Troubleshooting Mechanical Seals – Coking – Part 7

from Chesterton
Posted 2/23/2004

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SEAL FACE – COKING              SEAL FACE – CRYSTALLIZED

SYMPTOMS: Coking or crystallized product CAUSES: Excessive temperatures (both) Dirty or contaminated fluid (coking) Operating outside of the temperature envelope of the fluid (both) Small clearances in the seal chamber Pump cooling jacket not efficient Fluid evaporation between the seal faces (crystallization)

FAILURE MODES: Inadequate environmental controls Product harden, set-up or coked Exceeded limits (speed, temperature, pressure)

SOLUTIONS: Proper use of environmental controls Operate within seal limits Understand the temperature envelope of the fluid being sealed

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