IMO ACG 045N8 NKBP 100 STD Magnetic Coupling Pump With Motor

IMO ACG 045N8 NKBP 100 STD Magnetic Drive Triple Screw Pump Unit with Electric Motor

The IMO ACG 045N8 NKBP 100 STD is a positive displacement triple-screw pump unit fitted with a synchronous magnetic coupling (OptiLine Generation 8 series). Engineered for zero-emission fluid handling, this unit replaces dynamic mechanical shaft seals with a hermetically sealed containment shroud, eliminating shaft leakage, mechanical seal wear, and fluid crystallization in severe marine fuel and lubrication applications.

This complete motorized pump package is supplied factory-assembled on an alignment bracket with a premium efficiency 3-phase marine electric motor (4.0 kW @ 50 Hz / 4.7 kW @ 60 Hz).

Key Features

1. Hermetically Sealed Magnetic Coupling: Eliminates dynamic shaft seals via permanent neodymium-iron-boron (NdFeB) magnetic arrays inside a static containment shell, preventing fuel and lube leaks completely.
2. Low-Shear, Non-Pulsating Delivery: Three-screw continuous meshing (one power rotor and two idler rotors) yields laminar, pulsation-free displacement with minimal shear stress on sensitive polymers and fuels.
3. Built-in Spring-Loaded Relief Valve: Factory-fitted adjustable safety bypass valve prevents pump overload and piping damage during sudden downstream blockages (nominal range: up to 16 bar).
4. Robust Nodular Cast Iron Metallurgy: High-yield spheroidal graphite casing handles operating pressures up to 16 bar and thermal expansion spikes during heavy fuel switching without rotor binding.
5. Matched Motor & Frame Alignment: Factory-assembled with a vibration-damped bracket, ensuring magnetic gap tolerances are maintained without manual realignment.

Applications

• Marine Fuel Oil Systems: Main Engine (M/E) and Auxiliary Engine (A/E) booster units, feeder pumps, and circulation for MGO, LSMGO, VLSFO, and high-viscosity HFO.
• Heavy Lubrication Circuits: Forced lubrication systems for reduction gears, marine main engines, propulsion thrust bearings, and turbomachinery.
• Industrial Oil Circulation: Power plant turbine pre-lube, boiler heavy burner injection, hydraulic lift power units, and seal oil supply skids.
• Transfer & Bunkering: Ship-to-ship and onboard manifold bunker transfer across varying ambient temperatures and viscosity spectra.

Compatible Engines, Purifiers, & Marine Systems

• Marine Diesel Engines: MAN Energy Solutions 32/40, 48/60, 51/60DF; Wärtsilä 20, 26, 32, 38, 46; Caterpillar/MaK M25, M32C, M43C fuel booster modules.
• Fuel Conditioning Modules (FCM / FBO): Auramarine, Alfa Laval FCM, Westfalia Separator (GEA) fuel conditioning skids.
• Gearboxes & Turbo-machinery: Renk, Flender, Schottel propulsion units requiring uninterrupted positive oil circulation.

Part Number Cross-References

• IMO Original Code: ACG 045N8 NKBP 100 STD (SKU: ACG045N8NKBP)
• Legacy Generation Interchanges: ACG 045N7 NVBP (standard seal version), ACG 045N6, ACG 045K8 (low-lead variant)
• Magnetic Coupling Spare Kit: IMO P193037 / G098 series magnetic rotor kit
• Major Overhaul Gasket & O-Ring Set: IMO G057 maintenance kit

Frequently Asked Questions

What does “NKBP” stand for on an IMO ACG pump?

“N” denotes nodular cast iron pump body, “K” specifies a sealless magnetic drive coupling execution, “B” indicates standard IEC/DIN flange mounting, and “P” signifies an integrated spring-loaded relief valve.

Can this pump run in reverse rotation?

The standard ACG 045N8 is configured for clockwise (CW) rotation viewed from the motor shaft. Reversing rotation on a standard pump is strictly prohibited for normal duty; it will drain fluid away from the balancing piston and run the rotors dry against the rear thrust washer.

How do I inspect for magnetic drive slippage?

If the pump experiences a heavy load spike or foreign debris jamming the idler rotors, the inner and outer magnetic rings can slip out of synchronism. The motor will continue running at rated RPM while output flow drops to zero. If de-coupling occurs, trip the power immediately; running decoupled will rapidly overheat the containment shroud.

Does this pump require an external motor realignment upon installation?

Because the ACG 045N8 NKBP uses a machined spigot-fit intermediate bracket directly mating the IEC frame to the pump body, axial and radial alignment is set by the precision register. Ensure mating surfaces are thoroughly clean of grit, scale, or anti-corrosive paint during bolt-down.

What is the primary difference between IMO ACG standard and OptiLine ACG8?

The OptiLine ACG8 series incorporates a synchronous permanent magnetic coupling in place of the conventional elastomer bellows mechanical seal (NVBP/NTBP series). This provides a completely sealed system without wear-induced leakage paths, ideally suited for high-temperature heavy fuel oil and hazardous volatile media.