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Abstract

While restarting an ammonia plant after a shutdown, the pipe line supplying natural gas to the sulfur removal section preheat coil in the primary reformer convection section ruptured. High-pressure natural gas from the rupture ignited causing significant fire damage. The gas line rupture was determined to have been caused by corrosion. This paper examines the cause of the gas line failure and the corrective actions taken to prevent a reoccurrence.