Common questions among industrial plant professionals are: “Under what conditions will a mechanical seal leak?”and “What is a normal degree of leakage when the equipment is operating?” This article will provide insights into this sometimes- confusing area of plant maintenance and operation with additional focus on applications involving high-temperature heat transfer fluids. WHAT IS A MECHANICAL SEAL? A mechanical seal consists of two members: a stationary seat and a rotating head. The head is statically sealed to and rotates with a pump shaft. The seat is statically sealed to a non-moving cover. The head has a spring-loaded, highly polished, very flat face that is also frequently pressure-loaded against that same seat face. Pri

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