COATING RESISTANCE measurements on buried pipes are made for several reasons including (1) the determination of cathodic protection requirements, (2) the rate of deterioration of the coating, and (3) the maintenance of the pipe free of accidental contact with other buried structures.
As test data on coatings accumulated it was found that coating resistance depends on the quality of construction, resistivity of the soil, the duration of burial, the season of the year, soil temperature, and possibly other factors. Statistical techniques have been found to be very helpful in analyzing and interpreting the test results. This article describes such a study.
In 1947, a 138-kv pipe type cable feeder consisting of a б-inch steel pipe, 41,535 feet long, containing cables, was installed between the Jamaica substation of the Consolidated Edison Company of New York and the Valley Stream substation of the Long Island Lighting Company. The soil was generally a...
