This standard describes materials and installation procedures for polyethylene encasement to be applied to underground installations of ductile-iron pipe. This standard also may be used for polyethylene encasement of fittings, valves, and other appurtenances to ductile-iron pipe systems.This standard or sections of this standard can be referenced in documents for the purchasing and installation of polyethylene sheet or tubes for corrosion protection of buried ductile-iron pipe, fittings, and appurtenances.