Sodium Chlorate Transfer Line Corrosion Failure & New Material Study, 19PEERS

Preventing leaks in chemical transport lines is essential in minimizing product loss and preventing personnel safety issues.  Sodium chlorate used in the production of chlorine dioxide (ClO2) has caused numerous failures in existing piping materials resulting in increased maintenance expense and emergency temporary repairs.  This paper reviews the reasons behind historical material choices, the difficulties encountered with our current system, and new materials that are currently being tested.  It also includes diagnostics on previous material failures along with availability and cost evaluation of current vs. potential replacement options.

This investigation evaluated the viability of using Duplex 2205 in sodium chlorate transfer systems versus more traditional materials.  The availability and costs were compared to what is currently used and were found to be comparable.  After conducting the examination, it was decided to implement several test sections of pipeline to prove out the material change.  If the new sections show no signs of failure in the coming months, the remainder of the system will be changed over as well.

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