The article demonstrates the examples of the material factors as well as typical research methods for determining the contribution of these material factors to the reliability and durability of oil and oil products pipeline transport facilities. Among the most common material factors are the following: dependence of the actual material properties on the duration of operation and operating conditions (increase in strength characteristics; drop in ductility and viscosity characteristics); change in local properties of facilities in the areas of defects; failure to perform the routine modes of thermomechanical processing of pipe products during their production; the presence of anisotropy of the properties of the material of structures in various directions; increased contamination of metal with non-metallic inclusions and their groups and accumulations (low metallurgical quality); presence of structural sections with actual characteristics different from the rest part of the structure; presence of significant residual stresses; low cyclic properties; deviation of chemical composition parameters from the requirements of regulatory documentation for products. The actual characteristics of the material used in the manufacture of the structure are also an important factor determining the reliability of oil and oil products pipeline transport structures (pipes, tanks, connecting parts of pipelines, mechanical and engineering equipment). Both the low values of these characteristics and the available deviations from the regulatory or design parameters can shorten the life of the structure or result in its sudden failure. Actual characteristics of metal in the structures are used as basic values (input data) for calculation of strength and durability of operation of structures with defects. Each of the above-mentioned material factors shall, to one degree or another, be comprehensively studied and taken into account with a corresponding weight factor in the parameters of reliability of pipeline transport facilities operation.
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