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SKU: 93209291
Grundfos NB 50-125/112 Cast Iron 0.37 kW End Suction Centrifugal Pump with Closed Impeller
Australia-Wide
(08) 9240 2992
Official Grundfos
Peace of Mind
Product Overview
Cooling tower circuit lines and heat rejection stations integrate the Grundfos NB 50-125/112 centrifugal pump. Powered by a 0.37 kW electric drive, piping connects via an axial DN 65 suction port and a radial DN 50 discharge interface.
Pumping displacement generates 460 L/Min volumetric flow and overcomes a 2.659 m maximum head. A cataphoretically coated EN-GJL-250 cast iron casing houses the precision stainless steel impeller and BQQE mechanical shaft seal. Total net product weight measures 35 kg.
An incoming 415 V three-phase feed drives the motor at 0.99 Amps rated draw for 0.37 kW power delivery. Permissible media temperatures range between -25°C to 120°C under system pressures up to 16 bar. Flanged line ports measure DN 65 for suction and DN 50 for discharge.
Ingress sealing complies with IP55 standards, complemented by Class F motor insulation. The motor requires external overload protection in the electrical control panel. A back-pull-out mechanical design enables service personnel to extract the impeller and drive assembly without dismantling pipe flanges.
Features
- 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.
- 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.
SPECIFICATIONS
| Max Flow | 460 L/Min |
| Max Head | 2 m |
| Power | 0.37 kW / 415v |
| Rated Current | 0.99 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.
Which metals and seal materials provide lasting reliability in this pump?
Electrocoated iron forms the casing of the Grundfos NB 50-125/112, utilizing EN-GJL-250 material and a durable stainless steel impeller.
What service advantages does the back-pull-out structural layout provide?
Plant maintenance on the NB 50-125/112 leaves facility pipework connected, utilizing a back-pull-out layout for fast mechanical servicing.
Which inlet and outlet port sizes connect to mechanical plant pipework?
Standard PN16 flanged connections on the NB-50-125-112 include an axial 65 mm suction intake and a radial 50 mm discharge port.
What fluid temperature ratings and working line limits apply to this pump?
The NB 50 125 112 safely accommodates pumped fluid temperatures from -25°C to 120°C under working pressure limits up to 16 bar.
How much dynamic lift and fluid throughput does this unit deliver?
The NB/50/125/112 provides up to 460 L/Min in fluid flow and 2.659 m in dynamic head, depending on system pressure demands.
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