{"id":1984,"date":"2025-04-24T13:43:59","date_gmt":"2025-04-24T05:43:59","guid":{"rendered":"https:\/\/www.ductileironsuppliers.com\/?post_type=product&p=1984"},"modified":"2025-04-24T13:43:59","modified_gmt":"2025-04-24T05:43:59","slug":"class-k12-dn350-ductile-iron-pipe-suppliers","status":"publish","type":"product","link":"https:\/\/www.ductileironsuppliers.com\/ar\/product\/class-k12-dn350-ductile-iron-pipe-suppliers","title":{"rendered":"\u0645\u0648\u0631\u0651\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 K12 DN350"},"content":{"rendered":"

Class K12 DN350 ductile iron pipe combines a 350 mm nominal diameter<\/strong> with a 12 bar working pressure<\/strong>, offering an optimal balance of strength, corrosion resistance, and hydraulic performance for modern infrastructure projects. Its cement-mortar internal lining and fusion-bonded epoxy or bitumen external coatings ensure a service life exceeding 100 years<\/strong>, outperforming many alternative materials in full-life cost analyses. Multiple jointing systems\u2014including push-on, mechanical, and self-restraining\u2014allow rapid, leak-tight assembly in both trench and trenchless environments. Fully compliant with ISO 2531<\/strong>, EN 545<\/strong>, EN 598<\/strong>, ASTM A 536<\/strong>, and GB 13295<\/strong>, these pipes meet global standards for potable water, wastewater, fire-fighting, and industrial applications.<\/p>\n

Application Scenarios<\/h2>\n

Municipalities deploy DN350 K12 pipes for potable water distribution<\/strong>, where the smooth cement-mortar lining resists biofilm formation and maintains water quality under varying flow regimes. In wastewater and sewer force mains<\/strong>, their 12 bar rating and abrasion-resistant lining reduce friction losses and extend maintenance intervals in high-flow systems. Fire-fighting networks leverage DN350\u2019s high flow capacity and heat-resistant coatings to deliver rapid, high-pressure water supply to hydrants and sprinklers in industrial parks and large facilities. In industrial plants<\/strong>, these pipes convey process water, cooling fluids, and chemicals, benefitting from ductile iron\u2019s impact resistance and dimensional stability under cyclic loads. For trenchless installations<\/strong> such as HDD and river crossings, DN350\u2019s weight, ductility, and coated exterior guard against soil movement, stray currents, and subaqueous corrosion.<\/p>\n

Service Life<\/h2>\n

Modern ductile iron pipe is engineered to last 100 years or more<\/strong>, as documented by the Ductile Iron Pipe Research Association\u2019s Longevity program and century-old mains still in operation today. Lifecycle cost analyses show that over a century, DN350 K12 pipelines can yield significant net present value savings<\/strong> compared to PVC or HDPE alternatives, driven by lower energy losses and fewer repairs.<\/p>\n

Installation & Jointing<\/h2>\n

Push-On Joints<\/h3>\n

EPDM-gasketed bell-and-spigot assemblies allow quick, tool-light connections<\/strong>, maintaining leak-tight seals up to 12 bar without supplementary restraints.<\/p>\n

Mechanical Joints<\/h3>\n

Megalug\u00ae mechanical restraints clamp to standard flanged ends, providing axial thrust restraint<\/strong> and accommodating pressures well above 12 bar without external blocking .<\/p>\n

Self-Restraining Joints<\/h3>\n

Integral locking lugs in the bell eliminate the need for concrete thrust blocks, accelerating installation<\/strong> at bends and tees while ensuring joint integrity under dynamic loads.<\/p>\n

Corrosion Protection & Encasement<\/h3>\n

Polyethylene encasement per ANSI\/AWWA C105\/A21.5 wraps each barrel and joint, blocking stray currents<\/strong> and aggressive soil chemistries to sustain >100 years of service in corrosive environments.<\/p>\n

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

    ISO 2531:2015<\/strong> \u2013 Ductile iron pipes, fittings, linings, and joints for water pipelines.<\/p>\n<\/li>\n

  • \n

    EN 545:2010<\/strong> \u2013 Standards for water supply ductile iron pipes and fittings.<\/p>\n<\/li>\n

  • \n

    EN 598:2007<\/strong> \u2013 Guidelines for sewerage ductile iron pipes, fittings, and accessories.<\/p>\n<\/li>\n

  • \n

    ASTM A 536<\/strong> \u2013 Material specifications for ductile iron castings in pressure pipe systems.<\/p>\n<\/li>\n

  • \n

    GB 13295-2019<\/strong> \u2013 Chinese national standard for ductile cast iron pipes and coatings.<\/p>\n<\/li>\n<\/ul>\n

    Price Comparison<\/h2>\n
    \n

     <\/p>\n

    \n\n\n\n\n\n\n\n\n
    Series \/ Class<\/th>\nTypical DN350 Price (USD\/m)<\/th>\nSource<\/th>\n<\/tr>\n<\/thead>\n
    Class K9<\/strong><\/td>\n430 \u2013 470<\/td>\nAlibaba<\/span><\/span><\/span><\/span><\/td>\n<\/tr>\n
    Class K12<\/strong><\/td>\n450 \u2013 700<\/td>\nAlibaba<\/span><\/span><\/span><\/span><\/td>\n<\/tr>\n
    PN10 (C25)<\/strong><\/td>\n400 \u2013 550<\/td>\nAlibaba<\/span><\/span><\/span><\/span><\/td>\n<\/tr>\n
    PN16 (C30)<\/strong><\/td>\n500 \u2013 650<\/td>\nAlibaba<\/span><\/span><\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

    Note: Prices vary by coating, joint type, order volume, and region. Consult local suppliers for exact quotes.<\/em><\/p>\n

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

      Centennial Durability:<\/strong> Proven >100 year service life reduces replacement cycles and downtime.<\/p>\n<\/li>\n

    • \n

      High Pressure Rating:<\/strong> 12 bar working pressure supports fire mains and industrial networks without upsizing.<\/p>\n<\/li>\n

    • \n

      Corrosion Resistance:<\/strong> Combination of cement-mortar lining and epoxy\/bitumen coatings protects internal and external surfaces.<\/p>\n<\/li>\n

    • \n

      Installation Flexibility:<\/strong> Adaptable joint systems and encasement options suit trench, trenchless, seismic, and subaqueous conditions.<\/p>\n<\/li>\n

    • \n

      Environmental Sustainability:<\/strong> High recycled-iron content and full recyclability align with circular-economy goals.<\/p>\n<\/li>\n<\/ul>\n

      Frequently Asked Questions<\/h2>\n

      Q1: What does \u201cDN350\u201d mean?<\/strong>
      \u201cDN350\u201d denotes a nominal internal diameter<\/strong> of 350 mm, standardized under ISO 2531 and related specifications.<\/p>\n

      Q2: What defines \u201cClass K12\u201d?<\/strong>
      \u201cK-class\u201d categories indicate pressure ratings in bar; Class K12 pipes are rated for 12 bar working pressure<\/strong> with thicker walls than K9 or C-class equivalents.<\/p>\n

      Q3: Which joint type is best?<\/strong><\/p>\n

        \n
      • \n

        Push-on<\/strong> for fast, low-tool installations<\/p>\n<\/li>\n

      • \n

        Mechanical<\/strong> for axial restraint and easy disassembly<\/p>\n<\/li>\n

      • \n

        Self-restraining<\/strong> for minimal excavation and thrust blocking<\/p>\n<\/li>\n<\/ul>\n

        Q4: Are DN350 pipes suitable for trenchless methods?<\/strong>
        Yes\u2014ductile iron\u2019s flexural ductility, combined with restrained joints and coatings, enables HDD<\/strong> and microtunnelling<\/strong> installations with minimal surface disruption.<\/p>\n

        Q5: How long will these pipes last?<\/strong>
        With proper installation, jointing, and corrosion control, DN350 K12 pipes typically exceed 100 years<\/strong> of reliable service.<\/p>\n

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

          Brussels Renewal (Belgium):<\/strong> A 440 m section of DN350 water main was rehabilitated using trenchless Primus Liner\u00ae, completed in just four days with minimal surface disruption.<\/p>\n<\/li>\n

        • \n

          California HDD Crossing (USA):<\/strong> A DN350 K9 trunk main installed via HDD with restrained joints cut installation time by 40%<\/strong> and avoided extensive excavation along a sensitive riverbank .<\/p>\n<\/li>\n

        • \n

          Kobe Earthquake Resilience (Japan):<\/strong> Pre-1995 S\u2161-type DN350 ductile iron mains remained intact after 1.3 m ground subsidence, showcasing exceptional seismic performance .<\/p>\n<\/li>\n

        • \n

          U.S. Municipal Upgrades:<\/strong> Multiple DIPRA case studies report zero failures<\/strong> and a 70% reduction<\/strong> in break rates after replacing aging mains with Class K ductile iron systems over two decades.<\/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":1985,"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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