Grundfos SL.100.100.4.52H.N.51D.A.T Cast Iron 4-Pole Sewage Pump for Stormwater with Open S-Tube Impeller

Stormwater handling and wastewater collection in municipal environments require specialized hydraulic solutions capable of processing large volumes of contaminated liquid. The Grundfos SL.100.100.4.52H.N.51D.A.T addresses these environmental demands by providing a solution for stormwater handling and wastewater transfer. This four-pole submersible pump maintains stable performance across temperatures from -10 to 40°C in drainage stations and lift stations. The system is intended for permanent submerged installation in subsurface collection pits prone to varying fluid ingress.

Hydraulic capacity is driven by a 10 kW four-pole motor operating on a 415v three-phase supply with a rated current of 21 Amps. This assembly generates a maximum flow of 6,000 L/min and achieves a maximum head of 21.1 m for stormwater handling duties. Operating at 1,482 rpm, the four-pole motor provides the starting torque necessary for processing fluids in high-volume stormwater systems. Power is distributed through a 15-metre power cable to support integration into subsurface 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 stormwater handling 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 1,482 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.