In integrity management programs, crack-like indications am sometimes detected on pipelines by means of hydrostatic testing, direct examination, or in-line inspection. Many of these are non-injurious mill defects while some might undergo time dependent growth. Mechanism for growth include fatigue, corrosion fatigue, and stress corrosion cracking. The cyclic pressure fluctuations typically present on operating pipelines affect all three mechanisms of crack growth. This paper describes several methods for assessing the remaining life of pipeline segments containing growing defects.

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