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' Materials <br /> Ductile iron pipe furnished for use with wastewater shall be centrifugally cast, lined with 40 mils <br /> DFT of Protecto 401 or approved equal, conforming to ANSI Specifications A21 .6 and A21 . 11 . <br /> All ductile iron pipe shall be manufactured in accordance with AWWA Specification C- 151 and <br /> shall be Class 350 minimum, lined with 40 mils DFT of Protecto 401 or approved equal . Unless <br /> specifically indicated otherwise, underground piping shall be bell and spigot and above ground <br /> ' piping shall be flanged. Cutting of ductile iron pipe shall be by sawing. <br /> Ductile iron pipe shall be bell and spigot cast in accordance with AWWA Specification C151 <br /> ' (ANSI A21 . 51 ) . Cast ductile iron shall have a minimum tensile strength of 60,000 psi with a <br /> minimum yield strength of 42,000 psi. Pipe wall thickness shall be computed in accordance with <br /> AWWA Specification C15046 (ANSI A21 .50) using the physical characteristics cited above <br /> with a minimum working pressure of 350 psi and a laying Condition "Type 2 . " Unless otherwise <br /> indicated or specified herein, the pipe shall have the minimum wall thickness according to class <br /> designation for diameters shown. All pipe shall be given a minimum factory hydrostatic test of <br /> 500 pounds per square inch. <br /> ' Pipe` `Class0 Mm. ` mall 'hickness Class 52 Mm ; Wall Tiickness <br /> ches ,,. rhes ch6 <br /> ' 4 ---- 0.29 <br /> 6 0 . 25 0 . 31 <br /> ' 8 0 .27 0.33 <br /> 10 0 .29 0. 35 <br /> 12 0 . 31 0 . 38 <br /> ' 14 0 .33 0 . 39 <br /> 16 0 . 34 0.40 <br /> 18 0 .35 0 .41 <br /> 20 0.36 0 .42 <br /> 24 0 .38 0.44 <br /> 30 0 .39 0 .47 <br /> ' 36 0 .43 0. 53 <br /> 42 0 .47 0 . 59 <br /> 7 <br />