This type of water pump is widely used in the domestic market and is highly favored by users for its simple structure, stable operation, reliable quality, high efficiency, and ease of installation and commissioning. Its pump shaft features a special design, created by extending a standard motor shaft; this eliminates the need for a coupling, ensures high concentricity, facilitates installation, and plays an irreplaceable role in the pump's drive system. As a component subject to long-term operation, it inevitably encounters malfunctions, with excessive shaft power being a common issue leading to damage. Today, pump our engineering team will analyze the causes of and solutions for excessive shaft power in single-stage pipeline pumps.
Causes of excessive shaft power in single-stage pipeline pumps:
1. Misalignment between the pump shaft and the prime mover shaft.
2. Actual pump speed exceeds the design speed (as specified on the nameplate).
3. Gland packing is tightened excessively.
4. Bearing damage; contaminated oil; excessive, dried-out, or insufficient grease/oil.
5. Excessive flow rate.
6. High viscosity or specific gravity of the pumped medium.
7. Severe friction between the impeller and the seal ring.
Solutions for excessive shaft power in single-stage pipeline pumps:
1. Inspect, clean, or service the bearings; maintain the grease and lubricate according to standards.
2. Adjust the tightness of the packing gland so that leakage remains within standard limits.
3. Service the seal ring or adjust the clearance between the impeller spigot and the seal ring.
4. Reduce the rotational speed to meet the pump's original design specifications.
5. Reduce the specific gravity or viscosity of the pumped medium to meet design requirements.
6. Measure and adjust the concentricity of the centrifugal pump unit to meet standard requirements.
7. Partially close the discharge valve to control the flow rate within the optimal operating range.
We hope you have gained some valuable insights from the information above regarding the causes and solutions for excessive shaft power in single-stage pipeline pumps.