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Evaluation of Preferential Weld Corrosion Susceptibility and Its Mitigation in Slightly Sour Conditions

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Preferential Weld Corrosion (PWC) susceptibility was studied in a slightly sour wet gas piping system using electrochemical methods based on the “hockey puck” technique. Several corrosion inhibitors were evaluated to assess their performance in suppressing PWC.

Product Number: 51315-5640-SG
ISBN: 5640 2015 CP
Author: Ray Case
Publication Date: 2015
Industry: Chemical Inhibitors
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Preferential Weld Corrosion (PWC) susceptibility was studied in slightly sour wet gas piping system using electrochemical methods based on the “hockey puck” technique. By establishing a benchmark testing environment that simulates the operating conditions several corrosion inhibitors were evaluated to assess their performance in suppressing PWC in static conditions.The results show that under the testing conditions the Heat Affected Zones (HAZ) from the welds are susceptible to PWC. Also pitting occurs across all the components of the weld independently of the relative cathode / anode relationship. Profilometry assessment of the specimen after exposure supports the findings from the electrochemical measurements. The corrosion inhibitors dosed at 100 ppm concentration in static conditions show reduction of PWC and pitting severity.

Keywords: Conference Papers, conference Papers 2015, preferenctial weld corrosion, Inhibitors, electrochemical

Preferential Weld Corrosion (PWC) susceptibility was studied in slightly sour wet gas piping system using electrochemical methods based on the “hockey puck” technique. By establishing a benchmark testing environment that simulates the operating conditions several corrosion inhibitors were evaluated to assess their performance in suppressing PWC in static conditions.The results show that under the testing conditions the Heat Affected Zones (HAZ) from the welds are susceptible to PWC. Also pitting occurs across all the components of the weld independently of the relative cathode / anode relationship. Profilometry assessment of the specimen after exposure supports the findings from the electrochemical measurements. The corrosion inhibitors dosed at 100 ppm concentration in static conditions show reduction of PWC and pitting severity.

Keywords: Conference Papers, conference Papers 2015, preferenctial weld corrosion, Inhibitors, electrochemical

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