Pump And Valve Industry

Pumps are one of the commonly used devices in the mechanical industry and are widely applied in sectors such as chemical, petroleum, mining, shipping, food, medical, and papermaking. Their application in the power sector is also extensive, including deep well pumps, boiler feed pumps, circulating water pumps, condensation pumps, ash pumps, as well as oil and coal-water pumps. Due to the high-speed operation of centrifugal pump components, such as impellers, cavitation, and wear are severe, to significant economic losses for power plants during failures and maintenance.

To extend the lifespan of screw pumps, it is essential to enhance the wear resistance of the rotor and stator. So, how can we improve their wear resistance? First, a basic inspection and assessment of the rotor and stator should be conducted to identify the areas and extent that require repair. Timely repairs using wear-resistant materials can enhance their wear capability.

Using thermal spraying techniques, such as plasma or flame spraying, we can apply agglomerated ceramic powders made of chromium oxide, silicon oxide, and titanium oxide to repair the worn rotor and stator. After the coating cools, specialized tools and techniques are utilized for machining, grinding, and polishing the repaired rotor and stator, followed by strict testing and inspection to ensure their performance and quality meet the required standards.

The coatings made from agglomerated powders of chromium oxide, silicon oxide, and titanium oxide exhibit properties such as resistance to abrasive wear, hard surface wear, corrosive wear, and cavitation wear. Repairing screw pump rotors with these coatings can significantly improve their wear resistance and extend their service life.