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SKU: 93209322
Grundfos NB 50-250/263 Cast Iron 37 kW End Suction Centrifugal Pump with Closed Impeller
Australia-Wide
(08) 9240 2992
Official Grundfos
Peace of Mind
Product Overview
Operating with a 37 kW motor rating, the NB 50-250/263 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 1618 L/Min rated flow volume and a maximum operational head of 80.01 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 290 kg.
The NB 50-250/263 pump's 415 V three-phase drive motor delivers 37 kW power output while drawing 68.1 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 50-250/263 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
- 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).
- Integrally cast suction and discharge ports with dedicated vent and drain ports provide direct connection points without additional fittings.
- 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.
IMPORTANT:Bulk freight charges apply. Please contact us for a freight quote before ordering.
SPECIFICATIONS
| Max Flow | 1618 L/Min |
| Max Head | 80.01 m |
| Power | 37 kW / 415v |
| Rated Current | 68.1 Amps |
| Suitable For | Commercial Chilled Water 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 plant distribution pipework, which operating fluid temperatures and pressures are certified on site?
Hydraulic parameters allow fluid temperatures between -25°C to 120°C to be conveyed by Grundfos NB 50-250/263 up to a line pressure limit of 16 bar.
Across heavy mechanical distribution loops, what total dynamic elevation height is achieved?
Overcoming elevation resistance across expansive municipal mains, NB 50-250/263 delivers a maximum dynamic lift of approximately 80.01 m.
With large flanged pipe connections, how many liters per minute can this baseplate pump circulate?
Supporting heavy primary transmission loops, NB-50-250-263 achieves a peak volumetric flow of approximately 1618 L/Min.
What metallurgy specifications govern the pressure volute and fluid-directing closed impeller?
Superior casing metallurgy in NB 50 250 263 is established by an EN-GJL-250 cast iron volute alongside a durable stainless steel impeller.
Under maximum rotational load, what motor wattage, electrical feed, and amps are drawn on site?
Site distribution networks must supply a three-phase 415 V feed to run the 37 kW motor of NB/50/250/263 at 68.1 Amps.
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