DETERMINATION OF SAFETY AND SECURITY FACTOR OF A GAS PIPE EXHIBITING A CORROSION DEFECT BY USING SINTAP PROCEDURE COUPLING WITH PROBABILISTIC METHOD (PART II)

Abstract

In this paper, the goal is to compute the remaining safety and security factors after apparition of corrosion crater in a gas pipe using probabilistic approaches. For these purposes, we propose to use the failure assessment diagram SINTAP level I coupled with Monte Carlo, FORM or SORM methods.Application is made for a pipe of diameter 219,1mm and thickness 6.1mm submitted to internal pressure of70 bars. Corrosion crater is assumed to be a crack like defect of depth equal to half thickness and crack aspect ratio a/c = 0.2. The safety factor obtained by applying SINTAP procedure is found equal to fs = 4.5.The security factor obtained from a probability of failure of 10-6 is found equal to fS = 2.5.

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