IMO E4 038N1 LRJE Triple Screw Pump

IMO E4 038N1 LRJE Triple Screw Pump

The IMO E4 038N1 LRJE is a rotary positive displacement triple screw pump designed for the most demanding maritime and industrial fluid handling systems and constructed for continuous operations. Using the proven three-screw method, the center power rotor drives two meshing idler rotors in a case with strict tolerances. Fluid pockets are cut off, which transmit media smoothly from suction to discharge without pressure pulsations. Internal hydraulic balancing mechanism fully eliminates axial and radial thrust forces on the power rotor so that the unit can be operated at high discharge pressures with only a minimum amount of mechanical wear and noise emissions.

Model Details

• Manufacturer: IMO AB / CIRCOR
• Product Series: E4 Medium Pressure Series
• Manufacturer Part Number (MPN): E4 038N1 LRJE
• Frame Size: 038
• Pump Configuration: Horizontal Foot/Flange Mount

Technical Specifications

Key Features

1. Hydraulically Balanced Rotors: Completely offsets axial and radial hydraulic loads on the power rotor and idlers, ensuring extended bearing service life.
2. Pulsation-Free Flow: Continuous internal displacement guarantees smooth, steady fluid delivery without pressure spikes or destructive harmonic vibrations.
3. DIN 24960 Mechanical Seal: High-integrity shaft sealing prevents external fluid leakage and handles moderate particulate or varnish tolerance.
4. High Volumetric Efficiency: Precision-machined screw profiles maintain tight internal clearances even at elevated operating temperatures and pressures.
5. Inline Serviceability: Modular casing design permits internal cartridge and seal replacement without disturbing main suction and discharge pipe flanges.

Industrial Applications

• Main engine forced lubrication and camshaft bearing oil supply skids
• Auxiliary diesel generator heavy fuel oil (HFO) and marine diesel oil (MDO) booster units
• Industrial steam and gas turbine lubrication and hydraulic governor control skids
• High-viscosity industrial hydraulic power units (HPUs) and test benches
• Bulk marine fuel oil transfer and burner feed systems

Compatible Equipment Models

• MAN B&W and Wärtsilä Two-Stroke/Four-Stroke Lube Oil Modules
• Alfa Laval Fuel Conditioning and Separation Skids
• Caterpillar / MaK Marine Propulsion Auxiliary Skids
• Cummins Marine Generator Skid Packages

Part Number Cross-References

• IMO E4 Family Variants: E4 038N1 LRBE, E4 038N1 YEBE, E4 038N1 LEJE
• Competitor Equivalents: Allweiler SPF/SPI Series, Leistritz L3NG Series, Bornemann W4SER Series

Frequently Asked Questions

What is the primary operational role of the IMO E4 038N1 LRJE pump?

It is a heavy-duty rotary positive displacement triple screw pump engineered to handle lubricating oils, hydraulic fluids, and fuel oils under medium-to-high pressure industrial and marine conditions.

Can this pump handle synthetic ester-based oils?

Yes, provided that the internal elastomer materials (such as Viton or specialized NBR compounds) specified for your specific serial build are chemically compatible with the synthetic fluid formulation.

What causes a drop in discharge pressure during operation?

Pressure drops typically stem from excessive internal wear due to contaminated fluid, worn mechanical seals letting air into the suction line, or a partially blocked suction strainer causing oil starvation and cavitation.

How does the hydraulic balancing system protect the pump?

High-pressure discharge fluid is routed internally against balancing pistons at the end of the power rotor, completely neutralizing axial thrust forces and ensuring that internal bearings only manage radial loads.