In Abu Qir fertilizers company, urea plant located in Alexandria, Egypt. The outlet gases line from the top of the reactor was exposed to catastrophic failure occurred at the lower part of the pipeline connecting top of the reactor to scrubber., gases outlet pipeline of the reactor was deformed and twisted along its length and removed away from its location. Also the rupture disc of the scrubber was torn up at different zones around gases outlet line Corrosive carbamate gases were flowing in this line under pressure of 140 bar and 183 °C. the line was made from 316 L UG with thickness about 14.2 mm. it was noticed that huge fractured opening the line beside many cracks were appeared in the inner surface. To investigate and know what happened, samples from fractured zone were sent to Central Metallurgical Research and Development Institute in Egypt. It was concluded that the main reason behind this disaster was Stress corrosion cracking.
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