Leistritz L3MG 52/104 Triple Screw Pump

LEISTRITZ L3MG 52/104 TRIPLE SCREW PUMP

Leistritz L3MG 52/104 is a self-priming positive displacement triple screw pump for heavy duty industrial and marine applications. This unit is a member of Leistritz’s acclaimed L3M medium pressure series. This unit is intended for the treatment of non-abrasive lubricating fluids and exhibits excellent volumetric and mechanical efficiency. L3MG 52/104 with precision-ground power rotor and two matching idler rotors in a close-tolerance casing insert. For smooth, low-pulsation and low-noise fluid transfer even under constant high loads.

Model Details

• Brand: Leistritz
• Series: L3MG (Medium Pressure, Cased Design with Internal/External Bearing Configurations)
• Size Designation: 52/104
• MPN: L3MG-52/104

Key Features

1. Axially Balanced Rotor Geometry: Hydraulic forces are completely balanced, eliminating axial loads on the internal ball bearings and significantly extending operational lifecycle.
2. Interchangeable Casing Insert (MG Design): Simplifies maintenance by allowing internal component overhauls without requiring complete removal of the main suction and discharge piping.
3. Low-Pulsation & Silent Operation: Continuous, axial flow displacement eliminates fluid shearing, turbulence, and vibrational stress on connected pipe networks.
4. Single Shaft Seal Configuration: Optimized mechanical sealing arrangement located in the low-pressure chamber minimizes leakage risk and lowers routine service overhead.
5. Robust Construction: Nitrided, hardened, and ground alloy steel rotors built for harsh marine environments and round-the-clock industrial duty.

Technical Details: Leistritz L3MG 52/104 

Applications

• Marine main engine lube oil circulation and transfer
• Heavy Fuel Oil (HFO) booster and supply modules
• Crude oil and petroleum product pipeline transfer
• Petrochemical processing and refinery charge circulation
• Hydraulic and lubrication setups in heavy power generation plants

Compatibility

• Compatible Prime Movers: Standard electric motors (IE3/IE4 compliant via flexible coupling), marine diesel-driven PTO configurations.
• Matched System Frameworks: Leistritz pre-packaged skid assemblies, Alfa Laval / Framo fuel oil filtration and booster modules, standard marine engine room auxiliary skids.
• Interchangeable Spares: Direct replacement compatibility with designated L3MG series cartridge configurations and legacy 52/104 sizing matrices.

Part Number Cross-References

• Leistritz Internal Part ID: L3MG-52/104-SF
• Common Marine Ref. IDs: Leistritz L3M 52-104 Lube Pump, Triple Screw Fuel Booster Pump L3MG, ISO L3 Screw Pump Assembly.

Marine Engineer Expert’s Guide

Expert Insight: When dealing with high-viscosity residual fuels or heavy fuel oils (HFO) on the L3MG 52/104, fluid preheating is non-negotiable. Ensure your suction line temperature is regulated correctly to keep viscosity within the operational envelope (under 1,000 cSt at start-up) to prevent starving the internal screws and triggering dry-run wear.

1. Alignment Check: Because triple screw pumps operate with tight internal metallurgical clearances, angular and parallel misalignment between the motor and pump shaft will induce premature mechanical seal failure and bearing wear. Always use a dial indicator or laser alignment tool to verify alignment tolerances are within 0.05 mm prior to initial commissioning.
2. Dry Run Protection: Never operate this positive displacement pump dry, even for a few seconds. Ensure the suction isolation valves are fully cracked open, the casing is completely primed, and air pockets are bled using the casing vent plug prior to motor engagement.
3. Relief Valve Tuning: The L3MG series can be outfitted with an integrated pressure-limiting safety valve. Verify its bypass setting during hot oil circulation tests to protect downstream piping from over-pressurization during sudden valve closures.

Frequently Asked Questions

What is the primary function of the Leistritz L3MG 52/104 pump?

The Leistritz L3MG 52/104 is a positive-displacement triple screw pump engineered to transfer lubricating and non-abrasive fluids—such as lube oil, diesel, and heavy fuel oil—with high volumetric efficiency and minimal pulsation.

Can the L3MG 52/104 handle high-viscosity fluids?

Yes, it handles a comprehensive viscosity spectrum ranging from light distillates (1.2 cSt) up to heavy industrial fluids and viscous oils, provided the system suction pressure and fluid preheating parameters are correctly maintained.

How do I verify the correct direction of rotation during installation?

The standard direction of rotation for Leistritz L3 pumps is clockwise when facing the pump shaft end. Running the pump in reverse will collapse the hydraulic balance and must be strictly avoided.

Are replacement parts readily available for the L3MG 52/104 model?

Yes, major service elements including power rotors, idler rotors, mechanical seals, and O-ring service kits are fully interchangeable and stocked globally for rapid maintenance turnarounds.