The Florida Everglades has been used for conducting accelerated external corrosion
testing of iron pipe for over 70 years. It contains some of the most corrosive soils in the
world, and is classified by AWWA C105 as a "uniquely severe environment". The
Everglades test site utilized in this study not only contains extremely low soil resistivities
of less than 200 ohm-cm, but also contains tidal brackish water table fluctuations and
high MIC (microbiologically influenced corrosion) activity. This paper
reports on the findings of a five year study in this environment to evaluate different types
of electrical resistance (ER) probes and to compare corrosion rate results obtained from
actual pipe buried in this type of soil. The study evaluated five different types of ER probes (standard steel ER probes with
machined test surfaces from three different manufacturers, specially manufactured ductile
iron ER probes with a machined test surface, and specially manufactured ductile iron ER
probes with an as-cast annealing oxide/peen pattern surface). As the most commonly
utilized method of external corrosion protection for ductile iron pipe is polyethylene
encasement, corrosion rates were also examined utilizing probes under the encasement
and probes buried in the Everglades "muck" adjacent to the test pipe. Comparative
results are given in graphs and tables. Includes 16 references, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.7 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 18 |
| Published : | 11/01/2008 |
