{"id":1867,"date":"2025-04-22T17:02:12","date_gmt":"2025-04-22T09:02:12","guid":{"rendered":"https:\/\/www.ductileironsuppliers.com\/?post_type=product&p=1867"},"modified":"2025-04-22T17:02:12","modified_gmt":"2025-04-22T09:02:12","slug":"class-k8-dn250-ductile-iron-pipe-suppliers","status":"publish","type":"product","link":"https:\/\/www.ductileironsuppliers.com\/ar\/product\/class-k8-dn250-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 K8 DN250"},"content":{"rendered":"

Class\u00a0K8 DN250<\/strong> ductile iron pipe has a nominal wall thickness of 6.0\u00a0mm<\/strong> per ISO\u00a02531 (K\u00a0=\u00a08) , offers PN\u00a012.5 (1.25\u00a0MPa)<\/strong> working pressure, and delivers a 100\u00a0+\u00a0year<\/strong> service life with cement\u2011mortar lining and polyethylene sleeving. It installs rapidly via push\u2011on (\u201cTyton\u201d), mechanical or flanged joints compliant with ISO 2531, AWWA C111 and EN 1092. Compared with adjacent thickness classes (K7\u21926.0 mm, K9\u21926.8 mm, K12\u21929.0 mm), K8 balances cost (\u2248 $500\u2013600 USD\/ton) and performance.<\/p>\n

Applications<\/h2>\n

Potable Water Distribution<\/strong>
Class K8 DN250 pipe ensures leak\u2011tight delivery in municipal networks, resisting internal pressure fluctuations and maintaining water quality .<\/p>\n

Sewage & Drainage<\/strong>
Its abrasion\u2011resistant iron core and robust lining handle grit\u2011laden wastewater under gravity or forced mains .<\/p>\n

Irrigation Systems<\/strong>
Uniform hydraulic performance and surge resistance support agricultural supply lines and farm sprinklers.<\/p>\n

Gas Distribution<\/strong>
When produced per EN 969 and coated externally, DN250 K8 pipe safely conveys natural gas in medium\u2011pressure networks.<\/p>\n

Fire\u2011Protection Mains<\/strong>
High ductility and surge tolerance make it ideal for fire\u2011water loops and hydrant feeder mains.<\/p>\n

Service Life<\/h2>\n

Uncoated ductile iron in benign soils lasts >\u00a0100\u00a0years<\/strong>, with cement\u2011mortar linings and polyethylene sleeving extending that to 110\u00a0years<\/strong> under optimal conditions . A Black\u00a0&\u00a0Veatch study estimated a $17\u00a0million<\/strong> present\u2011value savings over 50 years (3 % annual O&M reduction) when using DIP vs. PVC.<\/p>\n

Installation & Connection<\/h2>\n
    \n
  • \n

    Push\u2011On (\u201cTyton\u201d) Joints<\/strong>: Spigot\u2011socket with elastomeric gasket enables rapid, bolt\u2011free assembly per ISO 2531 socket dimensions.<\/p>\n<\/li>\n

  • \n

    Mechanical Joints<\/strong>: Gland\u2011and\u2011bolt restraint per AWWA C111 for fittings and valve connections, offering axial restraint where needed.<\/p>\n<\/li>\n

  • \n

    Flanged Joints<\/strong>: ANSI B16.1 or EN 1092 flanges allow disassembly for maintenance and resist axial loads.<\/p>\n<\/li>\n

  • \n

    Best Practices<\/strong>: Trenches require 150 mm well\u2011graded bedding, deflection limits \u2264 3 % of DN, hydrostatic testing and disinfection per ISO 2531\/AWWA C600 guidelines.<\/p>\n<\/li>\n<\/ul>\n

    K\u2011Series Comparison & Pricing<\/h2>\n
    \n

     <\/p>\n

    \n\n\n\n\n\n\n\n\n
    Class<\/th>\nWall Thickness (mm)<\/th>\nPressure Rating<\/th>\nPrice (USD\/ton)<\/th>\n<\/tr>\n<\/thead>\n
    K7<\/strong><\/td>\ne\u00a0=\u00a07\u00d7(0.5\u00a0+\u00a00.001\u00a0\u00d7\u00a0250)\u00a0=\u00a06.0<\/td>\nPN10 (1.0\u00a0MPa)<\/td>\n$480 \u2013 530<\/td>\n<\/tr>\n
    K8<\/strong><\/td>\ne\u00a0=\u00a08\u00d7(0.5\u00a0+\u00a00.001\u00a0\u00d7\u00a0250)\u00a0=\u00a06.0<\/td>\nPN12.5 (1.25\u00a0MPa)<\/td>\n$500 \u2013 600<\/td>\n<\/tr>\n
    K9<\/strong><\/td>\ne\u00a0=\u00a09\u00d7(0.5\u00a0+\u00a00.001\u00a0\u00d7\u00a0250)\u00a0=\u00a06.8<\/td>\nPN16 (1.6\u00a0MPa)<\/td>\n$545 \u2013 645<\/td>\n<\/tr>\n
    K12<\/strong><\/td>\ne = 12\u00d7(0.5 + 0.001 \u00d7 250) = 9.0<\/td>\nPN25 (2.5\u00a0MPa)<\/td>\n$750 \u2013 900<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n

    Wall\u2011thickness formula: e=K (0.5 + 0.001 \u00d7 DN)<\/em>.<\/p>\n<\/blockquote>\n

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

      ISO\u00a02531:2009 \/ EN\u00a0545:2006<\/strong> \u2013 Pipe dimensions, linings, joint performance .<\/p>\n<\/li>\n

    • \n

      GB\/T\u00a013295\u20112019<\/strong> \u2013 Chinese specification for DIP, fittings & joints in water\/gas systems .<\/p>\n<\/li>\n

    • \n

      ISO\u00a08180:2020<\/strong> \u2013 Polyethylene encasement for external corrosion control .<\/p>\n<\/li>\n

    • \n

      ANSI\/AWWA\u00a0C111\/A21.11<\/strong> \u2013 Mechanical joint specifications.<\/p>\n<\/li>\n

    • \n

      EN\u00a0969<\/strong> \u2013 Gas\u2011pipeline ductile iron pipe, fittings & accessories requirements.<\/p>\n<\/li>\n<\/ul>\n

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

        Exceptional Longevity<\/strong>: 100\u00a0+\u00a0year service life reduces replacements .<\/p>\n<\/li>\n

      • \n

        High Strength & Toughness<\/strong>: Tensile \u2265\u00a0420\u00a0MPa resists surge and external loads .<\/p>\n<\/li>\n

      • \n

        Superior Corrosion Control<\/strong>: Internal cement\u2011mortar, zinc\/bitumen coatings, LPS.<\/p>\n<\/li>\n

      • \n

        Versatile Joint Options<\/strong>: Push\u2011on, mechanical, flanged, restrained systems for site\u2011specific needs.<\/p>\n<\/li>\n

      • \n

        Sustainable<\/strong>: Fully recyclable with lower life\u2011cycle energy use vs. thermoplastics .<\/p>\n<\/li>\n<\/ul>\n

        FAQ<\/h2>\n

        Q1: How do K classes differ?<\/strong>
        They follow e=K\u00a0(0.5+0.001\u00a0DN)<\/em>: for DN250, K7\/K8=6.0 mm, K9=6.8 mm, K12=9.0 mm, matching PN 10\/12.5\/16\/25 respectively.<\/p>\n

        Q2: What lining & coating options exist?<\/strong>
        Cement\u2011mortar, epoxy or ceramic internal linings; external bitumen, zinc or polyethylene sleeving per ISO 8180.<\/p>\n

        Q3: Is DIP suitable for corrosive soils?<\/strong>
        Yes\u2014with loose polyethylene encasement or cathodic protection, DIP achieves 100 + year life in aggressive environments.<\/p>\n

        Q4: What sizes & lengths are offered?<\/strong>
        Standard DN\u00a080\u20132600\u00a0mm in 6\u00a0m (5.7\u00a0m for containers) laying lengths, custom cuts on demand .<\/p>\n

        Q5: Can DIP be used in seismic areas?<\/strong>
        Yes\u2014restrained joints (tie\u2011rod, ball\u2011and\u2011socket) absorb ground movement for seismic resilience.<\/p>\n

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

          Huntsville Utilities, AL<\/strong>: Black\u00a0&\u00a0Veatch found $17\u00a0million<\/strong> PV savings over 50 years (3 % annual O&M reduction) vs. PVC mains.<\/p>\n<\/li>\n

        • \n

          Everglades City, FL<\/strong>: DIP with polyethylene encasement remained in \u201cexcellent condition\u201d after 10+\u00a0years<\/strong> in corrosive muck (140\u2013240 \u03a9\u2011cm).<\/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":1868,"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-1867","product","type-product","status-publish","has-post-thumbnail","hentry","products-ductile-iron-pipes"],"acf":[],"yoast_head":"\nClass K8 DN250 ductile iron pipe suppliers - Jingang LuoKaiwei<\/title>\n<meta name=\"description\" content=\"Class\u00a0K8\u00a0DN250 ductile iron pipe: applications, 100+\u00a0year lifespan, installation methods, K7\u2013K12 comparison, standards, FAQs & real\u2011world case studies\u2014durable & reliable solution.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ductileironsuppliers.com\/ar\/product\/class-k8-dn250-ductile-iron-pipe-suppliers\/\" \/>\n<meta property=\"og:locale\" content=\"ar_AR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Class K8 DN250 ductile iron pipe suppliers - Jingang LuoKaiwei\" \/>\n<meta property=\"og:description\" content=\"Class\u00a0K8\u00a0DN250 ductile iron pipe: applications, 100+\u00a0year lifespan, installation methods, K7\u2013K12 comparison, standards, FAQs & real\u2011world case studies\u2014durable & reliable solution.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ductileironsuppliers.com\/ar\/product\/class-k8-dn250-ductile-iron-pipe-suppliers\/\" \/>\n<meta property=\"og:site_name\" content=\"Jingang LuoKaiwei\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ductileironsuppliers.com\/wp-content\/uploads\/2025\/04\/tfk1k-q0yf4.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"720\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.ductileironsuppliers.com\\\/product\\\/class-k8-dn250-ductile-iron-pipe-suppliers\",\"url\":\"https:\\\/\\\/www.ductileironsuppliers.com\\\/product\\\/class-k8-dn250-ductile-iron-pipe-suppliers\",\"name\":\"Class K8 DN250 ductile iron pipe suppliers - 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