Effect of pressure and defects on the pipe flattening factor

W Edjeou (1) , G Pluvinage (1, 2) , Julien Capelle (2) , Z Azari (1, 2)

1 ENIM - Ecole Nationale d'Ingénieurs de Metz
2 LEM3 - Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux

Starting from an actual case of an oil pipe exhibiting significant ovalization, maximum admissible flattened factor fad proposed by codes (3%) is discussed. The weak point of this rule is its geometric character. It is shown that the fad decreases with pressure and with geometrical defects. It is not very sensitive to the bent shape of the pipe, or the location between ovalization and orientation supports. A simple elastic model based on a safety factor of two (2) is proposed

Mots clés: Pipe; Ovalization; Flattened factor; Working pressure

Domaines: Mécanique des matériaux [physics.class-ph]

W Edjeou, G Pluvinage, Julien Capelle, Z Azari. Effect of pressure and defects on the pipe flattening factor. Engineering Failure Analysis, 2018, 94, pp.469-479. ⟨10.1016/j.engfailanal.2018.08.017⟩. ⟨hal-02972719⟩