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Erosion corrosion of the carbon steel components of ammonia refrigeration section of a fertilizer plant.

Author(s) : KAIN V., PRASAD G. E., GADIYAR H. S.

Type of article: Article

Summary

A number of carbon steel components in the ammonia refrigeration section of a fertilizer plant showed severe corrosion problems after a few years of commissioning of the plant. The carbon steel components are in contact with ammoniacal solutions (17-27% ammonia) under pressures up to 1.5 MPa and potassium dichromate (0.15%) is used as an inhibitor. Earlier studies had indicated leakage of reducing gases, CO and hydrogen into the system resulting in reduction of dichromate to trivalent chromium and precipitation of chromate into the ammoniacal stream. The cause of the failure has been attributed to erosion corrosion by the precipitated chromate and/or other suspended impurities in the high velocity ammoniacal streams, and steps to be taken to minimize the corrosion damage have been suggested.

Details

  • Original title: Erosion corrosion of the carbon steel components of ammonia refrigeration section of a fertilizer plant.
  • Record ID : 1993-1397
  • Languages: English
  • Source: Indian J. Technol. - vol. 30 - n. 7
  • Publication date: 1992/07
  • Document available for consultation in the library of the IIR headquarters only.

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