AM-91-22 WET H2S CORROSION AND INHIBITION

Description:

The interaction between atomic hydrogen and steels used in process piping and vessels is manifested in several ways: hydrogen blistering, sulfide stress cracking (SSC), hydrogen induced cracking (MC), and stress oriented hydrogen induced cracking (SOHIC). These forms of damage are common in alkaline sour refinery environments, such as fluidized catalytic cracking units (FCCU) and vapor recovery systems (VRS) and alkanolamine units. Research into these phenomena by refinery corrosion engineers has emphasized material selection, control measures such as post weld heat treatment, and repair techniques. Corrosion inhibitors are frequently used in alkaline sour environments; however, little published research is available on chemical inhibition of hydrogen damage under such conditions. In this paper, we present laboratory data illustrating the development of tests to screen inhibitors nnd the results of those tests.