Remaining Life of a Pipeline

Sensitivity Analysis
Contribution of the wall thicknes "T"
Contribution of the radial corrosion growth rate"Rd"
2
C .
2 S1 1
α 1
σpf 2 α 1
0.764
2
C .
2 S2 2
= α 2
σpf 2 α = 0.479 2
Contribution of the longitudinal corrosion
growth rate"Rl"
Contribution of the corrosion depth at t = to "Do"
2
C .
2 S3 3
α 3
σpf 2 α 3
3.639 10 3
2
C .
2 S4 4
= α 4
σpf 2 α = 0.359 4
Contribution of the pipe diameter "D"
2
C .
2 S5 5
α 5
σpf 2 α = 0.223 5
Contribution of the yield strength of the
pipeline material "Sy"
2
C .
2 S6 6
α 6
σpf 2 α = 3.808 10 5
6
Contribution of the corrosion length at t = to "Lo"
i 1, 2..
7
2
C .
2 S7 7
α 7
σpf 2 α = 0.091 7
7
i = 1
α i
2
= 1
% 100 . 2
α i i
60
% contribution on the var. of Pf
wall thickness
% contribution var. of ith R.V
40
Step #4 System Analysis
20
radial corrosion
growth rate
defect depth
0
0 1 2 3 4 5 6 7 8
16