Grundfos SL.150.220.4.52H.N.51D.A.T Cast Iron 4-Pole Sewage Pump for Municipal Sewage with Open S-Tube Impeller

Reliable sewage collection and wastewater transfer in municipal networks require subsurface infrastructure capable of processing high ingress rates. The Grundfos SL.150.220.4.52H.N.51D.A.T establishes circulation stability for effluent management in collection pits where fluid temperatures range between -10 and 40°C. Maintaining structural integrity during permanent immersion is necessary for drainage infrastructure. This four-pole unit supports continuous service in gravity drainage networks prone to varying liquid levels.

Hydraulic capacity is provided by a 22 kW four-pole motor operating on a 415v three-phase supply with a rated current of 43 Amps. This assembly generates a maximum flow of 8,640 L/min and reaches a maximum head of 33.3 m to satisfy requirements in high-volume transfer applications. The motor utilizes a star-delta starting method to manage peak electrical loads and ensure torque stability during initial activation cycles. Consistent pressure behavior ensures the system satisfies the requirements of municipal networks.

Internal fluid velocity paths utilize an Open S-Tube impeller configuration designed for the free passage of solids in suspension. This centrifugal configuration facilitates the movement of contaminated liquids without the internal clogging that compromises volumetric efficiency over long-term service. By utilizing a high-efficiency hydraulic profile, the unit minimizes internal friction and vibration to protect the rotating assembly during high-volume discharge. The Open S-Tube setup is intended for wastewater transfer where high-capacity solids handling is critical.

Mechanical construction utilizes a heavy-duty cast iron housing and motor shell with an IP68 protection rating for depths up to 20 m. Longevity is anchored by a silicon carbide primary shaft seal and a silicon carbide/carbon secondary seal in an oil bath for motor insulation. This model includes integrated thermistors and moisture sensors to facilitate proactive monitoring of the motor assembly. The architectural casting includes a 324 kg net weight and DN 150 connections for high-capacity integration into standard wastewater infrastructure.

Features

• 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 rigid structural foundation for permanent submerged installations.
• Double mechanical shaft seal utilizing silicon carbide faces in an oil bath ensures the motor remains shielded from liquid ingress.
• Internal thermistors and moisture sensors provide real-time monitoring to safeguard the electrical assembly against overheating.
• Four-pole motor configuration operating at 1,476 rpm provides the hydraulic torque needed for processing high-volume wastewater.
• Standardized DN 150 inlet and DN 150 outlet connections allow for high-capacity liquid transfer through standard plumbing.
• IP68 protection rating confirms the system is suitable for continuous duty in submerged environments up to 20 m deep.