Problem

  • Soil Side Bottom (SSB) corrosion of a tank that is out of service and has a foundation consisting of an annular plate (chime), compacted sand fill, HDPE lining and concrete ring wall.

Details

  • Large oil corporation; refineries with cone roof tanks experiencing internal corrosion failures
  • Acid gases (H2S/SO2) from stored product condense on the internal roof surfaces and causes severe corrosion leading to pitting corrosion holes and eventual roof failure
  • Even epoxy coated tanks fail in these extremely aggressive environments
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DETAILS CONT.

  • The Underside Drip Tube system of perforated PVC pipes is installed prior to sand fill
  • Once bottom plates are welded in place, Zerion FVS – B-15 inhibitor mixed with water is gravitiy fed into tank SSB space via the drip tubes
  • ER probe readings are taken periodically to verify/validate system performance