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SKU: 93209280
Grundfos NB 40-250/255 Cast Iron 22 kW End Suction Centrifugal Pump with Closed Impeller
Australia-Wide
(08) 9240 2992
Official Grundfos
Peace of Mind
Product Overview
Operating with a 22 kW motor rating, the NB 40-250/255 end-suction centrifugal pump features end-suction axial inlet (DN 65) and top radial outlet (DN 40) connections. The pump is specified for district heating, commercial air conditioning loops, and industrial water distribution.
The pump's hydraulic assembly yields 1092 L/Min rated flow volume and a maximum operational head of 78.54 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 218 kg.
The NB 40-250/255 pump's 415 V three-phase drive motor delivers 22 kW power output while drawing 40.8 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 40 discharge ports facilitate line placement.
An IP55 enclosure rating protects motor components on the NB 40-250/255 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
- No baseplate or grouting required to maintain correct shaft alignment and vibration levels within Hydraulic Institute standards.
- 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.
IMPORTANT:Bulk freight charges apply. Please contact us for a freight quote before ordering.
SPECIFICATIONS
| Max Flow | 1092 L/Min |
| Max Head | 78.54 m |
| Power | 22 kW / 415v |
| Rated Current | 40.8 Amps |
| Suitable For | Commercial Chilled Water Circulation |
| Body Material | Cast Iron |
| Liquid Temperature | '-25°C to 120°C |
| Inlet Size | 65 mm |
| Outlet Size | 40 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 engineering materials protect the wet end components against cavitation and hydraulic wear?
Internal pressure containment in Grundfos NB 40-250/255 relies on an EN-GJL-250 cast iron casing equipped with a durable stainless steel impeller.
Across regional plant substations, what electrical supply feed and full load current run this machine?
Operating with balanced three-phase loading, NB 40-250/255 features a 22 kW drive running on a three-phase 415 V line at 40.8 Amps.
Under maximum line pressure, what media temperature spectrum can this heavy end-suction pump accommodate?
System operators can circulate fluids from -25°C to 120°C through NB-40-250-255 while maintaining safe containment up to 10 bar.
Across sprawling campus distribution mains, what dynamic elevation column does this pump achieve?
Across regional district heating mains, NB 40 250 255 maintains an operational elevation column of approximately 78.54 m.
Delivering high volumetric liquid velocity, how many liters per minute does this flanged pump move?
Across expansive municipal distribution headers, NB/40/250/255 maintains a peak volumetric throughput of approximately 1092 L/Min.
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