"> Grundfos Grundfos NB 50-250
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Engines
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Grundfos

Grundfos NB 50-250

Grundfos Grundfos NB 50-250 is a centrifugal pump in the supplied category 'Pumps / Centrifugal Pump'. It is normally installed in the machinery space or service area adjacent to the piping system it serves. It is intended to move shipboard liquids through the connected piping system. Compared with neighbouring entries in the same series, the supplied data identifies this variant by a supplied power rating of 7.5 kW, the stated medium freshwater. In service it interfaces with suction and discharge piping, valves and strainers, the driver, seal arrangement, instrumentation and local or remote controls. Model-specific limits, settings, dimensions and acceptance criteria that are not stated in the supplied data should be taken from the manufacturer documentation.

7.5 kW
Power
freshwater
Medium

Components & Design

Component data being added…

Technical Data

pump type end_suction_centrifugal
flow m3h 50
head m 50
power kw 7.5
medium freshwater

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Common failures & inspection points

●Air ingress or loss of prime reduces suction performance, noticed as low discharge pressure, fluctuating flow or cavitation noise
●Blocked strainers or restricted suction causes cavitation and reduced capacity, noticed as vibration and poor flow
●Mechanical-seal or gland wear causes leakage around the shaft and may lead to bearing contamination
●Bearing or alignment problems cause abnormal noise, vibration and rising bearing temperature
●Impeller, rotor or internal wear reduces hydraulic performance, noticed as lower pressure or flow at normal operating conditions

Service & Maintenance

Inspect leakage, coupling or drive condition, mounting, vibration, bearing condition, suction strainers and valve positions. Verify normal pressure and flow trends, motor current and local/remote control where fitted. Check seals and running clearances in accordance with the pump design; refer to manufacturer documentation for exact allowable clearances and performance figures.

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Replacement Parts

Carry the correct shaft-seal or gland parts, gaskets and O-rings, bearings where justified by criticality, coupling elements and model-specific wear parts such as impellers, rotors, stators or internal bushings as applicable.
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Equipment Model #67693 · ✓ still in production