{"id":2017,"date":"2025-04-24T16:23:08","date_gmt":"2025-04-24T08:23:08","guid":{"rendered":"https:\/\/www.ductileironsuppliers.com\/?post_type=product&p=2017"},"modified":"2025-04-24T16:23:08","modified_gmt":"2025-04-24T08:23:08","slug":"class-350-ductile-iron-pipe-suppliers","status":"publish","type":"product","link":"https:\/\/www.ductileironsuppliers.com\/ar\/product\/class-350-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 \u0641\u0626\u0629 350"},"content":{"rendered":"

Class 350 ductile iron pipe is engineered for demanding water and sewage applications, providing a nominal working pressure of 350 psi (with a 100 psi surge allowance) per ANSI\/AWWA C150\/A21.50-91. Its spheroidal-graphite iron microstructure combined with shop-applied cement-mortar lining delivers an expected service life exceeding 100 years in normal soil conditions. Installation is streamlined by a full suite of joint options\u2014push-on, mechanical, restrained and flanged\u2014backed by elastomeric gaskets and Field-Lok\u00ae 350 restraint systems. It meets global standards (ANSI\/AWWA C104\/A21.4, C105\/A21.5, C110\/A21.10 and ISO 2531\/EN 545\/EN 598) for dimensions, lining, encasement and joint performance. Though Class 350 lists at roughly USD 100\u2013110 per m\u2014well below typical Class 52 (USD 450\u2013650\/m)and Class 53 (USD 500\u2013560\/m) and comparable to K9 (USD 370\u2013430\/m)\u2014the combination of low friction losses, minimal maintenance and unparalleled durability yields superior life-cycle value.<\/p>\n

Application Scenarios<\/h2>\n

Municipal Water Distribution:<\/strong> Ideal for high-pressure potable mains in urban networks, where leak-tight mechanical and restrained joints ensure system integrity under dynamic loads.
Wastewater and Sewage Systems:<\/strong> Cement-mortar lining prevents tuberculation in gravity and force mains, reducing cleaning and rehabilitation costs.
Agricultural Irrigation:<\/strong> Low Hazen\u2013Williams friction factor (C\u2009\u2248\u2009140) cuts pumping energy by up to 15% over PVC alternatives, per life-cycle cost studies.
Industrial and Process Piping:<\/strong> Flanged Class 350 fittings are standard in power plants and chemical facilities, offering high impact resistance and flexibility for above-ground runs.<\/p>\n

Service Life<\/h2>\n

Modern ductile iron pipe routinely achieves 100 + years<\/strong> of uninterrupted service when installed with proper bedding and protective measures.
Cement-mortar linings virtually eliminate internal corrosion (\u201ctuberculation\u201d), maintaining high flow capacity over decades.
Comparative life-cycle analyses show Class 350 DI outperforms PVC in total cost of ownership over a 100-year design horizon.<\/p>\n

Installation and Jointing<\/h2>\n

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

Push-on joints use a single rubber gasket and minimal bell-hole excavation, enabling rapid, trench-side assembly.
Mechanical joints rated for Class 350 incorporate Field-Lok\u00ae 350 restraint gaskets to resist thrust forces without thrust blocks.<\/p>\n

Restrained & Flanged Connections<\/h3>\n

Restrained-joint pipe harnesses integral coupling glands and gaskets to lock spigot and bell under pressure surges, eliminating separation risks.
Flanged ends (4\u2033\u201312\u2033) bolt directly to valves or equipment via Flex-Ring\u00ae gaskets, ensuring leak-free, rigid connections in pump stations.<\/p>\n

Corrosion Protection<\/h3>\n

Internal Lining:<\/strong> Centrifugally applied cement-mortar per ANSI\/AWWA C104\/A21.4 offers a smooth barrier for potable and nonaggressive wastewater service.
External Coatings:<\/strong> Options include bonded zinc, asphaltic-base or water-borne epoxy coatings to withstand soil acidity and moisture.
Polyethylene Encasement:<\/strong> Loose-sleeve encasement per AWWA C105\/A21.5 protects against stray currents and aggressive soils.<\/p>\n

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

    ANSI\/AWWA C151\/A21.51:<\/strong> DI pipe dimensions and physical requirements.<\/p>\n<\/li>\n

  • \n

    ANSI\/AWWA C150\/A21.50-91:<\/strong> Pressure-class thickness tables for working and surge allowances.<\/p>\n<\/li>\n

  • \n

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

  • \n

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

  • \n

    ISO 2531:2012, EN 545 & EN 598:<\/strong> Global standards for DI pipe and fittings, covering dimensions, linings and jointing.<\/p>\n<\/li>\n<\/ul>\n

    Price Comparison with Classes 52, 53 & K Series<\/h2>\n
    \n

     <\/p>\n

    \n\n\n\n\n\n\n\n\n
    Class<\/th>\nPrice Range (USD\/m)<\/th>\n<\/tr>\n<\/thead>\n
    52<\/strong><\/td>\n450 – 650<\/td>\n<\/tr>\n
    53<\/strong><\/td>\n500 \u2013 560<\/td>\n<\/tr>\n
    350<\/strong><\/td>\n100 \u2013 110<\/td>\n<\/tr>\n
    K9<\/strong><\/td>\n370 \u2013 430<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Note: Prices vary by diameter, coating, region and order volume; life-cycle efficiency often outweighs higher upfront costs.<\/em><\/p>\n<\/blockquote>\n

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

      Exceptional Durability:<\/strong> 100 + year lifespan reduces replacement cycles.<\/p>\n<\/li>\n

    • \n

      High Strength:<\/strong> Meets AWWA tensile and impact standards for trench loads and surge events.<\/p>\n<\/li>\n

    • \n

      Corrosion Resistance:<\/strong> Internal linings and external coatings virtually eliminate deterioration.<\/p>\n<\/li>\n

    • \n

      Installation Flexibility:<\/strong> Multiple joint types adapt to soil, pressure and alignment conditions.<\/p>\n<\/li>\n

    • \n

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

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

        What does \u201cClass 350\u201d mean?<\/strong>
        A pressure-class designation indicating a nominal working pressure of 350 psi with surge allowance, per ANSI\/AWWA C150 tables.<\/p>\n<\/li>\n

      2. \n

        How is internal corrosion prevented?<\/strong>
        Cement-mortar linings applied per ANSI\/AWWA C104\/A21.4 form a chemical barrier against tuberculation.<\/p>\n<\/li>\n

      3. \n

        Can it resist aggressive soils?<\/strong>
        Yes\u2014polyethylene encasement (AWWA C105) and external epoxy coatings guard against stray currents and acidic ground.<\/p>\n<\/li>\n

      4. \n

        Which joint type offers fastest assembly?<\/strong>
        Push-on joints with simple gaskets require minimal excavation and no field bolting, speeding installation.<\/p>\n<\/li>\n

      5. \n

        What diameters are available?<\/strong>
        Nominal sizes from 3\u2033 to 64\u2033 per ANSI\/AWWA C151.<\/p>\n<\/li>\n<\/ol>\n

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

          100 Year Charleston Main:<\/strong> First cement-lined iron mains in Charleston, SC (installed 1922) provided uninterrupted service until 2022, demonstrating DI longevity.<\/p>\n<\/li>\n

        • \n

          Michigan Life-Cycle Analysis:<\/strong> A 1 000 ft, 8\u2033 Class 350 mains project in Michigan showed DI\u2019s lower total cost versus PVC over a 100-year design life.<\/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":2018,"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 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