Grundfos SL.150.185.4.52H.N.51D.A.T Cast Iron 4-Pole Sewage Pump for Lift Stations with Open S-Tube Impeller

Managing high wastewater volumes in deep municipal collection pits requires specialized hydraulic solutions capable of processing large volumes of contaminated liquid. The Grundfos SL.150.185.4.52H.N.51D.A.T addresses these environmental demands by providing a solution for 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 pits prone to varying liquid ingress and high service duties.

Hydraulic behavior is driven by an 18.5 kW motor operating on a 415v three-phase supply with a rated current of 39 Amps. This assembly generates a maximum flow of 7,980 L/min and achieves a maximum head of 29 m for high-volume transfer applications. The motor operates at 1,479 rpm, ensuring consistent pressure behavior and circulation characteristics during high-load evacuation cycles. Power is distributed through a 15-metre power cable to support integration into subsurface drainage networks and municipal pump stations.

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 contaminated liquids without the internal clogging that could otherwise compromise volumetric throughput over thousands of operating hours. By utilizing a high-efficiency hydraulic profile, the unit minimizes internal wear and vibration for the rotating assembly during high-volume discharge. The Open S-Tube design is intended for municipal wastewater 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. Longevity is anchored by a double mechanical shaft seal arrangement with silicon carbide faces in an oil bath for motor insulation. This model includes internal thermistors and moisture sensors to facilitate proactive monitoring of the motor assembly. The architectural casting includes a 321 kg net weight and DN 150 connections for high-capacity integration into standard wastewater infrastructure.

Features

• Open S-Tube impeller configuration facilitates high-efficiency solids handling and prevents internal blockages in high-volume networks.
• Heavy-duty cast iron housing and motor shell provide a rigid structural 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.
• Internal thermistor and moisture sensors provide real-time monitoring to safeguard the electrical assembly against overheating.
• Four-pole motor configuration operating at 1,479 rpm provides the starting torque required for processing high-volume wastewater.
• Standardized DN 150 inlet and DN 150 outlet connections allow for high-capacity liquid transfer through municipal plumbing.
• IP68 protection rating confirms the system is suitable for continuous duty in submerged environments up to 20 m deep.