I have a project that requires jacking & boring 400 feet of 48-inch pipe. The pipe will be used as a storm drain, and no separate casing pipe is to be installed. The pipe is to have 10 to 12 feet of cover and will operate under pressure flow. There is a concern with the use of steel pipe because the soils are aggressive (pH = 4.4, resistivity = 18,400, Chlorides = 33, and Sulfates = 16). If the steel is coated to improve its resistance to corrosion, the coating could be damaged by welding the pipe or from friction as the pipe is pushed through the soil. Any suggestions as to a suitable alternate to steel for a sleeveless jack & bore pipe?
Please keep in mind that a casing larger than 48" is undesirable due to surrounding properties and utilities.
Jim Lee, P.E. City of Tallahassee Stormwater Division
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