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Soil corrosion of a buried pipeline is aggravated by soil that is

  • A.free of dissolved salts of any kind
  • B.moist and of low electrical resistivity
  • C.dry and of high electrical resistivity
  • D.uniformly aerated along the whole pipe

Answer: B

A conductive soil lets the corrosion currents flow freely and the moisture provides the electrolyte, so resistivity surveys are used to identify the worst stretches. Differential aeration along the route sets up long-line currents in addition.

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