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SKU: 93209319
Grundfos NB 50-250/233 Cast Iron 22 kW End Suction Centrifugal Pump with Closed Impeller
Australia-Wide
(08) 9240 2992
Official Grundfos
Peace of Mind
Product Overview
Featuring an end-suction structural layout with DN 65 axial suction and DN 50 radial discharge ports, the NB 50-250/233 pump processes clean liquid media across active HVAC circuits. Powered by a 22 kW electric motor, the system operates across continuous commercial pumping cycles.
The hydraulic wet-end achieves a rated flow capacity of 1317 L/Min with a maximum head rating of 63.43 m. Cast iron housing materials provide solid pressure containment up to 16 bar. The internal assembly houses a stainless steel impeller fitted with bronze wear rings. Net equipment weight is 218 kg.
Power specifications for the NB 50-250/233 end-suction pump call for a 415 V three-phase electrical supply rated at 22 kW motor power. Current draw under load measures 40.8 Amps. Operating fluid temperatures span -25°C to 120°C with a maximum working pressure rating of 16 bar. The housing features DN 65 axial suction and DN 50 radial discharge ports.
The NB 50-250/233 electric motor carries an IP55 ingress protection rating alongside Class F thermal insulation and integrated PTC thermistors. System maintenance relies on back-pull-out architecture, enabling drive head disassembly while the pump volute stays secured to concrete foundation bases and pipe runs.
Features
- 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.
- Back pull-out design allows complete rotating assembly removal including motor, coupling and impeller without disturbing pump housing or connected pipework.
- EN733 and ISO2858 dimensional compliance ensures interchangeability with other standard end-suction pumps across commercial and industrial installations.
- ATEX Zone 1, 2, 21 or 22 certification available for operation in potentially explosive atmospheres (except E-model variants).
IMPORTANT:Bulk freight charges apply. Please contact us for a freight quote before ordering.
SPECIFICATIONS
| Max Flow | 1317 L/Min |
| Max Head | 63.43 m |
| Power | 22 kW / 415v |
| Rated Current | 40.8 Amps |
| Suitable For | High-Capacity Plant Room Pumping |
| 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.
Which materials of construction provide mechanical strength across this heavy-duty pump body?
The heavy-duty pressure envelope of Grundfos NB 50-250/233 integrates an EN-GJL-250 cast iron body with a precision-cast bronze impeller.
Across site electrical panels, what power consumption and running amperage define this heavy drive?
The electric motor fitted to NB 50-250/233 delivers 22 kW of mechanical power across a three-phase 415 V line drawing 40.8 Amps.
Across district distribution loops, what media temperature boundaries and working pressure apply on site?
Broad temperature support in NB-50-250-233 spans fluid operating ranges of -25°C to 120°C, containing working pressures up to 16 bar.
Discharging fluid through flanged end-suction volutes, how high can this unit propel media?
Supporting heavy floor-mounted piping networks, NB 50 250 233 achieves a peak dynamic elevation of approximately 63.43 m.
Under maximum system volumetric demand, what peak volumetric flow is maintained across pipework?
Delivering high volumetric fluid momentum, NB/50/250/233 discharges a maximum liquid volume of approximately 1317 L/Min.
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