SEALING SENSE

Are the symptoms, causes, and correctiveactions for failure of mechanical seals by thermal attack? symptom of thermal attack is the appear-ance of fine-to-large radial cracks that emanate fromthe center of the metal or ceramic ring. Character-ized asheat checking,these cracks act as cuttingedges on the carbon-graphite and other seal facematerials, and the consequent scraping action rapid-ly wears out the causes of heat checking include: (1)insufficient lubrication; (2) vaporization at the sealfaces; (3) inadequate cooling; and (4) excessive pres-sures and velocities. Any one or a combination ofthese factors can result in higher friction and heat atthe seal faces. The excessive thermal stresses thatdevelop will result in fine Actions include: Checking operating conditions to ensure theyare within the prescribed limits for the seal.

Q.What are the symptoms, causes, and corrective actions for failure of mechanical seals by thermal attack? A. One symptom of thermal attack is the appear-

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  Action, Leasing, Senses, Sealing sense

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