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Many unexpected cracks occur in aging of more than eighteen years old austenitic stainless steel on cryogenic pipeline application. The operation needed to be disrupted before undertaking repairs or maintenance; resulting in delay transmission. 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 pipelines. Fatigue crack propagation through metal is driven by thermal stress during start/stop service operation period proven by microstructure analysis and NDT inspection result. An assessment suggests that the pipeline need to be replaced. Corrosion controls on further pipeline are established.
Planned operation of natural gas liquefaction units offshore has raised new safety concerns. Technip has run a physical test program to investigate performances of insulation materials as well as developing a test method.
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