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Severe corrosion and cracking problems in Amine units and associated plants have been documented extensively. Mitigating these issues has had a significant economic impact in the oil and gas refining industries where this equipment is used to capture acid gases, such as CO2 and H2S. Currently, expensive austenitic stainless steels and other corrosion resistant alloys are being utilised to control these corrosion issues with varying degrees of success.In this paper, the use of advanced cold applied liquid coatings, as an alternative solution to expensive alloys, are examined. In particular, the performance of a specific coating is considered (under a rigorous testing regime) in environments containing the amines MDEA and DGA with combinations of sour gases. The permeation properties of the coating were also examined by conducting a six month cold wall test using demineralised water at 150oC. It is found that this coating offers excellent resistance even when the testing environment respectively contains 38.8% H2S at a temperature and pressure of 150oC and 1000psi. Finally, some case studies are discussed which provide verification to the experimental results obtained.
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This paper is presented as a practical guide to identifying the causes of corrosion in different sections of gas sweetening trains and ways to control and minimize corrosion in amine plants.