March 2011, Vol. 238 No. 3


Overcoming Issues Associated With In-Line Inspection Of Gas Pipelines

Mechanical damage, corrosion and cracking are common threats affecting both liquid and gas pipelines. However, there are significant differences in the manifestations and frequency of these threats depending on the nature of the medium transported. Whereas stress corrosion cracking (SCC) is by no means limited to one type of pipeline, a conclusive body of evidence shows that it predominantly poses a threat to gas pipelines 1. Similarly, top of the line corrosion (TLC), i.e. droplets of condensed gas leading to colonies of pitting corrosion, is hardly found in liquid lines but constitutes a considerable risk for gas lines 2. To complicate matters further, tool behavior, notably i

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