EVAPORATOR/HEAT EXCHANGER STEAM JACKET CONDENSATE DRAIN LINE FATIGUE FAILURE

In 2022, an industrial 25 foot tall evaporator/heat exchanger with a steam jacket heating feature experienced a fracture at an upper steam jacket condensate drain.  The resulting crack penetrated the steam jacket leading to a failure.

The unit was removed from service and subsequently investigated as to the root cause of the failure.

Once metallurgical aspects had been eliminated as a contributing cause of the failure mechanism, GES Tech Group, Inc., was subcontracted to evaluate design details related to differential thermal expansion and to verify the root cause of the failure.