Inspection and Study of the lifespan of buried structures using the Weibull approach

The steels of pipelines for the transport of hydrocarbons are stressed by damage phenomena, particularly by corrosion by soils. After detection of these failures by non-destructive testing such as ultrasound or by magnetic flux, the remaining time must be evaluated by a probabilistic approach. This work consists in evaluating the remaining service life of corroded pipes by Weibull approach over a distance of 70km from the Gaz pipeline Hassi R’Mle - Arzew. Inspection results showed peak corrosion depths with a rate of 10-30% of the thickness and two areas damaged by corrosion with a rate exceeding more than 70%. The different reliability parameters namely reliability function, failure function, failure rate, rated life from MATLAB computer code were also determined and discussed.