AASHTO - American Association of State Highway and Transportation Officials
Scope
"This specification covers reinforced elliptically shaped concrete pipe to be used for the conveyance of sewage@ industrial wastes@ and storm water@ and for the construction of culverts. Pipe designed for placement with the major axis horizontal shall be designated as ""Horizontal Elliptical Pipe."" Pipe designed for placement with the major axis vertical shall be designated as ""Vertical Elliptical Pipe."" This specification is applicable for orders in either SI units (M 207M) or in inch-pound units (M 207). SI units and inch-pound units are not necessarily equivalent. Inch-pound units are shown in brackets in the text for clarity@ but they are the applicable values when the material is ordered to M 207. Note 1??This specification is a manufacturing and purchase specification only@ and does not include requirements for bedding@ backfill@ or the relationship between field load condition and the strength classification of pipe. However@ experience has shown that the successful performance of this product depends upon the proper selection of the class of pipe@ type of bedding and backfill@ and care that the installation conforms to the construction specifications. Owners of the reinforced concrete pipe specified herein are cautioned that they must correlate the field requirements with the class of pipe specified and provide inspection at the construction site."