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r r SECTION 4 GRAVITY SANITARY SEWERS DUCTILE IRON PIPE 4.01 SCOPE r This section covers ductile iron pipe and fittings for gravity sanitary sewers . r 4.02 GENERAL r A. Ductile iron pipe shall be allowed for use as gravity sewer pipe where compatible with the specific conditions of the project. The use of material other than ductile iron may be required by Indian River County Department of Utility Services ( IRCDUS) during construction permit review or by IRCDUS field personnel during construction if it is determined that ductile iron pipe is unsuitable for the particular application . r B. All ductile iron pipes shall be manufactured in accordance with AWWA Standard Specifications C150/A21 . 50-96 and r C151 /A21 . 51 -96, or latest revisions, and shall be pressure Class 300 or 350 minimums, as depicted on Table 4. 1 on page 4-2 . All ductile iron pipe crossing under roadways shall be pressure Class 350 minimum . C . Unless specifically indicated otherwise, underground piping shall r be bell and spigot, mechanical joint, or restrained joint and aboveground piping shall be flanged . D. Cutting of ductile iron pipe shall be by sawing only. r 4. 03 PIPE r Ductile iron pipe shall be bell and spigot cast in accordance with the latest AWWA Standard Specifications C150/A21 . 50-96 and C151 /A21 . 51 -96 . Cast ductile iron shall have a minimum tensile strength of 60 , 000 psi with .. a minimum yield strength of 42 , 000 psi . Pipe wall thicknesses shall be computed in accordance with AWWA Standard Specifications C150/A21 . 50-96, using the physical characteristics cited above with a minimum working pressure of 200 psi and a Laying Condition "Type 2 . " Unless otherwise indicated or specified herein , the pipe shall have the minimum wall thickness according to class designation for diameters r shown . All pipes shall be given a minimum factory hydrostatic test of 500 psi . r r 4 - 1 r