The aggressive environment of oil refineries contributes to increased corrosion of reinforced concrete supports of trunk pipelines. This is primarily due to the increased concentration of acid gases. The article presents results of the analysis of the gas-air environment of an oil refinery and its impact on primary support measures. It was established that when using typical reinforced concrete supports made from B15 W2 concrete, the protective layer with a thickness of 15 mm becomes neutralized 3-6 years after the operation. To ensure continuous 25-year operation, it is necessary to increase thickness of the protective layer to 35 mm. To increase the durability of the structure, it is proposed to replace steel reinforcement with “metal-fiberglass” or hybrid fiberglass one.