Which material is commonly used for the dynamic seal in mechanical seals on centrifugal pumps?

The use of carbon as a material for the dynamic seal in mechanical seals on centrifugal pumps is based on several advantageous properties. Carbon is favored because it provides excellent wear resistance and can withstand the operating conditions commonly found in pumping applications, such as high pressures and variable temperatures. Specifically, carbon has the ability to maintain a good balance of hardness and stability, which is critical for effective sealing in the dynamic state, thereby preventing leakage between the rotating and stationary parts of the pump.

Furthermore, carbon’s low coefficient of friction contributes to reduced wear over time, enhancing the longevity of the mechanical seal. It also performs well in the presence of various lubricants and fluid media, making it versatile for many types of fluids that centrifugal pumps might handle.

Other materials listed, while used in some sealing applications, do not provide the same combination of durability, resistance to wear, and performance as carbon when employed specifically for dynamic seals in mechanical seals for centrifugal pumps.