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11094 Black Powder Inhibitors - Performance Study

Picture for 11094 Black Powder Inhibitors - Performance Study
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Product Number: 51300-11094-SG
ISBN: 11094 2011 CP
Author: Abdelmounam M. Sherik, Arnold L Lewis, AbdulJalil H Rasheed and Ali Jabran
Publication Date: 2011
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$20.00
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Sales gas pipeline systems with large diameters and long pipeline lengths can experience the formation of large quantities of corrosion products commonly known as “black powder”. A variety of iron oxides, iron carbonates, iron sulfides, and other contaminants comprise black powder. Black powder formation can be caused by the presence of corrosive gases, including oxygen, carbon dioxide, or hydrogen sulfide dissolved in condensed water in the lines.

Generally, pipeline companies practice various methods to manage and control black powder in their gas network. These methods can be divided broadly into three categories: (a) removal, (b) mitigation, and (c) prevention methods. Mitigation with corrosion inhibitors is typically practiced in lines transporting wet sour gas, and is not normally practiced in sales gas lines.

This paper describes a research study conducted to assess the performance of 14 commercial and specially formulated inhibitors proposed to mitigate the formation of iron oxide based black powder under simulated sales gas conditions. Special, in-house developed, test methods were used to evaluate these inhibitors. Two inhibitors have passed these tests showing a corrosion inhibition effectiveness of approximately 90% and no pitting attack under the simulated sales gas environment.

Keywords: black powder, inhibitors, corrosion, sales gas, pitting.
Sales gas pipeline systems with large diameters and long pipeline lengths can experience the formation of large quantities of corrosion products commonly known as “black powder”. A variety of iron oxides, iron carbonates, iron sulfides, and other contaminants comprise black powder. Black powder formation can be caused by the presence of corrosive gases, including oxygen, carbon dioxide, or hydrogen sulfide dissolved in condensed water in the lines.

Generally, pipeline companies practice various methods to manage and control black powder in their gas network. These methods can be divided broadly into three categories: (a) removal, (b) mitigation, and (c) prevention methods. Mitigation with corrosion inhibitors is typically practiced in lines transporting wet sour gas, and is not normally practiced in sales gas lines.

This paper describes a research study conducted to assess the performance of 14 commercial and specially formulated inhibitors proposed to mitigate the formation of iron oxide based black powder under simulated sales gas conditions. Special, in-house developed, test methods were used to evaluate these inhibitors. Two inhibitors have passed these tests showing a corrosion inhibition effectiveness of approximately 90% and no pitting attack under the simulated sales gas environment.

Keywords: black powder, inhibitors, corrosion, sales gas, pitting.
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11088 Analyses of Black Powder in Natural Gas Pipeline

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Picture for 11092 Effects of Reaction Kinetics of H2S, CO2, and O2 on the Formation of Black Powder
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11092 Effects of Reaction Kinetics of H2S, CO2, and O2 on the Formation of Black Powder in Sales Gas Pipelines

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Black Powder Formation by Dewing and Hygroscopic Corrosion Processes

Product Number: 51317--9029-SG
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Author: Martin Colahan
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Black powder production is poorly understood.  Steel specimens were systematically exposed to a range of CO2, H2S, and O2 partial pressures at differing water condensation rates. Hygroscopic material assisting black powder formation was also investigated.
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