Applicability Evaluation and Anti-corrosion Technology of Internal Insulating Coating of an Oil and Gas Pipeline

Autoclave was used to simulate the internal corrosion conditions of an oil and gas mixed pipeline, and the environmental applicability of three commonly used coatings were evaluated through appearance observation, insulation performance test, adhesion and wear resistance tests. Corrosion morphology observation, thickness and leak test were performed to evaluate the on-site wind-squeezing anti-corrosion process. The results showed that although the three coatings passed the conventional test such as acid resistance and alkali resistance before leaving the factory, they all showed various degrees of failure or performance degradation in the simulated pipeline internal corrosion environment. The construction process also had a great influence on the protective effect of the coating. In order to avoid similar situations during service, during designing internal corrosion protection for different working conditions, it is necessary to consider the suitability of the coating in service environment and strictly control the on-site construction process.