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SKU: 93209301
Grundfos NB 50-160/139 Cast Iron 0.75 kW End Suction Centrifugal Pump with Closed Impeller
Australia-Wide
(08) 9240 2992
Official Grundfos
Peace of Mind
Product Overview
Hydronic transfer stations and building service manifolds deploy the Grundfos NB 50-160/139 centrifugal pump. Coupled to a 0.75 kW motor drive, fluid enters through an axial DN 65 suction port and exits through a radial DN 50 discharge flange.
Fluid movement rating attains 584 L/Min volumetric capacity and develops 5.164 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 43 kg.
Operating across a 415 V three-phase power line, the drive requires 1.6 Amps to develop 0.75 kW output. 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.
Drive housing integrity meets IP55 ingress specifications 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
- Totally enclosed fan cooled IEC motor rated for S1 duty cycles in ambient environments up to 40°C.
- Service-friendly back-pull-out layout enables rotating element servicing without removing pipework.
- Balanced impeller geometry and shaft construction reduce operational vibration throughout duty range.
- Volute casing design incorporates integral base feet for direct mounting to concrete plinths.
- Internal wear rings retain hydraulic clearance tolerances throughout long service cycles.
- Solid stub shaft supported by sealed ball bearings carries axial and radial loads.
- Standard PN16 flanged port interfaces align with EN1092-2 heating and cooling headers.
SPECIFICATIONS
| Max Flow | 584 L/Min |
| Max Head | 5 m |
| Power | 0.75 kW / 415v |
| Rated Current | 1.6 Amps |
| Suitable For | Commercial Building Services HVAC |
| 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 inlet and outlet port sizes are fitted to this fluid pumping unit?
Suction connections measure 65 mm axially while discharge measures 50 mm radially on the Grundfos NB 50-160/139, using PN16 standard flanges.
Which mechanical shaft seal and internal components maintain internal hydraulic clearances on this unit?
Dynamic sealing on the NB 50-160/139 incorporates a BQQE mechanical shaft seal and replaceable wear rings that retain internal clearances.
Which alloys make up the pump casing and rotating hydraulic assembly?
The NB-50-160-139 features an electrocoated EN-GJL-250 cast iron volute and a precision stainless steel impeller for lasting durability.
How much volumetric water flow and vertical lift can this pump maintain?
Delivering up to 584 L/Min in volumetric flow and 5.164 m in dynamic head, the NB 50 160 139 adapts across its curve.
What media temperature limits and system pressure ratings are accommodated?
Thermal boundaries on the NB/50/160/139 support media temperatures from -25°C to 120°C alongside maximum line pressures up to 16 bar.
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