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E3 <br />AMERICAN Ductile Iron Pipe <br />ANSI/AWWA C150/A21.50 <br />and <br />ANSI/AWWA C151/A21.51 <br />Nominal Wall Thicknesses for Special Thickness Classes <br />Table No. 3-12 <br />Outside <br />SPECIAL THICKNESS CLASSES -Wall Thickness in Inches* <br />Size <br />in. <br />Diameter <br />50 <br />57 <br />52 <br />53 <br />54 <br />55 <br />56 <br />in. <br />4 <br />4.80 <br />- <br />.26 <br />.29 <br />.32 <br />.35 <br />.38 <br />.41 <br />6 <br />6.90 <br />.25 <br />.28 <br />.31 <br />.34 <br />.37 <br />.40 <br />.43 <br />8 <br />9.05 <br />.27 <br />.30 <br />.33 <br />.36 <br />.39 <br />.42 <br />.45 <br />10 <br />11.10 <br />.29 <br />.32 <br />.35 <br />.38 <br />.41 <br />.44 <br />.47 <br />12 <br />13.20 <br />.31 <br />.34 <br />.37 <br />.40 <br />.43 <br />.46 <br />.49 <br />14 <br />15.30 <br />.33 <br />.36 <br />.39 <br />.42 <br />.45 <br />.48 <br />.51 <br />16 <br />17.40 <br />.34 <br />.37 <br />.40 <br />.43 <br />.46 <br />.49 <br />.52 <br />18 <br />19.50 <br />.35 <br />.38 <br />.41 <br />.44 <br />.47 <br />.50 <br />.53 <br />20 <br />21.60 <br />.36 <br />.39 <br />.42 <br />.45 <br />.48 <br />.51 <br />.54 <br />24 <br />25.80 <br />.38 <br />.41 <br />.44 <br />.47 <br />.50 <br />.53 <br />.56 <br />30 <br />32.00 <br />.39 <br />.43 <br />.47 <br />.51 <br />.55 <br />.59 <br />.63 <br />36 <br />38.30 <br />.43 <br />.48 <br />.53 <br />.58 <br />.63 <br />.68 <br />.73 <br />42 <br />44.50 <br />.47 <br />.53 <br />.59 <br />.65 <br />.71 <br />.77 <br />.83 <br />48 <br />50.80 <br />.51 <br />.58 <br />.65 <br />.72 <br />.79 <br />.86 <br />.93 <br />54 <br />1 57.56 <br />1 .57 <br />.65 <br />1 .73 <br />1 .81 <br />.89 <br />.97 <br />1 1.05 <br />*These are Special Thickness Classes as shown in AWWA C150 and C151. They were previously designated standard <br />thickness classes. AMERICAN can furnish any thickness in between these Special Thicknesses if deemed economical for <br />major projects. <br />Special classes are most appropriately used for some threaded, grooved, or ball and socket pipes or for extraordinary <br />design conditions, and they are generally less available than standard pressure class pipe. <br />For pressure rating and maximum depth of cover capabilities of Special Thickness Classes, check AMERICAN. These <br />capabilities can be estimated by comparing metal thickness and capabilities of those of Pressure Classes in Table No. <br />3-11, or may be calculated by using the design formulas shown in AWWA C150. <br />3-20 <br />