Which alloy should be used in oil refinery processes for better performance

 While Monel 400 offers superior resistance to SCC in aerated acid, it is not adequate to prevent damage. Monel K500 and 400 grades are exposed to corrosive conditions in vapor phase of hydrofluoric acid in the presence of oxygen. Studies emphasize the need to eliminate air in the vapor phase above the acid. As HF alkylation units are carefully maintained to eliminate oxygen, the minor difference between these two alloys is not a determining factor. It is suggested that gauges desired for direct HF service ensure that they are free of residual water. If air cannot be removed from the process, a diaphragm seal should be used.

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