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
  • cs-2-r-1
  • cs-2-r-2
  • cs-2-r-3
  • cs-2-r-4
  • cs-2-r-5
  • cs-3-r-6
  • cs-2-r-1
  • cs-2-r-2
  • cs-2-r-3
  • cs-2-r-4
  • cs-2-r-5
  • cs-2-r-6

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