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Oct . 25, 2025 13:25 Back to list

250QJB Deep Well Submersible Pump High Head & Energy Saving

Field Notes: What the 250QJB Deep Well Submersible Pump Is Getting Right

If you’ve been watching water infrastructure and dewatering projects lately, you’ve noticed a shift: tougher wells, sandier aquifers, and longer duty cycles. That’s exactly where the 250QJB Deep Well Submersible Pump keeps popping up in bid specs. I’ve toured the Lincheng plant in Hebei—quietly efficient—and, to be honest, the most interesting part was how much customization they’ll actually do without turning the unit into a unicorn.

250QJB Deep Well Submersible Pump High Head & Energy Saving

Industry pulse

Three trends keep coming up in tenders: higher heads for deeper boreholes, better efficiency grades (energy tariffs bite), and stricter testing documentation. This model leans into ISO 9906 performance testing and GB/T compliance, which—surprisingly—some imported brands still skirt in documentation.

At-a-glance technicals

Below is a typical configuration set. Real-world use may vary with groundwater chemistry and well design (screen size, drop pipe friction, etc.).

Model 250QJB (Ø well ≥ 250 mm)
Flow rate ≈ 80–320 m³/h
Total head ≈ 80–420 m
Motor power 45–185 kW (asynchronous, water-filled, rewindable)
Voltage 380/660 V, 50 Hz (60 Hz optional)
Materials Casing: SS304/SS316L; Impeller: SS, or Ni–Al bronze; Shaft: 420/431 SS
Protection/Insulation IP68 / Class F; thrust bearing with water lubrication
Water limits T ≤ 35°C; sand ≤ 0.01% (by mass); pH 6.5–8.5
Standards GB/T 2816-2014; GB/T 2818-2014; ISO 9906 Grade 2B
250QJB Deep Well Submersible Pump High Head & Energy Saving

Process and testing (how it’s built)

Materials are batch-traced SS304/316L with impellers CNC-machined and dynamically balanced (ISO 1940 G6.3). Stators are epoxy impregnated; rotors are precision ground. Every unit gets a 1.5× rated pressure hydrostatic test, routine electrical per IEC 60034, and a performance curve witnessed to ISO 9906. Typical efficiency at duty: 72–80% depending on staging. Expected service life: ≈ 5–10 years; MTBF data from recent runs sits around 20,000–30,000 hours, assuming clean power and proper filtration.

Where it’s used

  • Municipal and rural water supply (deep borefields)
  • Irrigation pivots and canals; aquifer recharge
  • Mine dewatering (coal, metals), construction dewatering
  • Industrial process water and emergency backup wells

Customization and support

OEM processing is standard—non-standard shafts, abrasion sleeves, 316L wet end, longer cables, and VFD-friendly motor windings are common requests. Many customers say the drawings turnaround is quick, which, I guess, is why these units show up in tight-schedule retrofits. Origin: No. 6 Xingyuan Road, West District, Lincheng Economic Development Zone, Hebei Province. WhatsApp: 17855846335.

250QJB Deep Well Submersible Pump High Head & Energy Saving

Why this model works

The 250QJB Deep Well Submersible Pump hits a sweet spot: stout thrust bearings, honest efficiency curves, and parts you can actually source. Plus, the documentation is tidy—CE/ISO 9001 factory QA and GB/T declarations included.

Vendor snapshot (rough guide)

Vendor Customization Lead time Standards Warranty
Wellpump ACT (Hebei) High (materials, staging, cables) ≈ 15–30 days GB/T, ISO 9906 18 months (typical)
Import A Medium ≈ 6–10 weeks ISO 9906 only 12 months
Regional B Low–Medium ≈ 20–45 days Basic factory QA 12–18 months

Mini case studies

  • Hebei municipal wellfield: 6 sets of 250QJB Deep Well Submersible Pump, 220 m head. Measured wire-to-water efficiency improved ≈ 7% vs previous set; payback in 14 months.
  • Inner Mongolia mine dewatering: sand 0.008%. Ni–Al bronze impellers; 10 months continuous duty, no thrust bearing swap yet.
  • Gulf irrigation retrofit: 60 Hz build, 316L wetted parts; chloride 600 ppm; vibration stayed under 3.5 mm/s RMS at duty.

What to specify (quick checklist)

Well diameter and depth, duty point (Q/H), water analysis, cable length and spec, discharge thread/flange, material grade, sand tolerance, VFD use, and documentation level (witness test to ISO 9906 if you need it). The 250QJB Deep Well Submersible Pump is most compelling when paired with a clean power feed and measured startup ramp.

Authoritative citations

  1. GB/T 2816-2014 Well Submersible Pump. State Administration for Market Regulation. https://openstd.samr.gov.cn
  2. GB/T 2818-2014 Well Submersible Asynchronous Motor. State Administration for Market Regulation. https://openstd.samr.gov.cn
  3. ISO 9906:2012 Rotodynamic pumps — Hydraulic performance acceptance tests. International Organization for Standardization. https://www.iso.org/standard/52450.html
  4. IEC 60034 Rotating electrical machines. International Electrotechnical Commission. https://webstore.iec.ch


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