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51315-5820-Environmental Effects on Fitness-for-Service Parameters For 1% Nickel Steel Pipe Welds with Preferential Weld Corrosion Damage

Picture for Environmental Effects on Fitness-for-Service Parameters For 1% Nickel Steel Pipe Welds with Preferen
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Product Number: 51315-5820-SG
ISBN: 5820 2015 CP
Author: Dale McIntyre
Publication Date: 2015
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This study presents slow strain rate notched slow strain rate and compact tension test data on the changes due to environmental exposure in mechanical properties and fracture toughness of 1% nickel steel welds in X-52 offshore platform piping. These strength and toughness parameters serve as input for fitness-for-service analyses of preferential weld corrosion (PWC) damage as either corrosion grooves or crack-like flaws. In 1% nickel steel welds in CO2 environments toughness loss of ca. 35% was observed even in the absence of H2S. Toughness loss of ca. 42% was observed even at H2S levels as low as 100 ppm. Yield and tensile strength were less affected but strain to the onset of plastic instability may be reduced which is a critical parameter for API 579 Level 3 finite element analysis of PWC zones as corrosion grooves. Observed environmental effects depend strongly on whether the weld metal is cathodic or anodic to the nearby base metal.
This study presents slow strain rate notched slow strain rate and compact tension test data on the changes due to environmental exposure in mechanical properties and fracture toughness of 1% nickel steel welds in X-52 offshore platform piping. These strength and toughness parameters serve as input for fitness-for-service analyses of preferential weld corrosion (PWC) damage as either corrosion grooves or crack-like flaws. In 1% nickel steel welds in CO2 environments toughness loss of ca. 35% was observed even in the absence of H2S. Toughness loss of ca. 42% was observed even at H2S levels as low as 100 ppm. Yield and tensile strength were less affected but strain to the onset of plastic instability may be reduced which is a critical parameter for API 579 Level 3 finite element analysis of PWC zones as corrosion grooves. Observed environmental effects depend strongly on whether the weld metal is cathodic or anodic to the nearby base metal.
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51318-10965-Evaluation of Corrosion Inhibitor Functionality on the Mitigation of Preferential Weld Corrosion

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The work conducted produced conditions where preferential weld corrosion initiated in uninhibited conditions and was sustained throughout inhibition. Two types of weld metallurgies; one weld consumable with 1% nickel, the second matched the parent pipe.
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