Grundfos SE.56L.280.6.50D.350 Cast Iron Low-Head Wastewater Pump for Groundwater Drainage with Open S-tube Impeller

Groundwater drainage stations and municipal flood mitigation sumps rely on the high-capacity transfer capabilities of the SE.56L.280.6.50D.350 for large-scale collection. This cast iron unit is intended for municipal and industrial wastewater applications where untreated effluents containing solids must be moved reliably. It is suitable for infrastructure environments where liquid temperatures range from 0°C to +40°C.

The pump achieves a maximum flow rate of 25380 L/min and a maximum head of 20 m powered by a 28 kW motor drawing 59.5 Amps. Operating on a three-phase 415 V supply, the motor utilizes an internal cooling jacket for thermal safety. This integrated setup provides stable temperature management during high-capacity drainage cycles in wastewater infrastructure.

The hydraulic handling is characterized by an Open S-tube impeller with a 411.2 mm actual diameter and a 105 mm free passage for managing untreated wastewater containing solids. The nominal duty head is 10.46 m. This design features a 350 mm inlet and a 300 mm outlet with DIN flanges, supporting high-volume transfer while reducing clogging risks in municipal collection systems.

Structural durability is provided by an EN-GJL-250 cast iron motor casing and pump housing, featuring double mechanical SiC/SiC shaft seals. Safety is monitored by integrated PTO sensors, moisture switches, and leakage sensors for proactive motor protection and monitoring. The unit is supplied with a 10-metre S1BC4N8-F EMC power cable and an IP68 enclosure for depths up to 30 metres.

FEATURES

• Open S-tube impeller with 411.2 mm diameter and 105 mm passage for managing raw effluents.
• Cast iron EN-GJL-250 pump housing and motor casing for structural integrity in utility networks.
• Double mechanical shaft seal with SiC/SiC primary faces and Silicon Carbide/Carbon secondary barrier.
• Integrated PTO sensors, moisture switches, and leakage sensors for motor protection and monitoring.
• Internal cooling jacket system facilitating thermal management in submerged or dry pit environments.
• Supplied with a 10-metre S1BC4N8-F EMC power cable for reliable connection in drainage sumps.
• IP68 enclosure suitable for installation depths up to 30 metres and 5 bar operating pressure.
• Compatible with the Grundfos DN300 auto-coupling system (96255839) for simplified maintenance access.

IMPORTANT: Bulk freight charges apply. Please contact us for a freight quote before ordering.