{"product_id":"grundfos-nb-50-125-135-cast-iron-5-5-kw-end-suction-centrifugal-pump-with-closed-impeller","title":"Grundfos NB 50-125\/135 Cast Iron 5.5 kW End Suction Centrifugal Pump with Closed Impeller","description":"\u003cp\u003eCommercial fluid circulation duties in hydronic heating plants and industrial process loops are handled by the NB 50-125\/135 end-suction centrifugal pump. Equipped with a 5.5 kW motor drive, the unit features standardized DN 65 axial inlet and DN 50 radial outlet flanged pipe connections.\u003c\/p\u003e\u003cp\u003eLiquid circulation capacity reaches a rated flow volume of 1264 L\/Min while generating 19.13 m maximum head limit. The casing body is cast in EN-GJL-250 iron with electrocoated protective finish. Fluid movement is driven by a stainless steel impeller with BQQE mechanical shaft seal. Net product weight measures 103 kg.\u003c\/p\u003e\u003cp\u003eA 5.5 kW drive motor powers the NB 50-125\/135 unit from a 415 V three-phase electrical source, drawing 10.5 Amps nominal current. Working fluid limits handle liquid temperatures from -25°C to 120°C under line pressure ratings up to 16 bar. Standard DN 65 inlet and DN 50 outlet flanged connections support mounting.\u003c\/p\u003e\u003cp\u003eProtective features on the NB 50-125\/135 pump include an IP55 motor enclosure, Class F winding insulation, and internal PTC thermistor monitoring. The back-pull-out design allows complete drive and impeller extraction without disturbing connected suction or discharge pipework flanges in plant rooms.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIntegrally cast suction and discharge ports with dedicated vent and drain ports provide direct connection points without additional fittings.\u003c\/li\u003e\n\u003cli\u003eNo baseplate or grouting required to maintain correct shaft alignment and vibration levels within Hydraulic Institute standards.\u003c\/li\u003e\n\u003cli\u003eCataphoretic electrocoating on cast iron internal surfaces provides barrier protection against oxidative corrosion in hydronic circulation loops.\u003c\/li\u003e\n\u003cli\u003eClose-coupled configuration eliminates coupling alignment procedures and reduces overall installation footprint compared to long-coupled alternatives.\u003c\/li\u003e\n\u003cli\u003eBall bearing support arrangement accommodates both radial and axial thrust loads generated during continuous duty operation at rated speed.\u003c\/li\u003e\n\u003cli\u003ePN16 flanged connection ratings on sizes up to and including DN 150 provide elevated working pressure capability beyond standard EN733 10 bar ratings.\u003c\/li\u003e\n\u003cli\u003eO-ring seal between pump housing and cover eliminates leakage risk at the volute-to-cover joint under sustained operating pressures.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eIMPORTANT:\u003c\/strong\u003eBulk freight charges apply. Please contact us for a freight quote before ordering.\u003c\/p\u003e","brand":"Grundfos","offers":[{"title":"Default Title","offer_id":51148678037751,"sku":"93209294","price":5096.69,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0927\/0116\/3767\/files\/grundfos-nb-50-125-135-cast-iron-5-5-kw-end-suction-centrifugal-pump-with-closed-impeller.png?v=1789124270","url":"https:\/\/foundationpumps.com.au\/products\/grundfos-nb-50-125-135-cast-iron-5-5-kw-end-suction-centrifugal-pump-with-closed-impeller","provider":"Foundation Pumps","version":"1.0","type":"link"}