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Cracking in Aging Austenitic Stainless Steel on Cryogenic Pipeline Application

Picture for Cracking in Aging Austenitic Stainless Steel on Cryogenic Pipeline Application
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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.

Product Number: 51319-13205-SG
Author: Pongpat Lortrakul
Publication Date: 2019
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Product Number: 51317--8968-SG
ISBN: 8968 2017 CP
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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.

 
Picture for Corrosion Assessment of Pipeline Steels in Supercritical Carbon Dioxide Stream
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51316-7223-Corrosion Assessment of Pipeline Steels in Supercritical Carbon Dioxide Stream

Product Number: 51316-7223-SG
ISBN: 7223 2016 CP
Author: Yimin Zeng
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Carbon Capture and Storage (CCS). The CO2 stream, captured from power plants contains highly corrosive impurities including H2O vapor, oxygen, and hydrogen sulfide. This paper presents our study on corrosion of pipeline steel in sc-CO2 containing H2O, H2S and/or O2 impurities in an autoclave.
Design of Cathodic Protection System for Duplex Stainless-Steel Pipeline: Protection Criteria and Hydrogen Embrittlement Management
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Design Of Cathodic Protection System For Duplex Stainless-Steel Pipeline: Protection Criteria And Hydrogen Embrittlement Management

Product Number: 51322-18124-SG
Author: Ashraf Al Aasmi, Kathy Buckingham, Ziru Zhang, Timothy Bieri
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A life cycle cost assessment led to the selection of DSS for field gas gathering network composing of more than 200 miles of pipelines. Buried portions are provided with external coating. Furthermore, due to high chloride content in the soils, the external corrosion threat was mitigated through the use of an external coating supplemented with CP. 

As there was no industrial reference covering onshore DSS pipeline CP criteria, lab testing was conducted to establish the criteria and confirm if the risk of hydrogen embrittlement is managed appropriately. This is further evaluated with field data to confirm pipelines integrity.   
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