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[MW:3870] root cause anaylsis

By Materials & Welding


dear all
i want to discuss one case study with you i am working in a chemical plant and one of our plant is Nitric acid production in it on of our equipment is stationary ( BLEACHING TOWER) whose function is to absorb oxides of nitrogen from 50-60 nitric acid at average 70-90 centigrade by spraying water from top and moving up the nitric acid from bottom. the main problem is that the material of this tower is ss 321 and in shut down we observe severe depletion in the thickness of shell especially near the HAZ of welds so would you please tell me most probable cause of this failure and its most possible remedy

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with Regards


SAQIB JALAL
Inspection Engineer
PakArab Fertilizer Limited
Khanewal Road , Multan
office number +92-61-9061 EXT 3110
mobile number +92-321-4043556



--
with Regards


SAQIB JALAL
Inspection Engineer
PakArab Fertilizer Limited
Khanewal Road , Multan
office number +92-61-9061 EXT 3110
mobile number +92-321-4043556

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