Roll over image to zoom
SKU: 93209324
Grundfos NB 50-315/344 Cast Iron 11 kW End Suction Centrifugal Pump with Closed Impeller
Australia-Wide
(08) 9240 2992
Official Grundfos
Peace of Mind
Product Overview
Building HVAC water circuits and secondary circulation skids deploy the Grundfos NB 50-315/344 centrifugal pump. Coupled to a 11 kW motor drive, fluid enters through an axial DN 65 suction port and exits through a radial DN 50 discharge flange.
Operational discharge rate reaches approx. 841 L/Min liquid flow while developing approx. 44.2 m maximum head. Constructed with an EN-GJL-250 cast iron volute protected by cataphoretic electrocoating, internal hydraulics feature a stainless steel impeller and BQQE mechanical shaft seal. Net weight is 229 kg.
Connected across a 415 V three-phase circuit, the 11 kW motor draws 22.3 Amps under operating conditions. Working tolerances accommodate fluid temperatures spanning -25°C to 120°C at pressures reaching 16 bar. Flanged connections feature DN 65 inlet and DN 50 outlet dimensions.
Motor casing engineering satisfies IP55 enclosure requirements with Class F thermal insulation. Because built-in thermal protection is not included, external motor overload protection must be supplied. Maintenance is streamlined via a back-pull-out arrangement allowing rotating element removal while the casing remains connected to piping.
Features
- Cast iron volute casing with integral mounting feet absorbs hydraulic forces and pipework stresses.
- Replaceable wear rings retain correct internal hydraulic clearances over long operating periods.
- Solid stub shaft configuration supported by deep groove ball bearings absorbs axial thrust loads.
- Standardized EN1092-2 PN16 flange dimensions match standard commercial and district pipe manifolds.
- High-efficiency IEC electric drive motor maximum flow of S1 continuous operation in ambient conditions up to 40°C.
- Back-pull-out construction allows drive and impeller removal without disconnecting suction or discharge lines.
- Precision balanced rotor and runner assemblies minimize operating vibration across all pump speeds.
SPECIFICATIONS
| Max Flow | 841 L/Min |
| Max Head | 44.2 m |
| Power | 11 kW / 415v |
| Rated Current | 22.3 Amps |
| Suitable For | District Heating & Cooling Networks |
| 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 alloys make up the pump volute casing and internal mechanical seal?
Corrosion-resistant construction on the Grundfos NB 50-315/344 features an electrocoated EN-GJL-250 cast iron volute and a stainless steel impeller.
How broad is the fluid temperature range supported by this pump?
The NB 50-315/344 safely accommodates pumped fluid temperatures from -25°C to 120°C under working pressure limits up to 16 bar.
How does the pump construction minimize downtime during routine maintenance?
Extracting the rotating assembly on the NB-50-315-344 requires no pipe disconnection, thanks to its back-pull-out maintenance architecture.
How much liquid circulation and vertical lift does this pump provide?
Operating capacity on the NB 50 315 344 reaches approx. 841 L/Min in liquid flow and approx. 44.2 m in dynamic head across duty cycles.
What motor power rating and running current operate this pumping unit?
The NB/50/315/344 is driven by a 11 kW motor running on a 415 V three-phase supply, drawing approximately 22.3 Amps with IP55 protection.
Need help choosing the right pump?
Our team of pump experts are here to help you find the perfect solution for your application.
- Free expert advice
- Pump sizing & system recommendations
- Fast response — call or email us