{"id":2023,"date":"2025-04-24T16:50:36","date_gmt":"2025-04-24T08:50:36","guid":{"rendered":"https:\/\/www.ductileironsuppliers.com\/?post_type=product&p=2023"},"modified":"2025-04-24T16:50:36","modified_gmt":"2025-04-24T08:50:36","slug":"class-51-ductile-iron-pipe-suppliers","status":"publish","type":"product","link":"https:\/\/www.ductileironsuppliers.com\/ar\/product\/class-51-ductile-iron-pipe-suppliers","title":{"rendered":"\u0645\u0648\u0631\u062f\u0648 \u0623\u0646\u0627\u0628\u064a\u0628 \u062d\u062f\u064a\u062f \u0627\u0644\u062f\u0643\u062a\u0627\u064a\u0644 \u0645\u0646 \u0627\u0644\u0641\u0626\u0629 51"},"content":{"rendered":"

Class 51 ductile iron pipe is a special-thickness class defined in ANSI\/AWWA C150\/A21.50 and C151\/A21.51, offering wall thicknesses intermediate between Classes 50 and 52 for sizes 3\u2033\u201324\u2033 and designed to withstand rated working pressures plus a 100 psi surge allowance. It is often mandated as the minimum thickness<\/strong> for pipes 14\u2033 and larger in many municipal water-main specifications, ensuring robustness for transmission mains . With centrifugally applied cement-mortar lining<\/strong> (ANSI\/AWWA C104) and optional polyethylene encasement (ANSI\/AWWA C105), Class 51 pipelines routinely exceed 100 years<\/strong> of service life in normal soils. Installation is flexible\u2014supporting push-on (C111), mechanical (C110), restrained and flanged joints\u2014facilitating rapid, leak-tight assembly for potable, wastewater and industrial systems. Fully compliant with AWWA C150\/C151, C104\/C105, C110\/C111 and international ISO 2531, EN 545\/598 standards, Class 51 offers competitive life-cycle performance compared to Classes 52<\/a>, 53<\/a>, 150<\/a>, 250<\/a> and 350<\/a>.<\/p>\n

Application Scenarios<\/h2>\n

Class 51 ductile iron pipe excels in:<\/p>\n

    \n
  • \n

    High-pressure transmission mains<\/strong> (14\u2033+): Meets minimum thickness requirements for large-diameter pipelines in suburban and inter-city networks.<\/p>\n<\/li>\n

  • \n

    Water treatment plant outlets<\/strong>: Withstands continuous flow and occasional surge events, preserving integrity over decades.<\/p>\n<\/li>\n

  • \n

    Gravity and force sewage mains<\/strong>: Cement-mortar lining resists tuberculation in aggressive wastewater applications, reducing cleaning cycles.<\/p>\n<\/li>\n

  • \n

    Irrigation and agricultural conveyance<\/strong>: Low Hazen\u2013Williams friction factor (C\u2248140) cuts pumping energy vs. PVC alternatives.<\/p>\n<\/li>\n

  • \n

    Industrial process loops<\/strong>: Flanged joints allow rigid connections to pumps and valves in chemical and power plants.<\/p>\n<\/li>\n<\/ul>\n

    Service Life<\/h2>\n
      \n
    • \n

      100+ years<\/strong> in typical burial conditions when lined and encased per AWWA standards.<\/p>\n<\/li>\n

    • \n

      Cement-mortar lining<\/strong> virtually eliminates internal corrosion, maintaining hydraulic capacity over a century.<\/p>\n<\/li>\n

    • \n

      Life-cycle cost analyses<\/strong> show DI mains outperform PVC and other materials in total cost of ownership over 100 years.<\/p>\n<\/li>\n<\/ul>\n

      Installation and Connection<\/h2>\n

      Push-On & Mechanical Joints<\/h3>\n
        \n
      • \n

        Push-on joints<\/strong> (ANSI\/AWWA C111) feature a simple rubber gasket for fast, trench-side assembly without bolting.<\/p>\n<\/li>\n

      • \n

        Mechanical joints<\/strong> (ANSI\/AWWA C110) use a gland and bolts compressing an elastomeric gasket; rated up to 350 psi for restrained service.<\/p>\n<\/li>\n<\/ul>\n

        Restrained & Flanged Systems<\/h3>\n
          \n
        • \n

          Restrained joints<\/strong> (e.g., Field-Lok\u00ae) lock spigot and bell to resist thrust forces, reducing need for concrete thrust blocks.<\/p>\n<\/li>\n

        • \n

          Flanged ends<\/strong> (ANSI B16.1\/250 psi or AWWA C207) bolt directly to valves, pumps and metering, enabling rigid, dismantlable connections.<\/p>\n<\/li>\n<\/ul>\n

          Corrosion Protection<\/h3>\n
            \n
          • \n

            Internal lining<\/strong>: Cement-mortar per ANSI\/AWWA C104 creates a high-pH barrier against tuberculation.<\/p>\n<\/li>\n

          • \n

            External coatings<\/strong>: Options include bonded zinc, asphaltic enamel or epoxy; polyethylene sleeving per AWWA C105 in aggressive soils .<\/p>\n<\/li>\n<\/ul>\n

            International Standards<\/h2>\n
              \n
            • \n

              ANSI\/AWWA C150\/A21.50 & C151\/A21.51<\/strong>: Pressure-class thickness design and centrifugal casting.<\/p>\n<\/li>\n

            • \n

              ANSI\/AWWA C104\/A21.4 & C105\/A21.5<\/strong>: Cement-mortar lining and PE encasement specifications.<\/p>\n<\/li>\n

            • \n

              ANSI\/AWWA C110\/A21.10 & C111\/A21.11<\/strong>: Mechanical and push-on joint requirements.<\/p>\n<\/li>\n

            • \n

              ISO 2531:2012<\/strong>, EN 545<\/strong>, EN 598<\/strong>: International benchmarks for DI pipes and fittings.<\/p>\n<\/li>\n<\/ul>\n

              Comparative Parameters (Classes 51, 52, 53, 150, 250, 350)<\/h2>\n
              \n

               <\/p>\n

              \n\n\n\n\n\n\n\n\n\n\n
              Class<\/th>\nRated Pressure<\/th>\nSurge Allowance<\/th>\nJoint Types<\/th>\nDiameters<\/th>\n<\/tr>\n<\/thead>\n
              51<\/strong><\/td>\nSpecial-thickness (adequate for rated pressure)<\/td>\n100 psi<\/td>\nPush-on, MJ, restrained, flanged<\/td>\n3\u2033\u201364\u2033 (\u226514\u2033 min spec)<\/td>\n<\/tr>\n
              52<\/strong><\/td>\n200 psi<\/td>\n100 psi<\/td>\nMechanical only<\/td>\n3\u2033\u201364\u2033<\/td>\n<\/tr>\n
              53<\/strong><\/td>\n250 psi<\/td>\n100 psi<\/td>\nMechanical only<\/td>\n3\u2033\u201364\u2033<\/td>\n<\/tr>\n
              150<\/strong><\/td>\n150 psi<\/td>\n100 psi<\/td>\nPush-on, MJ, restrained, flanged<\/td>\n3\u2033\u201364\u2033<\/td>\n<\/tr>\n
              250<\/strong><\/td>\n250 psi<\/td>\n100 psi<\/td>\nPush-on, MJ, restrained, flanged<\/td>\n3\u2033\u201364\u2033<\/td>\n<\/tr>\n
              350<\/strong><\/td>\n350 psi<\/td>\n100 psi<\/td>\nPush-on, MJ, restrained,<\/td>\n3\u2033\u201364\u2033<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

              Advantages<\/h2>\n
                \n
              • \n

                Tailored Thickness Control:<\/strong> Class 51 bridges the gap between standard classes for customized wall designs .<\/p>\n<\/li>\n

              • \n

                Longevity:<\/strong> Cement-mortar lining and encasement deliver 100+ year lifespan.<\/p>\n<\/li>\n

              • \n

                High Strength:<\/strong> Meets AWWA tensile\/impact criteria under deep cover and surge loads .<\/p>\n<\/li>\n

              • \n

                Joint Flexibility:<\/strong> Multiple joint systems optimize installation speed and reliability.<\/p>\n<\/li>\n

              • \n

                Sustainability:<\/strong> Up to 60 % recycled iron content; fully recyclable at end-of-life.<\/p>\n<\/li>\n<\/ul>\n

                Frequently Asked Questions<\/h2>\n
                  \n
                1. \n

                  What is Class 51?<\/strong>
                  A \u201cspecial thickness\u201d designation in AWWA C150\/C151 that specifies intermediate wall thicknesses \u2013 often used as the minimum for pipes \u2265 14\u2033.<\/p>\n<\/li>\n

                2. \n

                  How does Class 51 differ from Class 52?<\/strong>
                  Class 51 has slightly thinner walls (.26\u2033\u2013.41\u2033) than Class 52 (.28\u2033\u2013.44\u2033) for the same diameter, offering marginally lower material cost yet adequate for rated pressures plus surge.<\/p>\n<\/li>\n

                3. \n

                  Can Class 51 handle aggressive soils?<\/strong>
                  Yes\u2014combine with AWWA C105 polyethylene encasement or epoxy coatings for high-chloride or stray-current protection .<\/p>\n<\/li>\n

                4. \n

                  Which joint type installs fastest?<\/strong>
                  Push-on joints require minimal excavation and no bolts, reducing trench time.<\/p>\n<\/li>\n

                5. \n

                  What sizes are available?<\/strong>
                  Nominal diameters from 3\u2033 to 64\u2033, with agency specs often requiring Class 51 for 14\u2033 and larger.<\/p>\n<\/li>\n<\/ol>\n

                  Case Studies<\/h2>\n
                    \n
                  • \n

                    Charleston, SC (1922\u20132019):<\/strong> Flow tests on the first cement-mortar lined iron pipe showed a Hazen\u2013Williams C \u2248 131<\/strong> after 97 years<\/strong>, underscoring DI longevity.<\/p>\n<\/li>\n

                  • \n

                    University of Michigan LCCA:<\/strong> An LCCA comparing 8\u2033 Class 51 mains versus PVC demonstrated lower total cost of ownership<\/strong> over 100 years (internal U-of-M report).<\/p>\n<\/li>\n

                  • \n

                    Huntsville, AL Water Utility:<\/strong> A Black & Veatch study found DI replacement reduced annual O&M by 3 %, equating to $17 million<\/strong> PV savings over 50 years.<\/p>\n<\/li>\n<\/ul>\n

                    ductile iron pipe dimensions<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
                    <\/td>\n<\/td>\n<\/td>\nPipe body weight \uff08kg\/m)<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
                    (Inside Diameter)<\/td>\n(Outside Diameter)<\/td>\nSocket Weight<\/td>\nK8<\/td>\nK9<\/td>\nK10<\/td>\nC class<\/td>\nTotal weight of Active Length=6M (kg)<\/td>\nTotal weight of Active Length=5.7M (kg)<\/td>\n<\/tr>\n
                    DN(mm)<\/td>\nOD(mm)<\/td>\n\u2248 kg<\/td>\nClass<\/td>\nkg\/m<\/td>\nK8<\/td>\nK9<\/td>\nK10<\/td>\nC class<\/td>\nK8<\/td>\nK9<\/td>\nK10<\/td>\nC class<\/td>\n<\/tr>\n
                    80<\/td>\n98<\/td>\n3.40<\/td>\n12.20<\/td>\n12.20<\/td>\n12.20<\/td>\nC40<\/td>\n9.10<\/td>\n77.00<\/td>\n77.00<\/td>\n77.00<\/td>\n58.00<\/td>\n73.00<\/td>\n73.00<\/td>\n73.00<\/td>\n55.00<\/td>\n<\/tr>\n
                    100<\/td>\n118<\/td>\n4.30<\/td>\n14.90<\/td>\n15.10<\/td>\n15.10<\/td>\nC40<\/td>\n11.12<\/td>\n93.70<\/td>\n95.00<\/td>\n95.00<\/td>\n71.00<\/td>\n90.00<\/td>\n91.00<\/td>\n90.00<\/td>\n68.00<\/td>\n<\/tr>\n
                    125<\/td>\n144<\/td>\n5.70<\/td>\n<\/td>\n18.90<\/td>\n<\/td>\nC40<\/td>\n<\/td>\n<\/td>\n119.00<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
                    150<\/td>\n170<\/td>\n7.10<\/td>\n21.80<\/td>\n22.80<\/td>\n22.80<\/td>\nC40<\/td>\n16.48<\/td>\n138.00<\/td>\n144.00<\/td>\n144.00<\/td>\n106.00<\/td>\n132.00<\/td>\n138.00<\/td>\n137.00<\/td>\n101.00<\/td>\n<\/tr>\n
                    200<\/td>\n222<\/td>\n10.30<\/td>\n28.70<\/td>\n30.60<\/td>\n30.60<\/td>\nC40<\/td>\n22.62<\/td>\n183.00<\/td>\n194.00<\/td>\n194.00<\/td>\n146.00<\/td>\n174.00<\/td>\n185.00<\/td>\n185.00<\/td>\n139.00<\/td>\n<\/tr>\n
                    250<\/td>\n274<\/td>\n14.20<\/td>\n35.60<\/td>\n40.20<\/td>\n44.30<\/td>\nC40<\/td>\n32.63<\/td>\n228.00<\/td>\n255.00<\/td>\n280.00<\/td>\n210.00<\/td>\n218.00<\/td>\n244.00<\/td>\n267.00<\/td>\n200.00<\/td>\n<\/tr>\n
                    300<\/td>\n326<\/td>\n18.90<\/td>\n45.30<\/td>\n50.80<\/td>\n56.30<\/td>\nC30<\/td>\n43.90<\/td>\n290.00<\/td>\n323.00<\/td>\n357.00<\/td>\n282.00<\/td>\n278.00<\/td>\n309.00<\/td>\n340.00<\/td>\n269.00<\/td>\n<\/tr>\n
                    350<\/td>\n378<\/td>\n23.70<\/td>\n55.90<\/td>\n63.20<\/td>\n69.60<\/td>\nC30<\/td>\n51.88<\/td>\n359.00<\/td>\n403.00<\/td>\n441.00<\/td>\n335.00<\/td>\n343.00<\/td>\n384.00<\/td>\n420.00<\/td>\n319.00<\/td>\n<\/tr>\n
                    400<\/td>\n429<\/td>\n29.50<\/td>\n67.30<\/td>\n75.50<\/td>\n83.70<\/td>\nC30<\/td>\n60.78<\/td>\n433.00<\/td>\n482.00<\/td>\n532.00<\/td>\n394.00<\/td>\n414.00<\/td>\n460.00<\/td>\n506.00<\/td>\n376.00<\/td>\n<\/tr>\n
                    450<\/td>\n480<\/td>\n38.30<\/td>\n80.00<\/td>\n89.30<\/td>\n99.00<\/td>\nC30<\/td>\n73.30<\/td>\n515.00<\/td>\n575.00<\/td>\n632.00<\/td>\n472.00<\/td>\n492.00<\/td>\n550.00<\/td>\n597.00<\/td>\n450.00<\/td>\n<\/tr>\n
                    500<\/td>\n532<\/td>\n42.80<\/td>\n92.80<\/td>\n104.30<\/td>\n115.60<\/td>\nC30<\/td>\n87.20<\/td>\n600.00<\/td>\n669.00<\/td>\n736.00<\/td>\n566.00<\/td>\n572.00<\/td>\n638.00<\/td>\n702.00<\/td>\n540.00<\/td>\n<\/tr>\n
                    600<\/td>\n635<\/td>\n59.30<\/td>\n122.00<\/td>\n137.30<\/td>\n152.00<\/td>\nC30<\/td>\n120.62<\/td>\n791.00<\/td>\n882.00<\/td>\n971.00<\/td>\n783.00<\/td>\n755.00<\/td>\n842.00<\/td>\n926.00<\/td>\n747.00<\/td>\n<\/tr>\n
                    700<\/td>\n738<\/td>\n79.10<\/td>\n155.00<\/td>\n173.90<\/td>\n193.00<\/td>\nC25<\/td>\n142.15<\/td>\n1009.00<\/td>\n1123.00<\/td>\n1237.00<\/td>\n932.00<\/td>\n963.00<\/td>\n1071.00<\/td>\n1179.00<\/td>\n889.00<\/td>\n<\/tr>\n
                    800<\/td>\n842<\/td>\n102.60<\/td>\n192.00<\/td>\n215.20<\/td>\n239.00<\/td>\nC25<\/td>\n177.07<\/td>\n1255.00<\/td>\n1394.00<\/td>\n1537.00<\/td>\n1165.00<\/td>\n1197.00<\/td>\n1330.00<\/td>\n1465.00<\/td>\n1112.00<\/td>\n<\/tr>\n
                    900<\/td>\n945<\/td>\n129.60<\/td>\n232.00<\/td>\n260.20<\/td>\n289.00<\/td>\nC25<\/td>\n197.68<\/td>\n1521.00<\/td>\n1691.00<\/td>\n1863.00<\/td>\n1446.00<\/td>\n1452.00<\/td>\n1613.00<\/td>\n1777.00<\/td>\n1257.00<\/td>\n<\/tr>\n
                    1000<\/td>\n1048<\/td>\n161.30<\/td>\n275.00<\/td>\n309.30<\/td>\n343.20<\/td>\nC25<\/td>\n266.28<\/td>\n1811.00<\/td>\n2017.00<\/td>\n2221.00<\/td>\n1759.00<\/td>\n1729.00<\/td>\n1925.00<\/td>\n2118.00<\/td>\n1679.00<\/td>\n<\/tr>\n
                    1100<\/td>\n1152<\/td>\n194.70<\/td>\n<\/td>\n362.80<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n2372.00<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
                    1200<\/td>\n1255<\/td>\n237.70<\/td>\n374.00<\/td>\n420.10<\/td>\n466.10<\/td>\nC25<\/td>\n373.88<\/td>\n2482.00<\/td>\n2758.00<\/td>\n3034.00<\/td>\n2481.00<\/td>\n2370.00<\/td>\n2632.00<\/td>\n2894.00<\/td>\n2369.00<\/td>\n<\/tr>\n
                    1400<\/td>\n1462<\/td>\n279.30<\/td>\n<\/td>\n547.20<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n3563.00<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                    ductile iron pipe\u00a0Mechanical property<\/h2>\n\n\n\n\n\n\n\n\n\n
                    Mechanical Property<\/td>\n<\/tr>\n
                    Nominal Diameter<\/td>\nHydraulic test<\/td>\nTensile strength<\/td>\nElogation<\/td>\nYield strength<\/td>\nBending strength<\/td>\nBrinell hardness<\/td>\nThickness of cement lining<\/td>\n<\/tr>\n
                    DN(MM)<\/td>\nMpa<\/td>\nMpa<\/td>\n%<\/td>\nMpa<\/td>\nMpa<\/td>\nHB<\/td>\nmm<\/td>\n<\/tr>\n
                    DN80-DN300<\/td>\n5<\/td>\n\u2265420<\/td>\n\u226510<\/td>\n\u2265300<\/td>\n\u2265590<\/td>\n\u2264230<\/td>\n3<\/td>\n<\/tr>\n
                    DN350-DN600<\/td>\n4<\/td>\n\u2265420<\/td>\n\u226510<\/td>\n\u2265300<\/td>\n\u2265590<\/td>\n\u2264230<\/td>\n5<\/td>\n<\/tr>\n
                    DN700-DN1000<\/td>\n3.2<\/td>\n\u2265420<\/td>\n\u226510<\/td>\n\u2265300<\/td>\n\u2265590<\/td>\n\u2264230<\/td>\n6<\/td>\n<\/tr>\n
                    DN1100-DN1600<\/td>\n2.5<\/td>\n\u2265420<\/td>\n\u22657<\/td>\n\u2265300<\/td>\n\u2265590<\/td>\n\u2264230<\/td>\n\u2026..<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":2024,"template":"","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"tags":[],"products":[10],"class_list":["post-2023","product","type-product","status-publish","has-post-thumbnail","hentry","products-ductile-iron-pipes"],"acf":[],"yoast_head":"\nClass 51 ductile iron pipe suppliers - 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