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SKU: 93209316
Grundfos NB 50-250/205 Cast Iron 15 kW End Suction Centrifugal Pump with Closed Impeller
Australia-Wide
(08) 9240 2992
Official Grundfos
Peace of Mind
Product Overview
Driven by a 15 kW electric motor, the NB 50-250/205 end-suction centrifugal pump features an axial suction port (DN 65) and a radial discharge port (DN 50). Specified for commercial HVAC circulation, district heating installations, and industrial process water distribution, the pump mounts securely onto floor inertia bases in mechanical plant rooms.
Hydraulic wet-end output delivers a rated flow volume of 1180 L/Min with a maximum operational head limit of 47.44 m. The EN-GJL-250 cast iron casing receives cataphoresis electrocoating to limit surface oxidation. Inside, a stainless steel impeller works alongside bronze wear rings and a BQQE shaft seal. Physical net weight measures 158 kg.
Electrical power for the NB 50-250/205 model is supplied by a 415 V three-phase electric motor rated at 15 kW output power. Nominal operating current draw measures 29.1 Amps during full load operations. Operating liquid temperatures span from -25°C to 120°C under 16 bar working pressure. Suction inlet measures DN 80 with a DN 50 discharge port.
Motor protection on the NB 50-250/205 pump complies with IP55 enclosure standards to resist dust and moisture ingress, supported by Class F thermal insulation and internal PTC thermistors. The back-pull-out casing layout allows service personnel to remove the motor drive and rotor assembly without unbolting the pump volute from system suction and discharge piping headers.
Features
- 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.
- Mechanical shaft seal can be replaced without removing the impeller, system piping, pump volute casing or drive motor from the installation.
- Housing, impeller and wear ring use dissimilar material pairings to prevent galling and ensure no sticking elements during extended standby periods.
- High-efficiency motor selection is configured to match the specific power supply characteristics, pumping environment and liquid properties of each installation.
IMPORTANT:Bulk freight charges apply. Please contact us for a freight quote before ordering.
SPECIFICATIONS
| Max Flow | 1180 L/Min |
| Max Head | 47.44 m |
| Power | 15 kW / 415v |
| Rated Current | 29.1 Amps |
| Suitable For | Commercial HVAC Hydronic Circulation |
| 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.
Within metropolitan heating facilities, what total dynamic lift capability is certified on site?
The foot-supported casing architecture of Grundfos NB 50-250/205 maintains a maximum dynamic head rating of approximately 47.44 m.
Discharging heavy liquid volume across campus loops, what maximum flow rate is delivered on site?
Through rigid end-suction volute passages, NB 50-250/205 sustains a peak liquid circulation rate of approximately 1180 L/Min.
What cast iron grade and rotating alloy are engineered into this flanged end-suction unit?
Erosion resistance in NB-50-250-205 is delivered by an EN-GJL-250 cast iron pressure volute fitted with a precision-cast bronze impeller.
What incoming electrical characteristics, line voltage, and full load current are specified on site?
Energy delivery to the rotating shaft in NB 50 250 205 is provided by a 15 kW motor on a three-phase 415 V line at 29.1 Amps.
During demanding thermal operation, what maximum fluid temperature and line pressure apply to this unit?
The mechanical envelope of NB/50/250/205 withstands media temperatures between -25°C to 120°C and working pressures up to 10 bar.
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