Prestressed Concrete Pressure Pipe, Steel-Cylinder Type
|Publication Date:||19 January 2014|
This standard describes the manufacture of circumferentially prestressed concrete pressure pipe in diameter sizes 16 in. (410 mm) through 144 in. (3,660 mm) manufactured with a steel cylinder and wire reinforcement. Larger sizes have been manufactured based on the concepts presented in this standard. The standard describes two types of prestressed pipe: (1) lined-cylinder pipe with a core composed of a steel cylinder lined with concrete and subsequently wire-wrapped and coated with premixed cement mortar, and (2) embedded-cylinder pipe with a core composed of a steel cylinder encased in concrete and subsequently wire wrapped and coated with premixed cement mortar. The structural design of prestressed concrete pipe for internal pressure and external load is not presented in this standard but is the subject of ANSI/AWWA C304, Design of Prestressed Concrete Cylinder Pipe. ANSI/AWWA C301 also does not include requirements for handling, delivering, laying, field testing, or disinfection of pipe. See AWWA Manual M9, Concrete Pressure Pipe, for this information, as well as for certain supplementary design considerations related to thrust restraint, subaqueous installations, and installation in corrosive environments.
Essential requirements. The pipe shall have the following principal features: a welded steel cylinder with steel joint rings welded to its ends; for linedcylinder pipe, a core consisting of a lining of concrete within the steel cylinder, or for embedded-cylinder pipe, a core consisting of concrete encasing the steel cylinder; reinforcement consisting of high-strength wire wound around the outside of the core in one or more layers at a predetermined tensile stress and fastened securely at its ends; an exterior coating of dense mortar covering the core and wire, except for the necessarily exposed surfaces of the joint rings; and a self-centering joint with a preformed gasket of rubber, designed so that the joint will be watertight under all design conditions. Lined-cylinder pipe shall be used for pipe sizes up to and including 20 in. (510 mm) and may be used for pipe sizes up to and including 60 in. (1,520 mm). Embedded-cylinder pipe may be used for pipe sizes 24 in. (610 mm) through 60 in. (1,520 mm) and shall be used for larger pipe. For embedded-cylinder pipe, at least one-third of the total core thickness shall be outside the cylinder.
The purpose of this standard is to provide the minimum requirements for manufacturing steel-cylinder-type prestressed concrete pressure pipe.