IMO GR Series Low Pressure Screw Pump | GR20 to GR80 Replacement

Genlu Hydraulic proudly introduces our GR Series three-screw pumps, engineered specifically for demanding low-pressure industrial applications such as lubrication circulation, fuel delivery, and industrial hydraulic power systems. This series is a precise match for IMO technical specifications, comprehensively covering the GR20 through GR80 size ranges, and ensuring perfect compatibility for specific configurations like the GR55 SMIT 16B 380L. Genlu unequivocally guarantees 100% Drop-in Interchangeability in mounting flanges, input shaft dimensions, port diameters, and internal pressure-compensation logic. Backed by our uncompromising 100% Simulation Load Testing, each unit is validated for volumetric efficiency under various viscosities, operational noise levels, and mechanical seal integrity before dispatch, ensuring relentless, pulsation-free, and highly efficient fluid delivery for your critical operations.

Technical Specifications

• Product Series: IMO GR Series Three-Screw Pump

• Representative Models: GR20, GR55 (including SMIT 16B 380L), GR80

• Flow Range: 10 L/min to 800+ L/min (Model & Speed dependent)

• Max Operating Pressure: 10 – 16 bar (Low pressure)

• Speed Range: 1450 – 3600 rpm (Viscosity-dependent)

• Structural Configuration: Three-screw design (1 power, 2 idler), mechanical seal

• Fluid Compatibility: Lube oils, fuel oils, hydraulic oils, and other lubricating fluids

Key Technical Advantages:

• Pulsation-Free Delivery: The unique mesh structure of the three-screw design ensures continuous axial movement of the fluid. This effectively eliminates the flow pulsation typical of gear pumps, ensuring constant pressure at downstream lubrication points.

• Whisper-Quiet Operation: Precision machining of the screw helix drastically reduces turbulence-induced noise. The pump operates with minimal vibration, making it ideal for noise-sensitive environments like marine engine rooms or industrial workshops.

• Self-Lubricating Architecture: The screw assembly is cooled and lubricated by the pumped medium itself, eliminating the need for external grease injection. High-hardness alloy construction significantly enhances resistance against cavitation and abrasive particle wear.

• Modular Mechanical Seal: Designed with a modular mechanical seal solution for durability and easy maintenance. It prevents shaft leakage effectively, keeps equipment environments clean, and allows for seal component replacement without requiring the disassembly of the entire pump assembly.

Application Areas:

• Marine Propulsion Systems: Fuel transfer pumps and main/auxiliary engine lube oil circulation pumps.

• Industrial Lube Stations: Lubrication and cooling circulation for large gearboxes and turbine units.

• Hydraulic Systems: Low-pressure auxiliary supply and oil circulation/filtration loops.

• Power Equipment: Transformer insulation oil circulation and generator set auxiliary pumping.

Expert Maintenance Tips:

• Strict No-Dry-Run Policy: Ensure the pump chamber is primed with medium before start-up. Dry operation causes the protective oil film between screws to vanish, leading to metal-to-metal contact and instant damage to the sealing surfaces.

• Pressure Relief Requirements: Although the GR series is a low-pressure pump, always install a bypass relief valve in the discharge line. If the outlet is blocked, pressure buildup will damage the screws and housing; the relief valve acts as the primary safety barrier.

• Filtration Protocols: The clearance between the screws and the housing is minimal; large contaminants can cause seizure. We recommend a 60-100 mesh coarse filter on the suction port to prevent metal chips or large particulates from jamming the screw assembly.