Abstract
Decision strategy of inspection, repair and safety levels of buried pipelines under corrosive environment and the third party incident risk is described. Pipe damages, which are caused by potential defect, corrosion, and the third party accident, are classified into three major damage modes which include tension/compression, bending and dent with gouge. The risk assesment are made for the transmission pipeline system which is surrounded with various hazards spatially distributed along the pipeline route. The effect of risk reduction by the maintenance activities including periodic inspections and repair works are also taken into consideration, while the insurance premium approach is discussed to transfer the risk from the owner to the insurance company. Numerical calculations provide useful information on the effectiveness of the proposed four maintenance strategies.
