The San Antonio Water System is soliciting quotes for DUCTILE IRON PIPE. a) All pipes shall conform to the following pressure classes, based upon Type 3 bedding conditions, a depth of bury of 6 feet, and a working pressure of 150 pounds per square inch: 3" through 12" 350 psi; 16" and 20" 250 psi; 24" 200 psi; 30" through 64" 150 psi; b) Dimensions and tolerances for each nominal pipe size shall be in accordance with Table 51.5 (push-on) or Table 51.5 (mechanical joint) of AWWA Standard C151 for pipe with a nominal laying length of 20 feet. c) All pipes shall have an interior cement mortar lining applied in accordance with ANSI/AWWA C104/A21.4, latest revision. No asphaltic coating will be required on the interior cement mortar lining. d) Exterior coating shall consist of a nominal one-mil thick asphaltic material applied to the outside of the pipe as described in Section 51.8 of AWWA C151. e) All rubber joint gaskets utilized on ductile-iron pipe shall be conformance with ANSI/AWWA C111/A21.11 Standard, latest revision.
