1.1 This specification covers polymer precoated, closed rib steel pipe, intended for use for storm water drainage, under-drains, the construction of culverts, and similar uses. Pipe covered by this specification is not normally used for the conveyance This specification deals with polymer precoated, closed rib steel pipes intended for use for storm water drainage, underdrains, the construction of culverts, and similar uses. The pipes covered here are not normally used for conveyance of sanitary or i