Method of Strength Analysis of Composite Electrical Insulating Insertion for Pipeline Systems

A method of strength analysis of the composite electrical insulating insertion for the electrical partitioning of pipeline systems for oil-gas industry is developed. Main elements of the insertion are as follows: two metallic nipples with welded circular ribs, an electrical insulating non-metallic ring and a composite load-bearing shell. Design relations are obtained allowing stresses and strains in the nipples, shell mono-layers and circular ribs to be determined. To predict loads under which plastic deformations in metallic elements and microcracks in a polymer binding agent of the composite material, there are used correspondingly a condition of the plasticity beginning of Huber-Meases and the maximum stress criterion. A calculation example is given.