American Society for Testing and Materials (ASTM). Current edition approved Nov. 1, 2010. Published January 2011. Originally approved in 1982. Last previous edition approved in 2006 as A796/A796M - 06. 22 p. This practice covers the structural design of corrugated steel pipe and pipe-arches, ribbed and composite ribbed steel pipe, ribbed pipe with metallic-coated inserts, closed rib steel pipe, composite corrugated steel pipe, and steel structural plate pipe, pipe-arches, and underpasses for use as storm sewers and sanitary sewers, and other buried applications.