This paper summarizes investigations on the effect of mechanical and geometrical properties on collapse behavior of UOE pipes and describes the technologically practical properties for high collapse resistance. At first, standard procedures for characterization of the geometrical and mechanical pipe parameters are described. Then the influence of relevant pipe parameters on the collapse behavior was analyzed in a parameter study making use of a 3D Finite Element (FE) model of the collapse test. The investigated parameters were: pipe ovality, wall thickness and compressive stress-strain relationship of the pipe material. The parameter study included global and local effects of the parameters along within the pipe cross-section. Finally, three full-scale collapse tests were intended to investigate the collapse behavior of UOE pipes before coating (heat treatment) in comparison to numerical investigation. The measured pipe geometries confirmed low ovality and eccentricity of UOE pipes.

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