Abstract
Many unexpected cracks occur in aging 18 years old austenitic stainless steel on cryogenic pipeline application. Operations need to be stopped for treatment and repair which results in delay transmission against customer. Systemic root cause analysis reveals that random cracks initiated on external surface when operating condition reaches room temperature. Degradation of cold thermal insulation provides accessibility for air-borne chloride to the pipe. Fatigue crack propagation through metal is driven by thermal stress during start/stop service operation period proven by microstructure analysis and NDT inspection result. Assessment reveals pipeline need to be replaced. Corrosion control for new pipeline are established.
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2019
Association for Materials Protection and Performance (AMPP)
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