“Our district is faced with thousands of deteriorated centerline roadway pipes,” says Ruth Betcher, P.E., hydraulics engineer for the Minnesota Department of Transportation’s (MNDOT) District 6, “and replacing all that pipe is cost prohibitive—and also, citizens don’t welcome detours!”
Currently, MNDOT uses cured in place pipe (CIPP) and HDPE pipe relining extensively, but both have disadvantages: CIPP is expensive and HDPE decreases hydraulic capacity due to reduced inner pipe diameter—HDPE also requires at least 25 feet of clear area for staging.
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