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51312-01275-Development of Top of Line Corrosion Inhibitors and a Top of Line Corrosion Test Method

Picture for Development of Top of Line Corrosion Inhibitors and a Top of Line Corrosion Test Method
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Product Number: 51312-01275-SG
ISBN: 01275 2012 CP
Author: Alyn Jenkins
Publication Date: 2012
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In multiphase gas pipelines constructed from carbon steel there is a threat to the system integrity due to top of line corrosion. In wet gas pipelines water has a tendency to condense at the top of the pipeline as the temperature and pressure decreases causing corrosion at the 12 o'clock position. This form of corrosion can be very aggressive as the pH of the water may be very low and the water might also not contain any corrosion inhibitor. Preventing top of line corrosion in multiphase systems with inhibitors is very challenging. Inhibitors are required to be transported with the gas phase then partition into the condensed water when necessary and form a protective barrier on the metal surface. A further challenge is the evaluation of inhibitor efficacy in preventing top of line corrosion. Traditional laboratory tests (kettle tests RCE flow loop etc.) are not suitable for this purpose as they are only used to determine the corrosion rate of the bulk water phase. Therefore alternative top of line corrosion test methods are needed. This paper details the work performed to develop a top of line corrosion test method suitable for assessing inhibitor performance. Using the new test method several products have been developed which are effective in preventing top of line corrosion and their test results are discussed. Furthermore a hypothesis is proposed to explain the top of line corrosion inhibition mechanism.
In multiphase gas pipelines constructed from carbon steel there is a threat to the system integrity due to top of line corrosion. In wet gas pipelines water has a tendency to condense at the top of the pipeline as the temperature and pressure decreases causing corrosion at the 12 o'clock position. This form of corrosion can be very aggressive as the pH of the water may be very low and the water might also not contain any corrosion inhibitor. Preventing top of line corrosion in multiphase systems with inhibitors is very challenging. Inhibitors are required to be transported with the gas phase then partition into the condensed water when necessary and form a protective barrier on the metal surface. A further challenge is the evaluation of inhibitor efficacy in preventing top of line corrosion. Traditional laboratory tests (kettle tests RCE flow loop etc.) are not suitable for this purpose as they are only used to determine the corrosion rate of the bulk water phase. Therefore alternative top of line corrosion test methods are needed. This paper details the work performed to develop a top of line corrosion test method suitable for assessing inhibitor performance. Using the new test method several products have been developed which are effective in preventing top of line corrosion and their test results are discussed. Furthermore a hypothesis is proposed to explain the top of line corrosion inhibition mechanism.
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