Many oil and gas facilities are located in the permafrost zone, where the urgent task is to reduce capital expenditures (CAPEX). One of the optimization directions in the construction of above-ground pipelines is to increase the span between the supports. The possibility of increasing the span of the flyover using the example of a field pipeline is examined. The calculations were performed using ANSYS software. The parameters of the grid model that provide a stable solution are determined, and a comparative analysis of deformations and stresses of the pipeline from the effects of static loads obtained in the START-PROF software is carried out. Due to the prediction of the magnitude and frequency of dynamic loads with a large error, it is impossible to accurately determine the service life of the pipeline; an estimate was made of the number of calculated load cycles of the pipeline before destruction according to the fatigue curves for steel 09G2C strength class K48. For the pipeline in question, there is a range of span values at which pipeline movements are ensured within the sites of construction supports, the stresses that occur don’t exceed the limit values, but there is a significant decrease in the service life. The results of the discounted CAPEX assessment showed that despite the reduction in the service life of the pipeline when the flyover span is higher than the value obtained under dynamic strength conditions, the discounted CAPEX at a rate of 15 % will be lower ensuring higher economic performance.
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