Piping materials for public works projects. Defines "acceptable piping material" as piping material that: (1) meets certain recognized standards; and (2) meets the performance specifications for the public works contract. Provides, for purposes of the law on public works projects of state agencies and political subdivisions, including design-build public works projects, that the specifications or design criteria package must allow bidding in open competition for acquisition of acceptable piping materials for use in the public works project. Provides, however, that a public works project's engineer is not limited in selecting any acceptable piping materials that meet the requirements of the public works project.