Mechanical seals for pumps (mechanical seal) are the most common shaft sealing solution in industrial centrifugal pumps. The seal helps prevent liquid leakage into the environment, reduces product loss, limits shaft wear, and ensures plant safety. Compared to gland packing, mechanical seals have much lower leakage, consume less power, and require less maintenance.
The seal consists of a rotating sealing face and a stationary sealing face attached to the pump body. The two faces are pressed against each other by a spring or a bellows, with a very thin liquid film in between that lubricates and seals. The flatness of the seal face and the quality of the liquid film directly determine the lifespan of the seal.
Seal faces are typically made of silicon carbide, tungsten carbide, carbon graphite, or ceramic. The auxiliary sealing gasket can be FKM, EPDM, PTFE, or FFKM. The choice of material depends on temperature, corrosion, viscosity, and solid content in the medium.
For pumps in the oil and gas and petrochemical industries, seals and auxiliary systems are often designed according to API 682 (ISO 21049). This standard regulates the classification, installation configurations, and piping plans for drainage and cooling, aiming to increase the reliability and lifespan of the seal.
To choose the correct seal, you need to know: pump type and shaft size, rotation speed, pressure and temperature in the seal chamber, composition and viscosity of the medium, solid content, and emission requirements. Providing complete information helps shorten the selection time and avoid incorrect choices.
SNS-VN supports consulting, supply, and maintenance of mechanical seals for various pump types in the oil and gas, petrochemical, chemical, and power industries. Please contact us for consultation and quotation.