April 2007

Storage/Reliability

Defect analysis of an ammonia storage tank

Here's how the causes of unusual problems with this tank were determined

Pullarcot, S. K., International Inspections Centre W.L.L.

Ammonia storage is one of the most essential facilities a fertilizer manufacturer should have for uninterrupted plant operation. Two types of storage are normally adopted by the industry: one at high pressures and atmospheric temperatures and another at slightly above atmospheric pressures and at temperatures as low as –33°C. If the holding capacity required is high, the obvious solution is the atmospheric pressure ammonia storage at low temperature. The tank considered belongs to this category. Since it holds large quantities of liquid anhydrous ammonia, failure of this tank is considered catastrophic not only to the plant and machinery, but also to the entire town because of th

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