This present study includes analysis of absolute pipeline sizes (length, width, well thickness) relevance for pipelines calculation of strength and durability, and analysis of effect the pipeline sizes on resistance to failure. There was considered statistical and energetically aspects of the size-scale effect and obtained results of calculation. Evidence from these calculation suggests that strength properties (tensile and yield strength) decreases by 10 – 30 % with increasing in absolute sizes of present pipe sections.
The obtained results of calculations are confirmed by results of experiments performed at different times, and correlate with the statistics of failures on main oil and product pipelines of Transneft PJSC. Comparison of results of definition of mechanical properties according to the results of calculations based on the scale factor and evaluation of the effect of scale factor in accordance with current regulatory documentation (construction rules and regulations SNiP 2.05.06-85*) indicates a high degree of correlation of the results of the calculations and expert estimates, which were obtained on the basis of years of experience of operating pipelines (suggested by the leading experts in the field of reliability of building structures, the dependence of fracture resistance in a dangerous section of the volume of metal in the development of SNiP 2.05.06-85* has been reflected in an implicit form using the reliability coefficient by appointment).
According to the results of the calculations determined the coefficient values of the strength reduction for main sizes of pipes of main oil and product pipelines, and proposed approaches to the estimation of scale factor for pipeline structures, as well as its use in the revised calculations of durability, reliability and survivability of the piping at the stage of designing and exploitation.
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