The monograph offers technologies for numerical analysis of the stress-strain state of industrial pipelines, assessment of their strength under multifactor loading conditions. The technologies are built using modern methods of computational mechanics and are focused on practical application by fuel and energy specialists who solve production tasks to improve the safety and environmental friendliness of industrial pipeline systems. Their practical application is illustrated by the example of main gas pipelines .. The book can be useful to scientists, graduate students and engineers involved in the design and operation of pipeline systems, as well as specialists who control the reliability and environmental friendliness of the operation of complex technical systems. The material is available to senior students of technical universities .