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Chongqing branch recently introduced three Zhejiang Jiali 125GY150 pipeline pumps into its oil tanker linoleum pipeline refueling system. After over two years of operation, the vertical control structure of the high-coaxial pipeline centrifugal pump has proven to be highly efficient. This system simplifies pipeline connections, ensures smooth fluid intake and discharge, minimizes shaft seal leakage, operates with low noise, and delivers high efficiency with low energy consumption.
With the rapid economic growth in Chongqing and the increasing demand for aviation fuel supply, pipeline filling has become the primary method for aircraft refueling. To ensure continuous and reliable oil supply, maintaining the normal operation and quick repair of pipeline pumps has become a top priority for oil depot equipment management.
**Key Usage Points for Pipeline Pumps:**
1. **Testing:** Check if all connections are secure. Manually rotate the rotor to ensure smooth movement and listen for any unusual noises or vibrations. Confirm that there is no foreign object inside the pump or bent shaft. Ensure the seal is properly installed and the seal cavity is filled halfway with No. 20 lubricating oil. Keep the pump unit clean and perform a no-load test.
2. **Manual Start:** When starting for the first time, slightly open the outlet valve, start the motor, and monitor pressure rise. Ensure the pump runs smoothly before fully opening the outlet valve.
3. **Operation Check:** During normal operation (with frequency conversion), regularly check and record readings from ammeters, voltmeters, vacuum gauges, pressure gauges, and flow meters. Monitor vibration, noise, and temperature. The shaft seal should show minimal fuel leakage.
4. **Normal Shutdown:** Close the discharge valve, allow the pump to run at light load, then turn off the motor.
5. **Emergency Stop Situations:**
- Abnormal motor current or strange sounds from the system.
- Unusual pressure readings, excessive vibration, or significant performance drop.
- Motor odor, fuel leakage at the shaft seal, or bearing temperatures exceeding 75°C.
**Quick Maintenance Tips for Pipeline Pumps:**
1. Every 500 hours of operation, loosen the screw plug on the seal seat and use a syringe to remove residual oil. Refill the chamber with qualified No. 20 oil up to half its volume. Tighten the plug to prevent leaks.
2. If motor noise increases or bearing temperature rises abnormally, check the motor bearings. Replace grease if it becomes discolored or dirty.
3. If oil leakage is detected at the seal seat, loosen the plug and run the pump. If aviation fuel smell is present, the mechanical seal may have failed. Immediately stop the pump and replace the seal.
4. **Replacing a Failed Mechanical Seal:**
- Prepare a clean work area and necessary tools. Avoid placing parts randomly to prevent damage.
- Before disassembly, ensure the motor is powered off. Remove the filler screw and extract lubricant using a straw.
- Disassemble the coupling by removing the hexagonal screws and gently pulling one half of the coupling off. Use a wrench to remove the pump shaft bolt and let the impeller sink slowly.
- Remove the other coupling and take out the pump shaft.
- Loosen the sealing seat compression nut and carefully remove the seat without damaging the rubber seal. Clean thoroughly.
- Loosen the bearing seat slightly, lift it along the pump axis, and remove the bearings. Clean them with jet fuel and apply a thin layer of No. 20 oil before reinstallation.
- Disassemble the mechanical seal by lifting the spring and removing the pump shaft.
- Reassemble the mechanical seal: Apply a thin layer of No. 20 oil to the static and dynamic rings. Lubricate the guide bearing and position the stationary ring. Slide the moving ring onto the pump shaft and ensure it moves freely.
- Install the sealing seat, ensuring the rubber seal is in place. Press the seat into the pump cover and tighten the nut.
- Reinstall the coupling by securing the retaining ring on the motor shaft, attaching one half of the coupling, and installing the stopper. Tighten the bolts, lifting the shaft slightly to apply pre-stress to the mechanical seal.
- Reattach the other half of the coupling and ensure even gap between the upper and lower halves.
- Perform a test run to confirm proper installation and smooth operation of the pump.
Real-world experience has shown that following these procedures ensures the pipeline pump remains a reliable core component of the apron refueling system. With frequency control, the pump can operate smoothly, save energy, and provide long-lasting, high-quality fuel transportation over long distances.