August 2021

Special Focus: Valves, Pumps and Turbomachinery

Dual-mechanical seal arrangement for hot pump service

Selecting mechanical seals for hot services in an oil refinery or petrochemical plant is always a challenging task—and it is a task that needs careful attention, since the wrong seal selection can have a significant impact on pump reliability and availability.

Zardynezhad, S., TurboTech Consulting Corp.

Selecting mechanical seals for hot services in an oil refinery or petrochemical plant is always a challenging task—and it is a task that needs careful attention, since the wrong seal selection can have a significant impact on pump reliability and availability. Hot pumping services include liquid temperatures above 175°C (347°F); however, this article includes lessons learned based on liquid temperatures of more than 200°C (392°F). This work is based on the author’s experience in dual mechanical seal arrangement selection for large-scale hydrocarbon processing plants. Mechanical seal categories, types and arrangements The seal configurations covered by the API 682 standard1 are classified i

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