Vol.10, No3, 2010, pp.179-186
UDC  620.193.4 : 621.643-034.14   620.193.4 : 669.14-462

DEFECT ASSESSMENT ON PIPE USED FOR TRANSPORT OF MIXTURE OF HYDROGEN AND NATURAL GAS

J. Capelle1, J. Gilgert1, I. Dmytrakh2, G. Pluvinage1

1) LaBPS, Ecole Nationale d’Ingénieurs de Metz (ENIM), Ile du Saulcy, Metz, France

2) Karpenko Physico-Mechanical Institute of National Academy of Sciences of Ukraine, Lviv, Ukraine

Abstract

The present article indicates the change of mechanical properties of X52 gas pipe steel in presence of hydrogen and its consequence on defect assessment, particularly on notch-like defects. The purpose is to determine if the transport of a mixture of natural gas and hydrogen in the existing European natural gas pipe network can be done with an acceptable low failure risk (i.e. failure probability less than 10–6). To evaluate the risk, a deterministic defect assessment method has been established, based on Failure Assessment Diagram (FAD), and more precisely on here proposed Modified Notch Failure Assessment Diagram (MNFAD). The MNFAD is coupled with the SINTAP failure curve and enables determining the safety factor associated with defect geometry, loading conditions and material resistance. The paper is performed in the scope of project NATURALHY, part 3 “Durability of pipeline material”.

Keywords: defect assessment, pipeline, gas transport, mixture of nitrogen and natural gas, probability of failure

full article (525 kB)