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Nov . 07, 2025 13:50 Back to list

300QJB Deep Well Submersible Pump - High Head & Efficiency

If you work around groundwater projects long enough, certain models become shorthand for “get it done.” The 300QJB Deep Well Submersible Pump is one of those. Built in Hebei (No. 6 Xingyuan Road, West District, Lincheng Economic Development Zone), it’s the kind of heavy-duty unit that contractors quietly recommend to each other after the meeting ends. Undertake OEM processing? Yes. Non‑standard builds? Also yes. I’ve seen a few iterations out in the field and, to be honest, the customization flexibility is what stands out.

Industry trends first: water utilities and mining operators are pushing for higher efficiency at higher heads, with tougher metallurgy due to sand and chemistry. Meanwhile, procurement requires documented standards. This unit implements GB/T2816-2014 for well submersible pumps and GB/T2818-2014 for well submersible asynchronous motors—comforting, because auditors will ask.

300QJB Deep Well Submersible Pump - High Head & Efficiency

Typical specifications (real-world values may vary)

Model 300QJB
Bore size (nominal) ≈300 mm
Flow range ≈120–480 m³/h
Head ≈80–420 m
Motor power ≈75–400 kW (50/60 Hz)
Voltage 380/660 V, 3 kV/6 kV options
Materials 304/316 SS; Duplex 2205 optional
Seal Dual mechanical (SiC/TC) + lip seal
Protection/Insulation IP68 / Class F
Max sand ≤0.05%
Service life ≈20,000–30,000 h (conditions dependent)

Note: acceptance per ISO 9906 grade 2B or 1B (on request).

Where it’s used

  • Municipal water intake and rural irrigation (deep aquifers).
  • Mine dewatering—particularly where low NPSH and high head coincide.
  • Industrial raw water, light desal feed, geothermal reinjection.

Advantages that keep coming up in customer notes: steady efficiency (we saw ≈84% pump efficiency at BEP in one factory test), low vibration (≤2.8 mm/s), and insulation resistance >100 MΩ at 500 V Megger. A few buyers told me it “just runs” through monsoon seasons—anecdotal, sure, but consistent.

300QJB Deep Well Submersible Pump - High Head & Efficiency

Manufacturing and test flow (how it’s built)

  • Materials: SS 304/316 or Duplex cast/precision-machined runners; hardened wear rings.
  • Motor: water-filled asynchronous design; vacuum impregnation; balanced rotors (ISO 1940 G6.3 or better).
  • Assembly: concentricity checks; double mechanical seal faces (SiC/TC); food-grade lubrication where specified.
  • Testing: hydrostatic pressure test; performance test per ISO 9906; routine motor tests per IEC 60034; insulation and withstanding tests.
  • Burn-in: ≈2 h continuous run; final QA to GB/T2816-2014 and GB/T2818-2014.

Vendor snapshot (quick comparison)

Vendor Customization Lead time Standards/Certs After‑sales
Wellpump ACT (Hebei) High (non‑standard builds, OEM) ≈20–35 days GB/T 2816 & 2818, ISO 9001 On‑site guidance, spare kits
Import Brand X Medium ≈6–10 weeks ISO 9906 / IEC 60034 Distributor-only
Generic OEM Trader Low–Medium Variable Claimed only Limited

Field notes and mini case studies

  • North China irrigation well: two 300QJB Deep Well Submersible Pump units, 160 m head, 240 m³/h each. Measured wire-to-water efficiency ≈72% (site data). Downtime in first season: zero.
  • Underground metal mine: one 300QJB Deep Well Submersible Pump, 320 m head, Duplex metallurgy. Sand content near limit; seals survived 14 months before planned swap—better than previous brand by ~4 months, per maintenance logs.

Customization is the kicker: voltage, metallurgy, cable spec, and even thrust bearing upgrades. Many customers say the WhatsApp support is quick (try 17855846335). And yes, CE paperwork is available for export jobs when needed.

Certifications & compliance: Built to GB/T2816-2014 and GB/T2818-2014; hydraulic testing per ISO 9906; motor tests per IEC 60034; quality system typically ISO 9001:2015. Documentation packs and FAT protocols are available on request.

  1. GB/T 2816-2014 Well Submersible Pump, State Administration for Market Regulation – openstd.samr.gov.cn
  2. GB/T 2818-2014 Well Submersible Asynchronous Motor – openstd.samr.gov.cn
  3. ISO 9906:2012 Rotodynamic pumps — Hydraulic performance acceptance tests – iso.org
  4. IEC 60034-1 Rotating electrical machines — Ratings and performance – iec.ch


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