August 2005

Heat Transfer

Repair critical-service exchangers with innovative methods

In this case history, unconventional maintenance techniques stopped chronic leaking for an olefin's heat-exchanger circuit

Rajkumar, R., Reliance Industries Ltd.

A common problem for heat exchangers is tube to tube-sheet leaks. For large petrochemical facilities, such leaks occurring and re-occurring are critical concerns and are a high priority for process and maintenance engineers. At times, conventional remedial actions can result in reduced processing throughput and unscheduled downtime. Both adversely impact plant profitability. In this case, we will investigate an innovative method to repair a critical-service propylene heat exchanger cost-effectively. THE PROBLEM Propylene gas loss was noticed from the cracking plant circuit. This loss was traced to heat exchangers within the circuit. Two sets of condensers, known as propylene-t

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