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' Pipe Class 50 Class 52 <br /> Diameter Minimum Wall Thickness Minimum Wall Thickness <br /> ' ( Inches) (Inches) (Inches) <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. 37 <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 /> ' 1 . 04 FITTINGS <br /> A. All underground fittings shall be either bell and spigot , or <br /> mechanical joint. Mechanical joints shall conform to AWWA <br /> Specification C110 (ANSI 21 . 10-87 ) , or latest revision . All <br /> aboveground fittings shall be flanged joint. <br /> ' B . The pressure rating shall be 250 psi for fittings up to 12 inches <br /> and a minimum of 150 psi for larger sizes . <br /> ' C . All fittings shall be lined with the same material as specified for the <br /> pipe as per paragraph 1 . 05 . <br /> ' 1 . 05 LINING AND COATING <br /> A. Unless otherwise indicated , all ductile iron pipe shall be factory <br /> ' lined and coated . <br /> B . Lining : All pipe shall be cement mortar lined and seal coated in <br /> ' accordance with AWWA Standard C104 (ANSI A21 . 4-85 ) , or <br /> latest revision . <br /> ' C . Coating : Unless specified otherwise , all pipe shall be bituminous <br /> coated outside to a dry film thickness of at least 2 mil . <br /> D . Repair: Anywhere that the coating is removed purposely or <br /> accidentally , the area shall be cleaned of any rust, grease , and dirt <br /> and re-coated to a minimum dry film as specified for the individual <br /> piece . <br /> E . Encasement : If and where directed by IRCDUS , a polyethylene <br /> encasement shall be provided over pipe , fittings , and valves . The <br /> ' 02625 - 2 <br /> F:\Utilities\UTILITY - ENGINEERING\WTP - North RO\N RO Brine Line Discharge - UCP#2208\BID DOCUMENTS North <br /> County RO\BID DOCUMENTS\02625 WM Ductile Iron Pipe and Fittings . doc <br />