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The Corrosion Forum: Internal Liner material...Help!

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    • CommentAuthorgfergus
    • CommentTimeAug 6th 2009
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    Does anyone have any experience with liner material for application on pipework with internal corrosion/erosion?

    The pipes are designed to hold hot methanol and water in both liquid and vapour form.

    Normal operating conditions for the pipes:

    Temperature
    • Average temp - 172F
    • Max temp - 267.1F

    Pressure
    • Average internal pipe pressure - 5.4 PSIG
    • Max internal pipe pressure - 15 PSIG

    Acidity level
    • pH level of ~3.5-5.5

    Chloride level
    • 90000 – 120000ppm


    Process treatment in the pipes consists of:

    1) Oxygen Scavenger
    2) Scale Inhibitor
    3) Corrosion Inhibitor (organic)
    4) Defoamer (silicon polymer)

    Failure mechanisms/ Anomalies detected include:

    • Weld root corrosion
    • Pitting corrosion
    • Synergistic effect of erosion/corrosion
    • Impingement corrosion

    If anyone has experience with using an internal liner or lining material with applications similar to the above any feedback would be much appreciated.

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