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SKU: 93209297
Grundfos NB 50-125/144 Cast Iron 7.5 kW End Suction Centrifugal Pump with Closed Impeller
Australia-Wide
(08) 9240 2992
Official Grundfos
Peace of Mind
Product Overview
Operating with a 7.5 kW motor rating, the NB 50-125/144 end-suction centrifugal pump features end-suction axial inlet (DN 65) and top radial outlet (DN 50) connections. The pump is specified for district heating, commercial air conditioning loops, and industrial water distribution.
The pump's hydraulic assembly yields 1351 L/Min rated flow volume and a maximum operational head of 22.66 m. Structural strength relies on an EN-GJL-250 cast iron casing with cataphoresis coating. Internal hydraulics feature a stainless steel impeller and BQQE shaft seal. Physical product weight equals 111 kg.
The NB 50-125/144 pump's 415 V three-phase drive motor delivers 7.5 kW power output while drawing 14.3 Amps operating current. The pump accommodates circulating fluid temperatures from -25°C to 120°C under working pressures up to 16 bar. Standardized DN 65 suction and DN 50 discharge ports facilitate line placement.
An IP55 enclosure rating protects motor components on the NB 50-125/144 unit, backed by Class F insulation and built-in PTC thermistor sensors. Scheduled maintenance routines utilize back-pull-out access, enabling motor drive and impeller removal while leaving volute casing flange joints intact.
Features
- Cataphoretic electrocoating on cast iron internal surfaces provides barrier protection against oxidative corrosion in hydronic circulation loops.
- Close-coupled configuration eliminates coupling alignment procedures and reduces overall installation footprint compared to long-coupled alternatives.
- Ball bearing support arrangement accommodates both radial and axial thrust loads generated during continuous duty operation at rated speed.
- PN16 flanged connection ratings on sizes up to and including DN 150 provide elevated working pressure capability beyond standard EN733 10 bar ratings.
- O-ring seal between pump housing and cover eliminates leakage risk at the volute-to-cover joint under sustained operating pressures.
- Optimised impeller and volute hydraulics deliver unimpeded liquid flow through the pump casing, reducing internal turbulence losses.
- All stainless steel shaft construction provides improved corrosion resistance compared to carbon steel alternatives in wetted service areas.
IMPORTANT: Bulk freight charges apply. Please contact us for a freight quote before ordering.
SPECIFICATIONS
| Max Flow | 1350 L/Min |
| Max Head | 22.66 m |
| Power | 7.5 kW / 415v |
| Rated Current | 14.3 Amps |
| Suitable For | Boiler Plant & Thermal Transfer |
| Body Material | Cast Iron |
| Liquid Temperature | '-25°C to 120°C |
| Inlet Size | 65 mm |
| Outlet Size | 50 mm |
| Warranty | 24 Months |
Warranty & Returns
All products supplied by Foundation Pumps are covered by a minimum 12-month warranty unless otherwise stated. Some brands may offer longer manufacturer warranties. Warranty covers manufacturing defects, faulty materials and workmanship under normal use.
- Products must be installed correctly and in accordance with the manufacturer’s instructions.
- Warranty does not cover incorrect installation, misuse, dry running, normal wear and tear, unauthorised repairs or damage caused by external factors.
- Proof of purchase, photos, videos and installation details may be requested when assessing a warranty claim.
- The customer is responsible for returning the product to Foundation Pumps or the nominated service centre unless otherwise agreed.
- Removal, reinstallation, labour and associated site costs are generally the customer’s responsibility unless required under Australian Consumer Law.
- Change-of-mind returns may be accepted within 30 days provided the product is unused, uninstalled and returned in its original packaging.
- Customers are responsible for return freight costs for change-of-mind returns.
- Restocking fees may apply to special-order, bulky or non-stocked products.
- Used, installed or specially ordered products may not be eligible for change-of-mind returns.
- If a product arrives damaged or faulty, please contact Foundation Pumps as soon as possible so we can assist with the appropriate repair, replacement or refund.
Your rights under Australian Consumer Law are not affected.
What is the maximum water volume this pump can discharge?
Displacing fluid into connected headers, the Grundfos NB 50-125/144 sustains up to 1350 L/Min of volumetric throughput.
What metallurgy is selected for the pump body to resist abrasive wear?
Durable high-grade alloy construction gives the NB 50-125/144 exceptional structural strength and long-term protection against corrosive fluids.
What are the power requirements and running amperage for this pump?
Powered by a dedicated 7.5 kW motor, the NB-50-125-144 connects to 415 V three-phase mains power with a rated current draw of 14.3 Amps.
What liquid temperatures can this pump tolerate during standard operation?
Operating comfortably across temperatures -25°C to 120°C, the NB 50 125 144 supports diverse fluid circuits.
What is the maximum vertical lift capacity of this pump?
Under rated operating head, the NB/50/125/144 can lift water to a maximum dynamic head of approximately 22.66 m through vertical risers.
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