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Coating of the internal surface with a ceramic layer is useful for preventing the formation of deposits and extending the lifetime of the tubes, preventing the economic and operational issues derived from the carbon deposition on the surface of stainless steel tubes in the chemical industry. The thermal degradation of dimethyl ether (DME) at 700 ºC has been used as reaction test to compare the carbon deposition on standard and coated tubes. The results indicate an outstanding decrease in the amount of deposited carbon on the coated tubes, as well as the possibility of operating at longer times since the carbon deposits are only formed at the very beginning of the tests. The reversibility of the formation and combustion of the carbon deposits is proved for the coated tube, so that reproducible results have been attained in different cycles, which is not possible with a conventional uncoated stainless-steel tube.
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Risk-based inspection is a business process and improvement tool to enhance asset performance as well as asset life. This paper intends to discuss risk-based coating inspection parameters to enhance coating/lining life and prevent and or mitigate the corrosion threat to assets. This paper further discusses each key aspect of protective coating/lining inspection parameters and its intended purpose.
Due to the regulations of toxic biocidal products in marine environments, the development of nontoxic antifouling (AF) coatings has become required. The development of nontoxic antifouling formulations implies the use of ingredients (such as: polymers, additives and pigments) that are devoid of toxicity towards marine environments. In this regard, erodible coatings, based on biodegradable polymer, are used to respond to this problem. Recently, polyurethane (PU) has been adopted into antifouling coating due to its ability to migrate the certain functional groups which resist the attachment of fouling. Biodegradation of PU can accelerate the erodible properties which ultimately improve the antifouling properties. In this study, a series of biodegradable PU coatings was formulated by tuning biodegradable polyol. The antifouling performance was evaluated after certain intervals.