A dual mechanical seal for refinery pumps is widely used in hydrocarbon processing environments where leakage control, operational safety, and regulatory compliance are critical. Refinery pumps operate under high pressure, elevated temperatures, and hazardous fluid conditions. In such environments, even minor seal leakage can result in safety risks, environmental penalties, and costly downtime. This article explains why dual mechanical seals are required in refinery pump systems, how they function under API 682 standards, how to select the correct configuration, and what common failure mechanisms must be avoided.
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