Location

London

Event Website

http://www.csce2016.ca/

Description

Pipeline with multiple corrosion defects are often observed in the field. The strength of pipe with multiple corrosion patches depends on the corrosion patch intensity, their locations along longitudinal and circumferential directions of the pipe, in addition to the parameters influencing the strength of pipe with single corrosion defect. The existing design codes recommend the spacing between the corrosion patches when the interacting corrosion patches can be considered as a single patch for calculating the burst pressure of the defected pipe. In this paper, the strength and deformation characteristics of corroded pipe are investigated using finite element analysis. The parameters considered in the analysis are pipe geometries, number of corrosion patches, spacing between multiple corrosions, edge conditions (e.g. sharp and elliptical edges) and the locations of the corrosion patches. The spacing of the corrosion patches are varied along the pipe length and pipe circumference with both symmetrical and unsymmetrical orientations. The study reveals that the effect of the interaction of adjacent corrosion patches exists if the patches are located within a distance of 8t and 1.5√(Dt), where D is the pipe diameter and t is the pipe wall thickness. This distance is similar to the distance recommended in DNV-RP-F101 code. The distances recommended in ASME B31G and CSA Z662-15 codes appear to be un-conservative. The finite element results are compared with different burst pressure prediction models for corroded pipelines.


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Jun 1st, 12:00 AM Jun 4th, 12:00 AM

STR-953: BURST PRESSURE ASSESSMENT FOR PIPELINES WITH MULTIPLE CORROSION DEFECTS

London

Pipeline with multiple corrosion defects are often observed in the field. The strength of pipe with multiple corrosion patches depends on the corrosion patch intensity, their locations along longitudinal and circumferential directions of the pipe, in addition to the parameters influencing the strength of pipe with single corrosion defect. The existing design codes recommend the spacing between the corrosion patches when the interacting corrosion patches can be considered as a single patch for calculating the burst pressure of the defected pipe. In this paper, the strength and deformation characteristics of corroded pipe are investigated using finite element analysis. The parameters considered in the analysis are pipe geometries, number of corrosion patches, spacing between multiple corrosions, edge conditions (e.g. sharp and elliptical edges) and the locations of the corrosion patches. The spacing of the corrosion patches are varied along the pipe length and pipe circumference with both symmetrical and unsymmetrical orientations. The study reveals that the effect of the interaction of adjacent corrosion patches exists if the patches are located within a distance of 8t and 1.5√(Dt), where D is the pipe diameter and t is the pipe wall thickness. This distance is similar to the distance recommended in DNV-RP-F101 code. The distances recommended in ASME B31G and CSA Z662-15 codes appear to be un-conservative. The finite element results are compared with different burst pressure prediction models for corroded pipelines.

http://ir.lib.uwo.ca/csce2016/London/Structural/92