Zenit GRG 550 Cast Iron Grinder Pump with Multi-Channel Open Impeller & Rotary Knife (Max 270LPM/430kPa)

The Zenit GRG 550 is a powerful and robust submersible grinder pump designed for pumping sewage and heavily contaminated wastewater where high discharge pressure and solids reduction are essential. Equipped with a multi-channel open impeller and an integrated rotary knife cutting system, this pump delivers unmatched grinding capability while maintaining consistent hydraulic performance.

With a maximum head of 43 metres and flow rate up to 270 litres per minute, the GRG 550 is ideal for civil, industrial, and agricultural applications requiring long discharge runs or high lift, particularly in areas with small-diameter pipelines.

FEATURES

• Integrated Rotary Knife Grinder System – Chromium steel blades grind solids before reaching the impeller
• Multi-Channel Open Impeller – Robust cast iron design ensures efficient hydraulic performance
• High Head Capability – Delivers up to 270 kPa (27 m) of head, ideal for long pumping lines
• Heavy-Duty Cast Iron Construction – Built to last with EN-GJL 250 cast iron body and impeller
• Dual Mechanical Seals – Silicon carbide (2SiC) seals in an oil chamber for long life and reliability
• Stainless Steel Shaft – AISI 431 shaft with tapered coupling ensures strength and corrosion resistance
• Anti-Clogging Design – Efficient solids expulsion and reduced impeller fouling
• Wet Installation – Suitable for fixed or portable sump setups (base plate sold separately)

SPECIFICATIONS

• Brand: Zenit Pumps
• Series: Grey – GRG
• Product Type: Submersible Grinder Sewage Pump
• Rated Power (P2): 5.5 kW / 7.5 HP
• Power Supply: 415 V (Three-phase, 50 Hz)
• Max Flow: 270 L/min
• Max Head: 43 m (4.3 bar / 430 kPa)
• Impeller Type: Multi-channel open impeller
• Grinder System: Rotary knife and counter-ring in hardened chromium steel
• Free Passage: 0 mm (due to integrated grinder)
• Discharge Port: G 2” BSPF (DN32 or DN40 optional)
• Pump Body & Impeller: Cast Iron EN-GJL 250
• Shaft Material: AISI 431 Stainless Steel
• Seals: Dual mechanical seals in SiC + V-ring
• Insulation Class: H
• Ingress Protection: IP68
• Max Liquid Temp: 40°C
• Fluid Density: ≤1100 kg/m³
• pH Range: 6 – 14
• Max Starts/Hour: 30
• Noise Level: <70 dB
• Installation: Wet (requires ZENS9024.006 ring stand for free-standing operation)
• Certification: Optional ATEX / IECEx depending on model variant

APPLICATIONS

• Remote or underground sewage pits
• Civil and municipal wastewater lift stations
• Agricultural and livestock effluent pumping
• Sludge handling in industrial plants
• Pumping into narrow or high-lift discharge pipes
• Areas with high fibre or solid content in sewage