Allweiler SPF10R46G8.3F-W20 Triple Screw Pump

Allweiler SPF10R46G8.3F-W20 Triple Screw Pump (Pressure Tested)

The Allweiler SPF10R46G8.3F-W20 is a self-priming three-screw positive displacement pump engineered specifically for handling chemically neutral, lubricating fluids free of abrasive contaminants. As an essential workhorse aboard sea vessels and within critical land-based plants, this unit delivers low-pulsation, continuous liquid transfer across broad temperature and viscosity profiles.

Every pump in our inventory undergoes complete mechanical tear-down, clearance verification, seal replacement, and multi-stage hydrostatic/dynamic pressure bench testing. Whether deployed for marine diesel booster systems, fuel forwarding, burner supply, or hydraulic circulation, the SPF10 series guarantees stable hydraulic delivery with minimal cavitation risks under rated suction conditions.

Pump Features

1. Pulsation-Free Hydraulic Profile: The intermeshing triple-screw configuration generates sealed chambers moving axially from suction to discharge without fluid churning, turbulence, or pressure spiking.
2. Internal Fluid-Lubricated Sleeve Bearing: Eliminates the need for external grease/oil lubrication ports; the pumped medium cushions internal radial thrust loads.
3. Balanced Mechanical Seal (Design 8.3): Engineered to prevent weeping under high inlet backpressures or thermal cycling up to 150°C.
4. Compact IEC Direct-Coupling: Foot and IEC flange mounts mate seamlessly with standard B5/B35 electric motor frames (IEC 71 / 80 / 90).

Technical Details

Compatible Machinery & Auxiliary Systems

• Marine Diesel Engines: Auxiliary generator engine lube priming and fuel oil boosting for MAN B&W (L16/24, L21/31), Wärtsilä (V20, L20), Yanmar (EY18, EY26), Daihatsu (DK, DE series).
• Boiler Supply Modules: Aalborg, Miura, and Saacke marine oil-fired auxiliary boiler burner feed and recirculation loops.
• Separator / Purifier Feed Modules: Alfa Laval (S/P-Flex series), GEA Westfalia (OSD/OSC series) fuel and mineral oil forwarding units.
• Deck & Hydraulic Machinery: Steering gear continuous servo-pilot oil circulation, marine winch gear head lubrication.

Part Number Cross-References

• Allweiler: SPF10R46G8.3-W20 | SPF 10 R 46 G8.3 | SPF10R46 | SPF10-46
• IMO Equivalent Form-Factor: ACE 025L2 / ACE 025N2 (nominal displacement check required)
• Kral Equivalent Class: KF-16 / KF-20 / KFT-20 series

Industrial Applications

• Marine Fuel Oil Booster Modules: Supplying Marine Gas Oil (MGO), Low Sulfur Heavy Fuel Oil (LSHFO), and Marine Diesel Oil (MDO) to high-pressure injection pumps.
• Gearbox and Turbine Bearing Lubrication: Delivering consistent oil film pressures to marine reduction gears and industrial turbochargers.
• Hydraulic Elevator & Servo Systems: Operating in closed-loop systems requiring dead-silent, ripple-free fluid power.
• Industrial Burner & Furnace Feeding: Supplying steady, non-fluctuating fuel streams directly to burner nozzles.
• Centrifuge & Waste Oil Transfer Units: Pumping hot, conditioned lubricants and engine drain oil without foaming.

Frequently Asked Questions

Can this pump handle Heavy Fuel Oil (HFO) as well as Marine Gas Oil (MDO)?

Yes. The Allweiler SPF10R46G8.3F-W20 is rated for viscosities between 3 and 760 mm²/s. When running light distillate fuels like MDO or ultra-low sulfur diesel (ULSFO), ensure fluid temperature does not reduce operating viscosity below 3 mm²/s to maintain internal hydrostatic film lubrication on the idler screws.

What is the primary difference between SPF and SPF-M models?

The standard SPF series incorporates an internal bearing lubricated entirely by the fluid pumped, maintaining a compact footprint. The SPF-M variant uses a magnetic coupling for hermetically sealed applications handling toxic, highly volatile, or foul-smelling fluids where gland emissions must be strictly zero.

What does “Pressure Tested” mean in your reconditioning process?

Every pressure-tested unit is clamped to an automated hydraulic test stand. The casing undergoes a static casing test at 24 bar to verify seal integrity, followed by a running dynamic load test under ISO VG 46 test oil at normal working temperatures to measure flow delivery against backpressure.

How do I check if my existing motor flange will mate with this pump?

The SPF10 series typically mounts to standard IEC 71 or IEC 80/90 B5 motor flanges via an Allweiler intermediate lantern ring/bracket. Measure your motor’s bolt circle diameter (PCD), pilot diameter, and shaft extension before ordering, or provide your motor nameplate specs to our engineering team for validation.

What happens if the pump rotates in reverse?

The “R” in the model code indicates clockwise rotation. Running the pump counter-clockwise will invert fluid flow if check valves do not prevent it, but more critically, it will starve the internal balance piston of pressure, causing axial idler screw binding and mechanical seal failure within minutes. Always verify rotational direction with a motor jog before permanent startup.