A numerical model to calculate drawing forces and determine the contact forces of interaction of the inner pipeline with the pipe of a larger diameter has been developed. The module takes into account the complicated geometric profile of the outside pipe, the possibility of loss of contact by support rings, the mass of the inner pipeline and the action of buoyancy force, longitudinal and transversal (due to sag) force from the pulling rope, the compliance of the pipe-ring system, etc. The results of calculation were used in determining the interval of the rings disposition and the choice of their dimensions (height). Described is the effect of a tensed string when the increased coefficient of friction entails a nonlinear growing increase of drawing force.

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