PEFTEC - Abstract

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Abstract Title: Detection of Corrosive Gases in live pipeline products
Abstract Type: Seminar
Session Choice: On-Line Chromatography and Spectroscopy
Seminar Time: Wednesday : Room 6 - 11.00 - 11.30
Presenter Name: Mr Beth Constable
Co-authors:Mr Timon Huybrighs
Mr Christophe Clarysse
Mr Lee Marotta
Mr Chris Goss
Company/Organisation: PerkinElmer
Country: United Kingdom

Abstract Information :

Sediment material from corrosion (containing magnetic iron (oxide based)) has been found accumulating in pumps, valves, on pigs and in line inspection tools. In more viscous streams, the solids may be suspended in the stream and not result in the same operational issues, however they may cause issues in tankage with settling. Condensates are low viscosity and have limited ability for solids retention, so the issue may appear more readily in these lines.

Some of the key players in corrosion are oxygen (O2), carbon dioxide (CO2) and hydrogen sulfide (H2S). These can cause corrosion when present in the low ppm to ppb range. At this time, a robust, reliable method to detect trace levels of dissolved corrosion gases (O2, H2S and CO2) in pipeline products does not exist. Headspace gas chromatography (GC) and gas oil ratio (GOR) techniques have previously been considered and/or evaluated, however they will not work for the trace amounts of dissolved gas that are to be detected.

A method was developed that uses a liquid phase injection, a backflush so the fixed gas column does not get contaminated, and a sensitive detector. Low ppm detection limits were achieved.