Grundfos SL.150.200.4.52H.N.51D.A.T Cast Iron 4-Pole Sewage Pump for Wastewater Handling with Open S-Tube Impeller

Operational load scaling for municipal lift stations and drainage infrastructure is facilitated by the heavy-duty structural build of the Grundfos SL.150.200.4.52H.N.51D.A.T. This submersible unit addresses requirements for the removal of contaminated liquids in collection pits where reliable solids passage is required for maintenance. The system handles wastewater transfer at temperatures up to 40°C in subsurface collection pits. Maintaining operational flow behavior in permanent submerged installations is essential for infrastructure protection and facility maintenance.

Hydraulic capacity is driven by a 20 kW four-pole motor on a 415v three-phase supply, generating a maximum flow of 8,340 L/min and a maximum head of 32.7 m. Operating with a rated current of 41 Amps at 1,478 rpm, the unit maintains consistent torque and circulation stability during high-load duty cycles. A star-delta starting method is utilized to optimize electrical consumption and manage start-up loads in deep-pit applications. Power is distributed effectively to support discharge requirements in municipal networks.

The Open S-Tube centrifugal impeller configuration facilitates the movement of solids in suspension without internal clogging that compromises volumetric efficiency. This design handles wastewater, maintaining efficiency throughout thousands of operating hours in municipal environments. By utilizing the Open S-Tube hydraulic design, the unit minimizes internal friction and vibration to protect the rotating assembly during high-volume discharge. The impeller setup is intended for wastewater handling in municipal lift stations.

Mechanical integrity is reinforced by a heavy-duty cast iron body and motor shell with an IP68 protection rating for immersion up to 20 m. Longevity is anchored by a double mechanical shaft seal arrangement featuring silicon carbide faces and an oil bath for motor protection. This model includes integrated moisture sensors and thermistors for proactive monitoring and early fault detection of the motor assembly. The casting includes a 321 kg net weight and DN 150 connections for high-capacity integration into standardized wastewater infrastructure.

Features

• Open S-Tube impeller configuration facilitates high-efficiency solids handling and prevents internal blockages in wastewater collection.
• Heavy-duty cast iron construction of the housing and motor shell provide the structural durability needed for deep pit installations.
• Double mechanical shaft seal in an oil bath with silicon carbide faces ensures the motor remains shielded from liquid ingress.
• IP68 protection rating confirms the unit is suitable for permanent immersion in wastewater collection pits up to 20 m deep.
• Four-pole motor operating at 1,478 rpm provides the starting torque required for high-volume sewage collection systems.
• DN 150 inlet and DN 150 outlet connections allow for high-capacity liquid transfer through standard pipework.
• Integrated thermistors and moisture sensors enable real-time monitoring to safeguard the electrical assembly.