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Title: CARE AND FEEDING OF ELECTROCHEMICAL OXYGEN ANALYZERS
Author: John Bizzarri
Source: 2022 Appalachian Gas Measurement Short Course
Year Published: 2022
Abstract: Oxygen is the 3rd most abundant element by mass in the universe. While critical for life it is a well-documented issue for natural gas production and transmission. The obvious concern would be avoiding oxygen concentrations that could support combustion but the difficulties for natural gas and the equipment that supports the industry start at much lower levels. Oxygen contamination, even in trace amounts, can pose serious and potentially costly problems in gas plants, transmission lines and gathering systems. Specific areas of concern are: Pipelines - sulfuric acid is formed when oxygen is pres- ent with trace amounts of hydrogen sulfide, carbon dioxide and water. This condition over time can cause corrosion to the interior of piping systems. Dehydration Systems - oxygen will enhance degrada- tion of glycol in dehydration systems and accelerate cor- rosion of the equipment Amine treatment systems - oxygen will react with amines to form heat stable amine salts. The salt forma- tion creates multiple problems for the amine plant. First, they will reduce the overall amine available for acid gas removal which will drive an increase in chemical usage in the plant. Second the salts will form acids that cor- rode and damage systems. Finally, the buildup of salts can be passed downstream and foul valves, piping and heat exchangers. The presence of oxygen in natural gas systems, even sub 10 ppm levels, is both a reality and a concern for systems operators. Understanding how the oxygen enters the sys- tems and what the options are to monitor its levels are critical skills for a successful operation.

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