This standard covers the manufacture of concrete pressure pipe, reinforced with a steel cylinder that is helically wrapped with mild steel bar reinforcement, in sizes ranging from 10 in. through 60 in. (250 mm through 1,520 mm), inclusive, and for working pressures up to 400 psi (2,760 kPa). Larger pipe sizes and pipe accommodating higher pressures have been manufactured based on the concepts of this standard. With agreement by the purchaser and the manufacturer, pipe may be manufactured to larger sizes and for higher pressures than indicated herein. This standard does not include requirements for design, handling, delivering, laying, field testing, or disinfecting of pipe and fittings. The pipe shall have the following principal features: a welded steel cylinder with sized steel joint rings welded to the ends; a lining of concrete or cement mortar centrifugally applied within the steel cylinder and spigot ring; reinforcement consisting of continuous steel bar helically wound tightly around the outside of the cylinder and securely fastened by welding to the steel joint ring at each end of the cylinder; a coating of dense mortar covering the cylinder and bars, except for the necessarily exposed surfaces of the spigot joint ring; and a self-centering joint with a preformed gasket of rubber, so designed that the joint will be watertight under all conditions of service. The major revisions in this edition of ANSI/AWWA C303 include the following: The title of this standard has been modified to describe more accurately the type of pipe covered under this standard; The format has been changed to reflect current AWWA standard style; The acceptance clause (Sec. I.C) and the definitions of parties (Sec. 3) have been revised to approved wording; The prevailing range in pipe diameters has been changed to 10 in. through 60 in. (250 mm through 1,520 mm) (Sec. 1.1); Use of ASTM C150 type III cement has been allowed (Sec. 4.4.1.1); Reference to the use of pozzolan as a cement replacement has been deleted (Sec. 4.4.1.1); Requirements for submitting samples of aggregates have been deleted (former Sec 2.3); A minimum yield strength of 30,000 psi (207 MPa) for cylinder and fittings steel is required (Sec. 4.4.5.1); Minimum testing and measuring frequency for steel cylinder material is required and thickness tolerances are established (Sec. 4.4.5.5 and Sec. 4.4.5.6); The average circumferential stress in the cylinder and bar reinforcement of the pipe has been increased at working pressure from 16,500 psi (114 MPa) to 18,000 psi (124 MPa) and at working pressure plus surge pressure from 24,750 psi (171 MPa) to 27,000 psi (186 MPa) (Sec. 4.5.2.2); The requirements for rubber gaskets have been expanded to include splices, testing, and storage (Sec. 4.5.4); A qualification requirement for all welders, welding operators, and welding procedures has been added (Sec. 4.6.2 and Sec. 4.6.3); Cylinder weld-seam alignment tolerances have been established (Sec. 4.6.4.2.1); Cylinder weld sampling and testing requirements have been expanded to include bend and etching tests (Sec. 4.6.4.2.5 and Sec. 4.6.4.2.6); The minimum cylinder hydrostatic test pressure has been increased to that pressure causing a cylinder stress of 75 percent of the minimum yield point of the steel used, or as specified by the purchaser (Sec. 4.6.4.3); A minimum rate for application of slurry immediately prior to placement of bar reinforcement has been added (Sec. 4.6.6.3); The minimum allowable mortar-coating-batch moisture content has been increased (Sec. 4.6.7.2); A requirement for checking mortar-coating thickness on every pipe has been added (Sec. 4.6.7.2); A minimum rate for application of slurry immediately prior to placement of cement-mortar coating has been added (Sec. 4.6.7.2); A requirement for testing mortar-coating absorption has been added (Sec. 4.6.7.3); A requirement for checking the soundness of the mortar coating on each pipe has been added (Sec. 4.6.7.4); A requirement for the manufacturer to maintain a quality-assurance program has been added (Sec. 5.1.3); A requirement for welding inspection qualification has been added (Sec. 5.1.3.1); A requirement for test-equipment calibration has been added (Sec. 5.2.8); and Design procedures have been moved from the former appendix A of this standard to AWWA Manual M9.