ALLWEILER AFI10R46D19USW226 Three-Screw Pump

ALLWEILER GmbH AFI10R46D19USW226 Screw Pump

The ALLWEILER AFI10R46D19USW226 is a three-screw, self-priming positive displacement pump engineered specifically for heavy fuel oil (HFO), marine gas oil (MGO), low-sulfur marine gas oil (LSMGO), and thermal/lube oil applications. Designed as part of the specialized ALLFUEL® AFI series by ALLWEILER GmbH (a CIRCOR brand), this pump delivers low-noise, pulsation-free hydraulic fluid displacement across marine booster modules, auxiliary boiler burner systems, and burner injection lines.

Operating with an internal plain bearing design lubricated directly by the pumped fluid, the unit features an exchangeable casing insert and precision-machined nitrided spindle screws. The hydraulic balancing piston neutralizes axial forces on the main drive spindle, preventing direct metal-to-metal friction on the thread flanks and drastically reducing operational wear even during continuous duty under high dynamic head conditions.

Model Details:

• Manufacturer Part Number (MPN): AFI10R46D19USW226
• Series: AFI (ALLFUEL® Injection / Booster Series)
• Size: 10 (Nominal rotor displacement volume)
• Rotation / Direction: R (Right-hand / clockwise rotation viewed from drive shaft end)
• Spindle Pitch Angle: 46° (Steep pitch engineered for optimized volumetric throughput at standard synchronous motor speeds)
• Casing / Configuration Execution: D (Direct-coupled / foot-flange insert design with integrated pressure relief circuit)
• Shaft Seal Code: 19US (Unbalanced, uncooled, maintenance-free mechanical shaft seal with Silicon Carbide vs. Silicon Carbide friction faces and FPM/Viton elastomers)

Technical Specifications

Equipment Compatibility

• The AFI10R46D19USW226 is factory-specified and field-proven across maritime and thermal equipment, including:
• Marine Oil Burners: Oilon Marine (GP/RP burner series), Saacke (SKVJ, TEM, KFB series), Weishaupt Industrial Monarch series.
• Booster Feeder Units: Auramarine HFO/MDO fuel supply modules, Alfa Laval FCM (Fuel Conditioning Modules), Kanon, and Boll & Kirch feeder racks.
• Auxiliary Boiler Feed Systems: Aalborg / Alfa Laval Mission OL/OS/OC boilers, KangRim heavy oil boilers, and Miura auxiliary steam boilers.
• Marine Power Systems: Auxiliary diesel generator fuel supply skids (MAN B&W, Wärtsilä, Yanmar, Daihatsu).

Part Number Cross-References & Supersessions

• AFI 10R46 G19US W198 (Standard plain bearing predecessor; W226 replaces W198 directly)
• AFI 10R46 D19US W198 (Previous revision direct replacement)
• AFI 10R46 W228 (Direct equivalent revision)
• AFI 10R46 G19US W196 / W195 (Superseded mechanical seal iterations)
• Oilon Part Number Cross-Reference: Oilon 30 bar / 40 bar AFI 10R46 replacement units

Applications

• Boiler Burner Injection: High-pressure oil atomization and circulation pump for marine auxiliary, composite, and exhaust gas boilers.
• Fuel Oil Booster & Feeder Modules: Constant pressure supply of MDO, MGO, and preheated HFO (up to 150°C) to 2-stroke and 4-stroke marine propulsion engines.
• Thermal Fluid Circulation: Pressurized booster circulation of heat transfer oils and high-viscosity lubricants in industrial plant skids.
• Hydraulic Pressure Systems: Low-pulsation pilot oil pressure generation in heavy industrial electro-hydraulic control packages.

Frequently Asked Questions

What is the difference between ALLWEILER AFI and ALLFUEL SPF series pumps?

The AFI series is designed specifically as an injection and burner booster pump capable of operating at continuous pressures up to 40 bar with compact direct-flange integration. The SPF series typically targets lower-pressure transfer, feeder, and general lubrication duties up to 16 bar.

Can the AFI10R46D19USW226 handle ultra-low sulfur marine gas oil (LSMGO)?

Yes. The W226 execution with 19US mechanical seal (SiC/SiC friction faces and FPM elastomers) is certified down to 3.0 cSt viscosity, allowing trouble-free service on low-lubricity marine distillate fuels without supplementary cooling.

What does the pitch angle “46” denote on the pump nameplate?

The “46” indicates a 46-degree spindle thread flank pitch angle. This steep angle allows high volumetric displacement per shaft rotation compared to 38-degree screws, optimizing motor footprint and pump efficiency at standard 2-pole synchronous speeds.

Why is my ALLWEILER screw pump leaking slightly around the seal chamber?

A minute dynamic leakage rate of 1 to 3 drops per hour is normal for high-pressure SiC mechanical seals during steady-state operation. This standard controlled film maintains the hydraulic seal between the faces. If continuous dripping or spraying occurs, the seal faces or O-rings have degraded and require immediate replacement.

Can I run the AFI10R46 pump in reverse to strip a line?

No. The AFI10R46 is a unidirectional pump configured for clockwise (R) rotation. Operating the unit in reverse will starve the mechanical seal return passage, pressurize the seal chamber beyond safe limits, and destroy the shaft seal within seconds. Ensure rotational arrow verification prior to motor terminal connection.