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In mechanical engineering, an end-face mechanical seal (often shortened to mechanical seal) is a type of seal used in rotating equipment, such as pumps, mixers, blowers, and compressors. When a pump operates, the liquid could leak out of the pump between the rotating shaft and the stationary pump casing. Since the shaft rotates, preventing this ...
API Standard 682, titled "Pumps - Shaft Sealing Systems for Centrifugal and Rotary Pumps," is the American Petroleum Institute standard for end-face mechanical seals. [1] The purpose of API 682 is to assist in the selection and operation of end face mechanical seals in centrifugal pumps. It is based on the combined knowledge and experience of ...
Silicon carbide (SiC), also known as carborundum (/ ˌ k ɑːr b ə ˈ r ʌ n d əm /), is a hard chemical compound containing silicon and carbon. A wide bandgap semiconductor , it occurs in nature as the extremely rare mineral moissanite , but has been mass-produced as a powder and crystal since 1893 for use as an abrasive .
Hexoloy is a registered trademark for a pressureless sintered form of alpha silicon carbide. Hexoloy SA is made by sintering silicon carbide powder. This process bonds the powder together to create a self-bonded product which is extremely hard and lightweight. It has a high resistance to corrosion, erosion, high temperature and thermal shock.
A simple labyrinth seal A labyrinth seal on a steam turbine shaft. A labyrinth seal is a type of mechanical seal that provides a tortuous path to help prevent leakage. An example of such a seal is sometimes found within an axle's bearing to help prevent the leakage of the oil lubricating the bearing.
Neoprene (CR) - Good balance between chemical and mechanical resistance. Nitrile (NBR) - Excellent resistance to oils and fats. EPDM - Best for hot fluid, for acid and alkaline fluids. Silicone (VMQ) - Best for very high temperature. The end face mechanical seal can be made of: Ceramic; Stainless steel; Graphite; Tungsten carbide; Silicon carbide