromises volumetric efficiency during prolonged discharge. By utilizing a high-efficiency hydraulic design, the unit minimizes friction and vibration to protect the rotating assembly during wastewater transfer. The Open S-Tube design prevents clogging in municipal collection pits and drainage stations.

Mechanical integrity is reinforced by a heavy-duty cast iron housing and motor shell with an IP68 protection rating for depths up to 20 m. Motor protection is anchored by a double mechanical shaft seal arrangement featuring silicon carbide faces in an oil bath. This model includes integrated moisture sensors and thermistors to facilitate operational monitoring of the motor assembly. The architectural casting features a DN 100 inlet and DN 100 outlet for integration into standard wastewater infrastructure.

Features

• Open S-Tube impeller configuration facilitates high-velocity solids handling and prevents internal blockages in municipal wastewater networks.
• Heavy-duty cast iron pump housing and motor shell offer the structural durability needed for deep pit site installations.
• Double mechanical shaft seal with silicon carbide faces in an oil bath ensures protection for the 18.5 kW motor.
• IP68 protection rating allows for permanent immersion in sewage collection pits at installation depths up to 20 metres.
• Integrated thermistors and moisture sensors enable proactive maintenance for the electrical assembly.
• Maximum operating pressure of 8 bar supports integration into large-scale pressurized sewage collection systems.
• Rated current of 36 Amps and star-delta starting method provide the hydraulic torque needed for high-head transfer.