NBS / NBSE Split Coupled Pumps

Split-coupled End-suction pumps with NEMA standard motors & NEMA MLE motor models with ANSI flange fittings.

The N-series offers three different end-suction models: the frame-mounted NK, close-coupled NB and split-coupled NBS.

The N-series delivers industry leading efficiencies that future-proof them against government efficiency regulations. The NBS is designed to bring faster installation, greater efficiency and reliability, along with easier serviceability throughout the pump’s life. With up to a 35% smaller footprint, Lifetime Alignment Guarantee, back pull out design and a new and revolutionary hard-faced seal designed to improve reliability and reduce service costs, the NBS delivers on our promise that HVAC from Grundfos — it’s everyone’s comfort zone. The Grundfos

NBSE split-coupled, end-suction pump with integrated permanent magnet motor, drive, and control serves as the industry standard in performance, quality, and durability. These products allow for dynamic and intelligent solutions to many commercial building and industrial applications. With a selection of forty-one sizes available, the NBSE provides all the benefits of an NBS pump, enhanced by a high-efficiency permanent magnet motor and variable frequency drive, manufactured by Grundfos.

The Grundfos MLE permanent magnet motor with integrated variable frequency drive exceeds IE5 efficiency levels set by the International Electrotechnical Commission (IEC), currently the highest efficiency worldwide for electrical motors. NEMA Premium Efficient motors are equivalent to IE3, meaning these MLE motors are two levels above NEMA Premium Efficiency. The combined motor and VFD efficiency is higher than a NEMA Premium motor alone.

Applications

• Agricultural surface water
• HVAC: Air Conditioning
• HVAC: Heating
• Plumbing: Hot Water Recirculation
• Plumbing: Pressure Boosting
• District cooling
• District heating
• Irrigation
• Cooling
• Desalination
• Industrial heating
• Machining
• Process liquids transfer
• Industrial process water treatment
• Wash and clean
• Industrial wastewater treatment & reuse
• Municipal water transportation

Split-coupled End-suction pumps with NEMA standard motors and ANSI flange fittings

Applications

Installation

• No baseplate or grouting required reducing installation costs
• No alignment required between the pump and motor with our Lifetime Alignment Guarantee — eliminating laser alignment costs and reducing installation time
• Optimized, space-saving design has up to a 35% smaller footprint compared to traditional frame-mounted design pumps
• Top centerline discharge design allows for self-venting and more compact piping designs

Efficiency and Reliability

• Industry leading efficiencies you can count on, because of advanced Computational Fluid Dynamics (CFD)
• New Silicon Carbide (SiC) / Silicon Carbide (SiC) hard faced seal's robust design offers increased temperature range, better abrasives handling and longer life versus standard designs (standard on all N-Series pumps)
• Backed by our Lifetime Alignment Guarantee so you never have to worry about undue wear and tear on mechanical seals, bearings and energy losses due to misalignment
• Optimized, stainless-steel impeller design increases efficiency and reduces NPSH required
• Balanced impellers reduce noise and vibration for quiet operation and prolong seal and bearing life
• 4" and above models have a internal dual-volute design for increased efficiency, lower life-cycle costs and prolonged seal and bearing life 
• Integrally cast diffuser vane reduces turbulence

Serviceability

• Foot-mounted volute for increased pump stability
• Spacer-coupling design allows for back pull-out and easy access to mechanical seal without removing the motor or disturbing piping