Investigation into the detection and classification of defect colonies using ACFM Technology

Carroll, L. Blair (1998) Investigation into the detection and classification of defect colonies using ACFM Technology. Masters thesis, Memorial University of Newfoundland.

[English] PDF (Migrated (PDF/A Conversion) from original format: (application/pdf)) - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (20MB) [English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. (Original Version)

Abstract

A research project was undertaken to provide insight into the use of Alternating Current Field Measurement (ACFM) technology for the detection and classification of transgranular stress corrosion cracking (TGSCC) plaguing Canada's oil and natural gas transmission pipelines. Work was conducted using a series of machined defects and natural TGSCC samples. The results suggest that ACFM warrants further investigation in a larger scale project. Guidelines for future endeavors are provided. -- Of the 63 machined defects, used in 21 colony configurations, visual inspection identified all of the defects and an automated computer algorithm missed only one. The data set was not large enough to develop a sizing algorithm but provided valuable insight into defect signal interactions. -- Present ACFM technology is capable of detecting natural SCC colonies, but more work is required before individual crack classification can be achieved when the cracks appear in clusters.

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