Criteria-based approach to justifying the stiffness parameters of elastic hangers in above-ground pipeline crossings

Abstract

The aim of this study is to substantiate a criterion-based approach to selecting stiffness parameters of elastic hangers in above-ground pipeline crossings based on the ratio between hanger stiffness and equivalent pipeline stiffness. The relevance of the research is determined by the need to improve reliability and design
efficiency of pipeline systems through a rational choice of support characteristics. The methodology is based on discrete modelling of the “pipeline–elastic hanger” system, where distributed parameters are replaced by equi-valent concentrated stiffnesses, enabling the use of matrix analysis methods. A dimensionless stiffness criterion is introduced as the ratio of hanger stiffness to the equivalent pipeline stiffness at the attachment point, providing a generalized parameter for describing system interaction. Numerical analysis revealed regularities in pipeline dis-placements and load distribution depending on the criterion value. Three characteristic operating regimes were identified: a “soft” hanger regime dominated by pipeline flexibility, a transitional regime of joint interaction, and a “stiff” hanger regime where hangers carry most of the load. The highest efficiency in controlling deformations is achieved within the transitional range. The proposed approach enables evaluation of hanger system efficiency, prediction of deformation behaviour, and justification of rational stiffness parameters. Its application ensures an optimal balance between flexibility and load-bearing capacity, improves operational reliability, and reduces the risk of excessive stresses and local overloads.