There is no single "best" deep well submersible pump that suits every project — the right choice depends on well diameter, required depth, water quality, energy goals, and whether the installation calls for fixed-speed or variable-frequency operation. The products manufactured by Hebei Aochite Water Supply and Drainage Equipment Technology Co., Ltd. span several distinct series, each documented to GB/T2816-2014 and GB/T2818-2014 standards, so buyers can make a fact-based selection.

The questions below cover the integration requirements, spare parts, and maintenance practices confirmed in the published product materials for these deep well pump series. For a full overview of the available range, visit the Deep Well Submersible Pump product page.

Q1: What installation orientation is required for all series, and why does it matter?

Every series — Semi-Stainless Steel Split, 125QJB, 135QJB, 150QJB, 200QJB, and 200QJ — requires strictly vertical installation. The water-filled wet motor structure depends on gravity and the surrounding water column for bearing lubrication and cooling. Off-axis or tilted mounting disrupts this water circulation, accelerates bearing wear, and can cause motor burnout.

Q2: What well-diameter and depth constraints must be checked before integrating a QJB-series pump?

The 125QJB, 135QJB, 150QJB, and 200QJB pumps are rated for a maximum immersion depth of 70 metres, while the Semi-Stainless Steel Split Series can reach up to 300 metres. The 135QJB requires a minimum well diameter of 135 mm. Regardless of series, the bottom of the pump must be positioned at least 3 metres from the well bottom to prevent mud and sediment ingestion.

Q3: What water-quality parameters must the source water meet for integration to be safe?

All confirmed series share the following water-quality boundaries:

• pH value: 6.5 – 8.5
• Solid impurities: ≤ 0.01% (mass ratio)
• Chloride ion content: ≤ 400 mg/L
• Hydrogen sulfide: ≤ 1.5 mg/L
• Water temperature: ≤ 20 °C

Exceeding any of these limits is outside the operating envelope and may affect the application's expected performance.

Q4: How does the 200QJ Series integrate with a submersible motor compared with the QJB series?

The 200QJ Series is specifically for direct integration with a separate submersible motor through a vertical, compact coupled structure. Its flow range (5 – 500 m³/h), lift range (4 – 800 m) and power range (3 – 315 kW) make it suitable for municipal, agricultural, mining and flood-drainage projects where the QJB variants would be undersized. The QJB series (125 – 200 mm bore) is instead purpose-built around an integrated water-filled wet motor for residential and light-industrial depths up to 70 metres.

Q5: What power supply is required, and does it support variable-frequency drive (VFD) integration?

All confirmed series operate on three-phase AC 380 V (±5%), 50 Hz (±1%). The QJB models (125QJB, 135QJB, 150QJB, 200QJB) incorporate a frequency-conversion winding designed to run stably from 1 Hz to 50 Hz, making them compatible with VFD control panels for energy saving and flow adjustment. The Semi-Stainless Steel Split Series and 200QJ Series are not described as having frequency-conversion windings in the confirmed materials.

Q6: What cable integration steps are specified to ensure waterproof integrity?

Confirmed documentation across the QJB series specifies professional waterproof jointing and high-pressure insulation tape wrapping for all cable connections before deployment. The 200QJ materials additionally note multi-layer high-pressure insulation taping for deep-well cable joints. Insulation resistance must reach a minimum of 150 MΩ as verified by a 500 V shaking-table test prior to installation.

Q7: Which components are identified as wearing parts that need periodic replacement?

The confirmed maintenance materials for the QJB series identify impellers and sealing rings as the primary wearing parts subject to annual inspection and replacement. The Semi-Stainless Steel Split Series highlights the rotor wear-resistant alloy sleeves and alloy thrust discs as key durability components, and confirms that the ceramic anti-sand structure is designed to reduce impeller wear from abrasive particles.

Q8: What makes the QJB impeller design more wear-resistant than a standard pump?

The Semi-Stainless Steel Split Series uses high-strength anti-sand PC composite polymer impellers combined with a ceramic anti-sand structure and a three-dimensional hydraulic floating-impeller design. The QJB frequency-conversion series employs dual oil seals and a dedicated sand-prevention ring to keep well debris from reaching the motor chamber. Confirmed comparison data describes standard fixed-speed pumps as using basic sealing without these added layers.

Q9: Are non-standard motors and pump components available as spare parts for OEM customers?

Yes. The confirmed product excerpts state that Hebei Aochite Water Supply and Drainage Equipment Technology Co., Ltd. undertakes OEM processing to design and manufacture non-standard motors and pumps according to user requirements for all listed series. This covers both the submersible motor and the pump hydraulic end, subject to direct agreement with the factory.

Q10: What is the recommended maintenance interval, and what does it cover?

All confirmed series reference annual disassembly and inspection as the standard maintenance cycle. Annual checks cover:

• Wearing parts (impellers, sealing rings)
• Conical sleeve integrity — specialised tools are required for removal to prevent shaft bending
• Insulation resistance measurement (minimum 0.5 MΩ at the start of the initial 4-hour operational test)
• Cable joint waterproofing

Q11: How should the motor's insulation resistance be monitored during operation?

Documented guidance calls for real-time observation of voltage, current, and insulation resistance to prevent motor burnout. Before the first run, insulation resistance must be ≥ 0.5 MΩ. The 200QJB and 125QJB materials additionally require a pre-deployment 500 V shaking-table test with results exceeding 150 MΩ.

Q12: What protection systems are built in to reduce unplanned maintenance?

Confirmed protection features vary by series but collectively include:

• Short-circuit protection
• Overload protection
• Phase-loss (phase failure) protection
• Undervoltage protection
• Idling (dry-run) protection

The Semi-Stainless Steel Split Series and 200QJ Series materials explicitly list these as autonomous protection systems that trip the motor before damage occurs.

Q13: How should a deep well submersible pump be stored during winter to prevent damage?

Confirmed storage guidance for the QJB series requires draining all water from the motor cavity before storage to prevent freezing damage. Pumps should be stored in environments below 40 °C and treated with anti-corrosion measures. The Semi-Stainless Steel Split Series materials separately describe dedicated drainage protocols for motor cavities as part of winter-storage care.

Q14: What thermal checks apply during the initial commissioning phase?

The Semi-Stainless Steel Split Series documentation specifies systematic thermal insulation resistance checks with a minimum of 0.5 MΩ during the initial 4-hour operational test. The QJB series includes a pressure-regulating diaphragm (or pressure regulating film) that manages internal expansion caused by motor temperature rises — reducing the thermal stress that would otherwise require corrective maintenance.

All series adhere to GB/T2816-2014 and GB/T2818-2014 standards. Specific flow, head, and power ratings within each series should be confirmed directly with Hebei Aochite Water Supply and Drainage Equipment Technology Co., Ltd.