Grundfos SL.100.185.4.52H.N.51D.A.T Cast Iron 4-Pole Sewage Pump for Sewage Transfer with Open S-Tube Impeller

Sewage pumping operations benefit from the Open S-Tube hydraulic efficiency of the Grundfos SL.100.185.4.52H.N.51D.A.T. The cast iron 4-pole submersible unit draws 39 Amps from an 18.5 kW 415V motor and achieves flows to 7,980 L/min at 29 m head. The four-pole configuration operating at 1,479 rpm ensures stable hydraulic performance across a wide range of flow conditions. The system handles liquid temperatures from -10 to 40°C and is designed for permanent submerged installation.

Hydraulic performance is provided by an 18.5 kW four-pole motor on a 415v three-phase supply, generating a maximum flow of 7,980 L/min. This model achieves a maximum total head of 29 m for sewage pumping duties. Operating with a rated current of 39 Amps, the unit maintains consistent torque and circulation stability during continuous duty cycles. Rapid evacuation is achieved through the DN 100 discharge port to protect infrastructure in gravity drainage networks.

Internal fluid paths feature an Open S-Tube centrifugal impeller designed for the free passage of solids in suspension. This configuration facilitates the movement of wastewater without internal clogging that could otherwise compromise volumetric throughput over thousands of operating hours. By utilizing a high-efficiency hydraulic profile, the unit minimizes internal friction and vibration to protect the rotating assembly during prolonged duty cycles. The Open S-Tube design is intended for sewage pumping where reliable flow behavior is required.

Mechanical construction features a heavy-duty cast iron housing and motor shell with an IP68 enclosure rating for immersion up to 20 m. Motor insulation is maintained by a shielded assembly with double mechanical shaft seals in an oil bath for maximum durability. Integrated moisture sensors and thermistors allow for proactive monitoring and early fault detection. The casting includes a DN 150 inlet and a DN 100 outlet connection for integration into standard wastewater infrastructure.

Features

• Four-pole motor configuration operating at 1,479 rpm provides the hydraulic torque needed for processing high-volume wastewater.
• Open S-Tube impeller design enables the passage of solids through the pump casing without compromising hydraulic throughput.
• Heavy-duty cast iron housing and motor shell provide a stable and rigid foundation for permanent submerged installations.
• Primary silicon carbide shaft seal and secondary carbon/silicon carbide seal in an oil bath protect the motor from liquid ingress.
• IP68 enclosure rating confirms the system is suitable for continuous duty in submerged environments up to 20 m deep.
• Integrated thermistors and moisture sensors enable real-time monitoring to safeguard the electrical assembly.
• DN 150 inlet and DN 100 outlet connections allow for high-volume wastewater transfer through standard plumbing networks.