The power industry, from coal-fired thermal power to industrial power plants, relies on hundreds of pumps, fans, and compressors working continuously. A seal failure in critical equipment can force a generator to reduce load or stop unplanned, causing significant damage. This article presents the main mechanical seal applications in power plants and the points to note when selecting.
Boiler feedwater has a high temperature, near the boiling point, so it easily vaporizes at the seal face if cooling is insufficient. Seals for this service often use heat-resistant configurations such as metal bellows seals, combined with auxiliary cooling schemes like Plan 23 to keep the seal face temperature stable. Water quality and startup procedures directly affect seal life.
Limestone slurry in the FGD system contains abrasive solid particles and has corrosive properties. Seals for slurry pumps require hard seal faces like silicon carbide, anti-clogging design, and flushing to protect the seal face, such as Plan 32 or external flushing. Split seals are also used to reduce maintenance time.
Segmented carbon ring seals are commonly used for steam turbines and high-speed compressors due to their good heat and speed resistance, while minimizing axial gas or vapor leakage.
Gas-fired power plants use fuel gas compressors, and many places choose dry gas seals to reduce leakage and eliminate the oil sealing system. The gas supply system for the seal needs to be clean, dry, and at the correct pressure.
Power plants often schedule maintenance during major overhauls. Preparing spare cartridge seals, making a list of spare parts, and training technicians help shorten the shutdown time.
SNS-VN supports consulting on selecting mechanical seals, carbon seals, dry gas seals, and auxiliary systems for thermal power, gas power, and industrial power plants. Please contact us for a quote.