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TABLE 6 . 1 <br /> PRESSURE CLASS <br /> OUTSIDE 300 PSI 350 PSI <br /> SIZE DIAMETER THICKNESS THICKNESS <br /> (INCHES) (INCHES) ( INCHES) ( INCHES) <br /> 3 3 . 96 --- 0 .25 <br /> 4 4 . 80 --- 0 .25 <br /> 6 6 .90 --- 0 . 25 <br /> 8 9 . 05 --- 0 . 25 <br /> 10 11 . 10 --- 0 . 26 <br /> 12 13 .20 -- 0 .28 <br /> 14 15 . 30 0 . 30 0 . 31 <br /> 16 17 .40 0 . 32 0 . 34 <br /> 18 19 . 50 0 . 34 0 . 36 <br /> 20 21 . 60 0 . 36 0 . 38 <br /> 24 25 . 80 0 .40 0 .43 <br /> 30 32 . 00 0 .45 0 .49 <br /> 36 38 .30 0 . 51 0 . 56 <br /> 42 44 . 50 0 . 52 0 . 63 <br /> 48 50 . 80 0 . 64 0 . 70 <br /> 54 57 . 56 0 . 72 0 . 79 <br /> 60 61 .61 0 . 76 0 . 83 <br /> 64 65 .67 0 . 80 0 . 87 <br /> 6 .04 FITTINGS <br /> A. All underground fittings shall be either push-on , restrained , or <br /> mechanical joint. Mechanical joints shall conform to AWWA <br /> Standard Specification C110/A21 . 10-98 ) or C153/A21 . 53 -00 ) , <br /> or latest revisions . All aboveground fittings shall be flanged <br /> joint . <br /> B . The pressure rating shall be 350 psi . <br /> C . All fittings shall be lined with the same material as specified for the <br /> pipe , as per paragraph 6 . 05 . <br /> 6 . 05 LINING AND COATING <br /> A . Unless otherwise indicated , all ductile iron pipes shall be <br /> factory lined and coated . <br /> B . Lining : For 4 " and larger, the interior of the pipe shall have a <br /> fusion- bonded ceramic epoxy lining . The epoxy material <br /> shall be applied in 1 coat with a minimum dry film thickness <br /> of 40 . 0 mils , see Approved Manufacturer' s Product List. If <br /> and where directed by IRCDUS , a polyethylene encasement shall <br /> be provided over pipes and fittings . <br /> 6 - 2 <br />