XBD-GJ Deep Well Long-Shaft Fire Pump — Deep Water Extraction & Fire Protection Specifications
The XBD-GJ deep well long-shaft fire pump is a vertical deep well centrifugal pump designed for fire protection water supply systems that draw from pools, wells, or other deep water sources. Its multi-stage impeller arrangement delivers the flow and pressure required by fire hydrant and automatic sprinkler networks, making it a reliable choice for facilities where surface water supply is unavailable or insufficient.
System Architecture
The pump group consists of three major sections: the working section submerged in the well, the riser pipe section extending upward, and the above-ground section housing the drive motor and pump base. The motor, mounted above ground at the wellhead, transmits power through a drive shaft concentric with the riser pipe down to the submerged multi-stage impellers. This long-shaft configuration eliminates the need for submersible motors while maintaining reliable power transmission across significant depth.
Core Performance Parameters
| Parameter | Value |
| Flow rate Q | 5 – 110 L/s |
| Head H | 32 – 200 m |
| Motor power N | 3 – 200 kW |
| Rated speed n | 2900 or 2850 r/min |
| Design standard | GB 6245 fire pump performance requirements |
Model Designation
| Code | Meaning |
| XBD | Electric Motor-Driven Fire Pump |
| 8.0 | Rated Pressure Code (times 0.1 MPa) |
| 20 | Rated Flow Code (L/s) |
| G | Fire Protection System Water Supply Type |
| W | Fire Protection System Pressure Maintenance Type |
| J | Well Pump |
| CD | Company Abbreviation (Chaodun) |
Structural Components
Working Section
The submerged working section comprises the impeller assembly and strainer. Impellers are enclosed-type design for higher efficiency, connected in series via bolted shell joints. Guide shells and impellers can be fitted with wear rings to extend service life. A cone-shaped sleeve and shell bearings support the impeller shaft within this section. The strainer assembly prevents debris from entering the pump stages.
Riser Pipe Section
The riser section consists of riser pipes, drive shafts, couplings, and support brackets. Riser pipes are flange-connected for modular length adjustment to match well depth. Drive shafts are manufactured from 2Cr13 stainless steel or equivalent corrosion-resistant material to withstand prolonged immersion. Couplings between shaft sections ensure continuous torque transmission from motor to impeller.
Above-Ground Section
The above-ground assembly includes the pump base, electric motor, motor support bracket, and coupling. This section bears the weight of the entire drive train and aligns the motor shaft with the long vertical drive shaft. Proper alignment during installation is critical to minimize vibration and bearing wear.
Operating Conditions
- Media: generally non-corrosive clean water.
- Solid content in water: not more than 0.01% by weight.
- pH range: 6.5 to 8.5.
- Hydrogen sulfide content: not more than 1.5 mg/L.
- Water temperature: not exceeding 40 degrees C.
Installation Guidelines
- Piping weight support — Pipe weight must not rest on the pump body. External pipe supports are required to prevent deformation and damage to pump connections.
- Foundation bolts — Anchor bolts must be tightened to specification and checked periodically to prevent loosening, which can cause vibration and performance degradation during startup.
- Valve and gauge installation — Install regulating valves on both inlet and outlet piping. Mount pressure gauges near pump connections. For high-head installations, fit a check valve upstream of the outlet gate valve to protect against water hammer during power loss.
Start-Up and Shutdown Procedure
Pre-Start Preparation
- Rotate the motor shaft by hand. The impeller should turn freely without binding or grinding.
- Jog the motor to confirm rotation direction — it must be counter-clockwise when viewed from above.
Start-Up and Operation
- Close the outlet pipe valve.
- Energize the motor. Once the pump reaches normal speed, gradually open the discharge valve and adjust to the desired operating point.
- Monitor instrument readings, motor temperature, and bearing temperature rise. Address any abnormal readings immediately.
Shutdown
- Gradually close the discharge valve, then cut power.
- If ambient temperature falls below 0 degrees C, drain the pump body completely to prevent freeze damage.
Maintenance Requirements
- Do not operate the pump in cavitation conditions for extended periods.
- Do not allow the motor to run above rated current at high flow conditions.
- Monitor motor current during operation to keep the pump within its design operating range.
- Assign dedicated personnel to monitor the pump during operation.
- After extended operation, increased noise or vibration indicates the need for inspection. Replace worn parts and bearings as needed. Standard overhaul interval is one year.
- When not in use — Start the pump at least once per month for a minimum of 15 seconds each time to prevent seizure and maintain readiness.
Application Scenarios
Industrial and Mining Enterprise Fire Systems
Factories, mines, and processing plants located away from municipal fire water infrastructure rely on the XBD-GJ to draw from on-site wells or reservoirs. The multi-stage design delivers the head needed to overcome both depth and the friction losses in long fire protection piping networks.
High-Rise Building Fire Protection
Tall residential and commercial buildings require high-pressure fire water supply to reach upper floors. The XBD-GJ series covers heads up to 200 meters, providing adequate pressure for hydrant and sprinkler systems in high-rise construction where conventional surface pumps cannot generate sufficient head.
Engineering Construction Projects
Temporary or permanent fire protection systems on construction sites, infrastructure projects, and remote installations benefit from the deep well capability. The modular riser pipe design allows the pump length to be adjusted to match actual water source depth at each site.
Why Choose Chaodun Pumps
Chaodun Pumps designs and manufactures the XBD-GJ deep well long-shaft fire pump in compliance with GB 6245 fire pump standards. Each unit undergoes factory performance testing to verify rated flow and head before shipment. The modular construction — working section, riser pipe section, and above-ground section — simplifies installation, maintenance, and depth adjustment for different well conditions.
For dimensional drawings, foundation templates, and selection assistance based on your specific flow, head, and well depth requirements, contact our engineering team.