{"id":1826,"date":"2025-04-21T14:57:11","date_gmt":"2025-04-21T06:57:11","guid":{"rendered":"https:\/\/www.ductileironsuppliers.com\/?post_type=product&p=1826"},"modified":"2025-04-21T14:57:11","modified_gmt":"2025-04-21T06:57:11","slug":"class-k7-dn200-ductile-iron-pipe-suppliers","status":"publish","type":"product","link":"https:\/\/www.ductileironsuppliers.com\/ar\/product\/class-k7-dn200-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 K7 DN200 \u0645\u0646 \u062d\u062f\u064a\u062f \u0627\u0644\u062f\u0643\u062a\u0627\u064a\u0644"},"content":{"rendered":"

Class K7 DN200 ductile iron pipe<\/a> combines a 200 mm (8\u2033) nominal diameter with a working pressure of 7 bar (\u2248100 psi), making it well suited for medium\u2011pressure water and wastewater networks. Properly installed with cement\u2011mortar lining, zinc external coating, and polyethylene encasement, it can achieve an expected lifespan exceeding 100 years in benign soils or up to 110 years under evolved laying practices. Available in standard 6 m lengths with push\u2011on, mechanical, or restrained joints, it balances rapid installation with robust performance across diverse terrains.<\/p>\n

Application Scenarios<\/h2>\n

Ductile iron\u2019s high strength and ductility support urban water distribution, carrying potable water under steady pressures with minimal friction loss. It excels in pressure sewer systems, where standard classes handle hydraulic transients and surge pressures common at pump stations. For subsea or river crossings, the boltless ball\u2011and\u2011socket joint offers flexibility and restraint against joint separation under subaqueous conditions. Trenchless installations via horizontal directional drilling leverage restrained-flexible joints to replace mains without extensive excavation.<\/p>\n

Service Life<\/h2>\n

Laboratory tests and field data indicate ductile iron pipes can last over 100 years when protected by cement lining and sleeve encasement. In unprotected or highly corrosive soils, lifespans may range from 21 to 40 years, underscoring the value of modern corrosion\u2011control measures.<\/p>\n

\n

 <\/p>\n

\n\n\n\n\n\n\n\n
Protection Level<\/th>\nEstimated Service Life<\/th>\n<\/tr>\n<\/thead>\n
Cement\u2011mortar lining + PE encasement<\/td>\n\u2265 100 years<\/td>\n<\/tr>\n
Zinc coating only<\/td>\n\u2248 50 years<\/td>\n<\/tr>\n
Unprotected in aggressive soils<\/td>\n21\u201340 years<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Installation and Connections<\/h2>\n

Push\u2011on (T\u2011type) joints use elastomeric gaskets to achieve quick, leak\u2011tight assemblies with up to 5\u00b0 angular deflection per joint. Proprietary restrained joints eliminate thrust blocks, cutting excavation and labor costs in thrust\u2011prone installations. In highly corrosive soils, V\u2011Bio\u00ae enhanced polyethylene encasement over zinc\u2011coated pipes further mitigates external corrosion.<\/p>\n

International Standards<\/h2>\n

Class K7 DN200 pipes conform to ISO 2531 for water applications and ISO 4179 for cement\u2011mortar lining. They also meet EN 545 for potable water, EN 598 for sewerage, and AWWA C150\/C151 for centrifugally cast ductile iron pipes in North America.<\/p>\n

Price Comparison with Other Series<\/h2>\n

Indicative pricing for DN200 pipes (USD per meter, subject to volume and coating options):<\/p>\n

\n

 <\/p>\n

\n\n\n\n\n\n\n\n\n
Class<\/th>\nWorking Pressure<\/th>\nPrice Range (USD\/m)<\/th>\n<\/tr>\n<\/thead>\n
K7<\/strong><\/a><\/td>\n7\u00a0bar<\/td>\n400.00\u2013720.00<\/td>\n<\/tr>\n
C30<\/strong><\/td>\n30\u00a0bar (3.0\u00a0MPa)<\/td>\n460.00\u00a0(1\u201399\u00a0t),\u00a0430.00\u00a0(100\u2013999\u00a0t),\u00a0380.00\u00a0(\u2265\u00a01\u00a0000\u00a0t)<\/td>\n<\/tr>\n
K8<\/strong><\/a><\/td>\n8\u00a0bar<\/td>\n485.00\u2013505.00 (min.\u00a010\u00a0t)<\/td>\n<\/tr>\n
K9<\/strong><\/a><\/td>\n9\u00a0bar<\/td>\n597.78\u2013619.65 (min.\u00a020\u00a0t)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Key Advantages<\/h2>\n
    \n
  • \n

    High mechanical strength<\/strong>: Tensile \u2265 420 MPa, yield \u2265 300 MPa, elongation \u2265 10%.<\/p>\n<\/li>\n

  • \n

    Robust corrosion resistance<\/strong>: Internal cement\u2011mortar lining and external zinc\/bitumen coatings extend life in varied soils.<\/p>\n<\/li>\n

  • \n

    Hydraulic efficiency<\/strong>: Smooth linings minimize head loss, reducing pumping costs over decades.<\/p>\n<\/li>\n

  • \n

    Joint flexibility<\/strong>: Push\u2011on and restrained joints accommodate ground movement and seismic activity without leakage.<\/p>\n<\/li>\n

  • \n

    Sustainability<\/strong>: Made from > 90% recycled material; fully recyclable at end\u2011of\u2011life.<\/p>\n<\/li>\n<\/ul>\n

    Frequently Asked Questions<\/h2>\n

    Q1: What defines \u201cClass\u00a0K7\u201d?<\/strong>
    A1: \u201cK7\u201d indicates a nominal working pressure of 7 bar (\u2248100 psi) per ISO 2531 designations.<\/p>\n

    Q2: Why choose DN200?<\/strong>
    A2: DN200 (200 mm) is a globally standard size that balances high throughput for trunk mains with manageable handling and fitting availability.<\/p>\n

    Q3: How is corrosion controlled?<\/strong>
    A3: Standard cement\u2011mortar lining, zinc or bitumen coatings, and optional polyethylene sleeve encasement per ANSI\/AWWA C105 substantially mitigate corrosion.<\/p>\n

    Q4: Which joint types are available?<\/strong>
    A4: Push\u2011on, mechanical (MJ), and self\u2011restrained joints allow contractors to optimize speed, cost, and thrust\u2011resistance per project needs.<\/p>\n

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

      Chiba Prefecture landslide (Japan, 2004)<\/strong>: An NS\u2011type DN200 ductile iron pipeline survived a road collapse with zero damage, maintaining uninterrupted water service<\/p>\n<\/li>\n

    • \n

      Arizona PVC ban (USA)<\/strong>: Eight major Arizona water utilities require ductile iron (often Class K7) over PVC in new distribution mains, prioritizing life\u2011cycle reliability.<\/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":1827,"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-1826","product","type-product","status-publish","has-post-thumbnail","hentry","products-ductile-iron-pipes"],"acf":[],"yoast_head":"\nClass K7 DN200 ductile iron pipe suppliers - 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