Allweiler L40/3U2DW2 Centrifugal Pump 15kW 2905RPM

Allweiler L40/3U2DW2 Centrifugal Pump Assembly with 15kW, 2905 RPM Electric Motor

The Allweiler L40/3U2DW2 is a multistage horizontal centrifugal pump, heavy duty and high efficiency, for marine, offshore and industrial high pressure fluid handling systems. This pump unit is designed for the transport of fresh water, sea water, boiler feed water, condensate and light distillate oils with high head requirements and is connected to a 15 kW, 2-pole (2905 RPM at 50 Hz / up to 3500 RPM at 60 Hz) electric drive motor and equipped with a 3-stage hydraulic casing assembly.

Model Details

• Manufacturer: ALLWEILER GmbH (A CIRCOR Brand)
• Full Model Code: L 40 / 3 U2D-W2
• Pump Series: L-Series Multistage Centrifugal (Horizontal Ring-Section Type)
• Pump MPN: L40/3-U2DW2
• Motor Power Rating: 15.0 kW (20.0 HP)
• Motor Rated Speed: 2905 RPM (50 Hz Nominal) / 3500 RPM (60 Hz Compatible)
• IEC Frame Size: 160M / 160L (B3 Foot Mount or B35 Flange/Foot Mount, IP55/IP56 Marine Duty)
• Internal Hydro-Test Certification Code: PT-1.5x-ISO2548

Compatible Marine Main & Auxiliary Systems

• Engine Jacket Water Pre-Heating Systems: Compatible with MAN B&W (S50ME, S60ME, S70ME series) and WinGD / Wärtsilä (X62, X72, Flex50) engine cooling water loops.
• Boiler Feed Water Systems: Secondary feed pump for Alfa Laval Aalborg, KangRim, and Osaka boiler plants.
• Hydrophore & Sanitary Systems: High-pressure booster for freshwater supply skid units (CAT, Sperre, GEA).
• Reverse Osmosis (RO) Plants: Feed supply pump for high-volume marine desalination systems.

Part Number Cross-References

• Allweiler / CIRCOR Code: L40/3-U2DW2 / L40-3-U2D-W2
• Alternative Allweiler Executions: L40/3-U2D-W13 (Stainless Impellers), L40/3-U3D-W2
• Direct Equivalent Series: Allweiler LV 40/3 Series, KSB Movitec / Multitec 40-3, Sulzer / ABS Multistage Centrifugal equivalent frames.

Key Features

1. Bronze Impeller Hydraulics (W2 Code): Premium bronze impellers and diffusers provide immunity to galvanic pitting and biofouling in high-salinity seawater and brackish environments.
2. High Dynamic Head Capability: 3-stage modular casing stack efficiently generates heads up to 145 meters without requiring high motor speeds that lead to excessive wear.
3. Balanced Mechanical Seal Assembly (U2 Code): Features a self-flushing mechanical seal chamber design that eliminates external flushing lines and mitigates dry-running wear under transient operating conditions.
4. Heavy-Duty Bearing Frame: Oversized deep-groove ball bearings housed in rigid bearing brackets absorb all axial thrust loads from the multi-stage impeller array, extending operational life beyond 30,000 running hours.
5. Class F Marine Duty Motor Integration: 15 kW drive motor equipped with vacuum-pressure impregnated windings, tropicalization coating, and dual M40 cable gland entries for severe engine room environments.

Applications

• Marine Main Engine Auxiliary Cooling: High-pressure jacket fresh water circulation and LT/HT cooling circuits.
• Marine Boiler Feed & Condensate Handling: Delivering deaerated feed water into medium-pressure marine boilers.
• Freshwater Generation & RO Feed: Pressurized feed supply to reverse osmosis desalination systems.
• Hydrophore System Pressure Boosting: Maintaining stable line pressure across multi-deck accommodation freshwater networks.
• Offshore & Industrial Transfer: High-head washdown, fire-fighting auxiliary boosting, and cooling lubricant transfer in industrial plants.

Chief Engineer’s Field Note:

When installing or recommissioning an Allweiler L-series pump in an engine room, ignoring suction pipe line strain or priming procedures will ruin the mechanical seal within minutes. Pay close attention to suction head (NPSHa) and terminal jumpers.

Frequently Asked Questions

What does the model code Allweiler L40/3U2DW2 mean?

The model code denotes an Allweiler L-Series horizontal multistage centrifugal pump. L40 represents the suction/discharge frame size; /3 indicates 3 hydraulic impeller stages; U2 specifies an uncooled mechanical shaft seal; D designates a Cast Iron casing; and W2 specifies Bronze internal impellers and diffusers suitable for seawater or freshwater duty.

What electrical starter is required for the 15kW motor?

A 15kW motor can be started via Direct-On-Line (DOL), Star-Delta (Y-Δ), or a Variable Frequency Drive (VFD). Star-Delta or VFD starting is strongly recommended in shipboard networks to limit inrush current spikes on the auxiliary generator switchboard during motor startup.

Can this pump handle seawater applications?

Yes. Because this unit features the W2 material code (Bronze impellers and diffusers), it possesses excellent resistance to marine corrosion and galvanic attack, making it suitable for both seawater and freshwater applications.