TY  - JOUR
PY  - 2021//
TI  - A random field model of external metal-loss corrosion on buried pipelines
JO  - Structural safety
A1  - Bao, J.
A1  - Zhou, W.
SP  - e102095
EP  - e102095
VL  - 91
IS  - 
N2  - This paper proposes a random field model to characterize the corrosion depth on the external surface of buried steel oil and gas pipelines. The model addresses the intermingling of corroded and corrosion-free areas on the pipe surface, similar to the spatial intermittency of rainfall accumulation within a geographic area, by using a latent homogeneous Gaussian random field and a spatial position-dependent threshold associated with the latent Gaussian field. High-resolution corrosion measurement data obtained from corroded pipe segments removed from in-service pipelines are used to estimate parameters of the proposed model, including the probability of corrosion at a given point, marginal distribution of the nonzero corrosion depth and correlation structure of the latent Gaussian field. The results indicate that the nonzero corrosion depth follows a shifted lognormal distribution. The isotropic -exponential correlation function is adequate to characterize the correlation structure of the latent Gaussian field with the correlation length varying from 17 to 50 mm and from 0.69 to 0.82. A comparison of simulated and measured corrosion fields suggests that the proposed model is able to capture the characteristics of naturally-occurring corrosion field on the pipe surface. The proposed model provides a useful tool for developing fitness-for-service assessment methodologies for corroded pipelines. copyright  2021 Elsevier<p />  <p>Language: en</p>
LA  - en
SN  - 0167-4730
UR  - http://dx.doi.org/10.1016/j.strusafe.2021.102095
ID  - ref1
ER  -