250QJH140-150/6-90kW Stainless Steel Deep Well Pump
140 m³/h flow, 150 m head and three-phase 415V 50Hz power for engineered water systems
The 250QJH140-150/6-90kW is a six-stage stainless steel deep well submersible pump rated for a flow of 140 m³/h and a head of 150 m. It is matched with a 90 kW motor operating on a three-phase 415V 50Hz power supply. The pump is intended for high-capacity, high-head duties such as deep-well abstraction, industrial water supply, agricultural irrigation, mine drainage, tank filling and long-distance water transfer.
The pump and submersible motor form an integrated underwater unit that requires no surface priming. This arrangement reduces surface space requirements and operating noise. Stainless steel construction can improve corrosion resistance in compatible water conditions. The final grade and configuration must be selected according to the water analysis, borehole dimensions, installation depth and system resistance.
Why the Actual Duty Must Be Recalculated
A rated head of 150 m is not the same as the total well depth, and the pump will not necessarily deliver 140 m³/h under every site condition. Total dynamic head normally includes the vertical lift from the dynamic water level, required outlet pressure, pipe-friction losses and losses through valves and fittings. The calculated system curve must be checked against the pump curve to verify actual flow, energy demand and operating stability.
Frequently Asked Questions
What does 250QJH140-150/6-90kW mean?
Under common well-pump naming conventions, 140 indicates the rated flow of 140 m³/h, 150 indicates the rated head of 150 m, "/6" indicates six stages, and 90 kW is the matched power. The exact meaning of "250" can vary by manufacturer, so pump diameter and minimum borehole size must be checked against the approved dimensional drawing.
Can the pump be installed directly in a 250 mm borehole?
This cannot be confirmed from the model alone. Clearance is required for the cable, joints, riser pipe and installation, and borehole straightness must also be considered. Provide the measured internal diameter and obtain written dimensional confirmation before purchase.
Is the stainless steel grade 304 or 316?
The available information confirms stainless steel but does not specify the grade. Grade 304 may be evaluated for general clean water, while higher chloride levels or stronger corrosivity may require 316, 316L or another solution. Final selection must be based on the water analysis and supplier confirmation.
Can this pump handle seawater or highly corrosive liquids?
Stainless steel construction alone does not confirm suitability for seawater or aggressive liquids. These duties require a specific review of metal grades, seals, cable, motor construction, crevice corrosion and galvanic corrosion, followed by written supplier approval.
Can the 90 kW motor use direct-on-line starting?
The decision depends on grid capacity, permitted voltage drop, local codes and motor requirements. A soft starter, reduced-voltage starter or compatible variable-frequency drive may be evaluated, but an electrical engineer must confirm the starting method, protection settings and output configuration.
What information is required for a quotation?
Please provide the target flow, total head, borehole diameter, well depth, static and dynamic water levels, water analysis, pump setting depth, pipeline data and three-phase 415V 50Hz power conditions. Complete information enables a more accurate selection and quotation.
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