Wet H2S Cracking
Wet H2S cracking can occur at carbon steel equipment exposed to aqueous or “wet H2S” service. Wet H2S is defined as service conditions of at least 50 ppm of H2S dissolved in a liquid water phase. Streams with higher H2S or with cyanides are considered more severe. In addition to specific repair and inspection requirements for this service, the construction of pressure vessels for this service requires specifications formulated to minimize the problems associated with this service including post weld heat treatment and wet fluorescent magnetic particle testing. In addition, t is possible to use HIC resistant steels for these services. Specifications EG-4750 and EG-4749 provide additional requirements for sour service. For more information, refer to the Wet H2S Notebook available from CRTC.
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