{"product_id":"grundfos-nb-50-250-254-cast-iron-30-kw-end-suction-centrifugal-pump-with-closed-impeller","title":"Grundfos NB 50-250\/254 Cast Iron 30 kW End Suction Centrifugal Pump with Closed Impeller","description":"\u003cp\u003eConstructed for fixed foundation mounting in mechanical rooms, the NB 50-250\/254 single-stage end-suction pump connects via DN 65 suction and DN 50 discharge ports. A 30 kW electric motor provides mechanical power for continuous water circulation across building service headers.\u003c\/p\u003e\u003cp\u003eFluid output parameters show a rated throughput of 1525 L\/Min and a maximum head limit of 75.37 m. Electrocoating treatment on the cast iron casing limits rust in hydronic loops. The internal rotor holds a stainless steel impeller with bronze wear rings. Unit physical weight is 275 kg.\u003c\/p\u003e\u003cp\u003eOperating on a 415 V three-phase power supply, the NB 50-250\/254 electric motor yields 30 kW output power with a current draw of 56 Amps. Media temperature capabilities span from -25°C to 120°C under continuous line pressures up to 16 bar. Flanged ports feature DN 65 suction and DN 50 discharge sizing.\u003c\/p\u003e\u003cp\u003eWinding insulation on the NB 50-250\/254 motor complies with Class F standards within an IP55 dust and spray resistant motor housing equipped with PTC thermistors. Service procedures benefit from back-pull-out construction, permitting internal rotor disassembly without disconnecting main system pipework headers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHousing, impeller and wear ring use dissimilar material pairings to prevent galling and ensure no sticking elements during extended standby periods.\u003c\/li\u003e\n\u003cli\u003eHigh-efficiency motor selection is configured to match the specific power supply characteristics, pumping environment and liquid properties of each installation.\u003c\/li\u003e\n\u003cli\u003eBack pull-out design allows complete rotating assembly removal including motor, coupling and impeller without disturbing pump housing or connected pipework.\u003c\/li\u003e\n\u003cli\u003eEN733 and ISO2858 dimensional compliance ensures interchangeability with other standard end-suction pumps across commercial and industrial installations.\u003c\/li\u003e\n\u003cli\u003eATEX Zone 1, 2, 21 or 22 certification available for operation in potentially explosive atmospheres (except E-model variants).\u003c\/li\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\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":51148679938295,"sku":"93209321","price":12741.25,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0927\/0116\/3767\/files\/grundfos-nb-50-250-254-cast-iron-30-kw-end-suction-centrifugal-pump-with-closed-impeller.png?v=1789124295","url":"https:\/\/foundationpumps.com.au\/products\/grundfos-nb-50-250-254-cast-iron-30-kw-end-suction-centrifugal-pump-with-closed-impeller","provider":"Foundation Pumps","version":"1.0","type":"link"}