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00012 Aggressive CO2 Corrosion and Fatigue Behavior of Pipeline Girth Welds

Product Number: 51300-00012-SG
ISBN: 00012 2000 CP
Author: K. E. Szklarz
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Aggressive CO2 corrosion of weld HAZ was shown to affect the fatigue properties of pipeline girth welds in a strain-based design which allowed tensile stresses on cool down. Two types of accelerated growth mechanisms were present based on crack tip dissolution and what appeared to be an unknown local embrittlement. Testing showed chemical inhibition could control the first propagation mechanism. Keywords: pipeline, wet natural gas, corrosion fatigue, CO2 corrosion, girth weld, fatigue crack propagation
Aggressive CO2 corrosion of weld HAZ was shown to affect the fatigue properties of pipeline girth welds in a strain-based design which allowed tensile stresses on cool down. Two types of accelerated growth mechanisms were present based on crack tip dissolution and what appeared to be an unknown local embrittlement. Testing showed chemical inhibition could control the first propagation mechanism. Keywords: pipeline, wet natural gas, corrosion fatigue, CO2 corrosion, girth weld, fatigue crack propagation
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