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The Florida Everglades has been used for conducting accelerated external corrosiontesting of iron pipe for over 70 years. It contains some of the most corrosive soils in theworld, and is classified by AWWA C105 as a "uniquely severe environment". TheEverglades test site utilized in this study not only contains extremely low soil resistivitiesof less than 200 ohm-cm, but also contains tidal brackish water table fluctuations andhigh MIC (microbiologically influenced corrosion) activity. This paperreports on the findings of a five year study in this environment to evaluate different typesof electrical resistance (ER) probes and to compare corrosion rate results obtained fromactual pipe buried in this type of soil. The study evaluated five different types of ER probes (standard steel ER probes withmachined test surfaces from three different manufacturers, specially manufactured ductileiron ER probes with a machined test surface, and specially manufactured ductile iron ERprobes with an as-cast annealing oxide/peen pattern surface). As the most commonlyutilized method of external corrosion protection for ductile iron pipe is polyethyleneencasement, corrosion rates were also examined utilizing probes under the encasementand probes buried in the Everglades "muck" adjacent to the test pipe. Comparativeresults are given in graphs and tables. Includes 16 references, figures.

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Edition: Vol. - No. Published: 11/01/2008 Number of Pages: 18File Size: 1 file , 1.7 MB