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• Our aviation kerosene silver corrosion test is good, but copper corrosion is bad. What is the possible reason for this situation.

  Jul-2024

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Answers

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• Alexander Vartapetyan, ARBADOX CHEMICALS, alexander.vartapetyan@arbadox.com

  Check the nitrogen content in fuel. Sometimes the native nitrogen (from oil's high-molecular N-substances) or artificial (from reagents) can spoil the copper test.

  Jul-2024

• Marcio Wagner da Silva, Petrobras, marciows@petrobras.com.br

  This is a very interesting question considering that silver is more susceptible to corrosion than copper to sulphur compounds. Nevertheless, it's important to analyse the steam flow rate to the stripping tower in the kerosene hydrotreating unit, a poor performance of the stripping section will drag hydrogen sulfide to the product which will lead to failure to the corrosion tests (both copper and silver). It's important to analyse each step of the production process regarding the contamination with elemental sulphur or mercaptans, in processing units which relies on a caustic treating process to produce jet fuel kerosene, the caustic dragging can be a cause of corrosion in the derivative.

  Another key point to be checked is the presence of sulphate reducing bacteria (SRB) in the storage tanks which can cause failures in the corrosive tests once these bacteria excretes H2S. In this case, the issue can be solved using biocide agents in the tank as well as ensuring a cleaning and draining routine of the kerosene storage tanks which will minimise the risks of SRB presence in the tanks bottom.

   

  Jul-2024