IMO D4 032L2 LRBE A333 Triple Screw Pump

IMO D4 032L2 LRBE A333 Triple Screw Pump (Unused Surplus / New) – MPN 447563

The IMO D4 032L2 LRBE A333 (Manufacturing Part Number: 447563) is an industrial-grade, positive displacement, three-screw rotary pump engineered for continuous, pulse-free fluid delivery in high-demand marine auxiliary machinery and industrial lubrication systems. Manufactured under the high-precision engineering standards of IMO AB Sweden, the D4 generation utilizes a hydraulically balanced three-rotor geometry: one central power rotor driven directly by the prime mover, which hydrodynamically meshes with and rotates two symmetric idler rotors.

This specific variant features an aluminum casing configuration (L), mechanical shaft sealing with Nitrile (NBR) elastomers (R), standard bellhousing flange execution (B), and an external circuit without a built-in relief valve (E), tailored under modification code A333 for marine auxiliary boiler booster and high-pressure turbine lubrication services.

Technical Details:

Features

1. Steep-Lead Positive Displacement: The low-lead configuration produces high head pressures (up to 160 bar) at lower RPMs with minimal internal slip, even on low-viscosity fuels like Marine Gas Oil (MGO) and Light Marine Diesel (MDO).
2. High-Precision Nitrided Alloy Spindles: Surface-treated steel power rotor meshed with precision-ground idlers provides wear resistance against thermal cycling and micro-abrasives.
3. Precision Aluminum Pump Body Construction: Delivers high heat dissipation and corrosion protection while maintaining a lightweight footprint for marine baseplates and skid modules.
4. Zero Pulsation Fluid Transfer: Rotary screw delivery eliminates pressure pulsations and pipe hammer common in reciprocating pumps, protecting flowmeters, burner tips, and sensitive hydraulic valves.

Direct Engine & Equipment Matching

• Marine Burners: SAACKE SKVJ / KFB series, Aalborg Mission (OS, D-Type), Oilon marine units.
• Auxiliary Generating Sets: Wärtsilä, MAN B&W, Daihatsu, Yanmar marine auxiliary lube and fuel feeding circuits.
• Turbomachinery: Siemens, Peter Brotherhood, and Kawasaki marine turbo-generator feed loops.

Frequently Asked Questions

What does the “LRBE” code mean on this IMO D4 pump?

In IMO pump nomenclature, “L” stands for an aluminum body construction, “R” designates a mechanical face shaft seal with Nitrile (NBR) elastomers, “B” indicates a flange-mounted bellhousing body, and “E” means the internal relief valve is excluded.

Does this pump have a built-in pressure relief valve?

No. The “E” designation specifies that this unit does not incorporate an internal pressure relief valve. An external relief valve piped back to the supply tank must be installed in the discharge pipeline to safeguard equipment against over-pressurization.

Is the rotation of this pump reversible?

No. The standard D4 032L2 is designed exclusively for clockwise (CW) rotation as viewed from the drive shaft end. Operating in counter-clockwise (CCW) rotation without a dedicated CCW internal rotor kit (G011) will fail to supply hydrodynamic oil to the internal balance surfaces, causing premature failure.

What is the difference between model codes LRBE and LVBE?

The sole difference is the elastomer material within the mechanical shaft seal and body gaskets. “LRBE” uses Nitrile (NBR) elastomers (rated up to +90°C), while “LVBE” utilizes Viton/Fluorocarbon (FKM) elastomers, which extend temperature tolerances up to +130°C.