{"id":1814,"date":"2025-04-21T09:49:01","date_gmt":"2025-04-21T01:49:01","guid":{"rendered":"https:\/\/www.ductileironsuppliers.com\/?p=1814"},"modified":"2025-06-17T14:46:40","modified_gmt":"2025-06-17T06:46:40","slug":"what-are-k9-and-k7-in-ductile-iron-pipe","status":"publish","type":"post","link":"https:\/\/www.ductileironsuppliers.com\/ar\/what-are-k9-and-k7-in-ductile-iron-pipe.html","title":{"rendered":"\u0645\u0627 \u0647\u0648 K9 \u0648 K7 \u0641\u064a \u0623\u0646\u0627\u0628\u064a\u0628 \u062d\u062f\u064a\u062f \u0627\u0644\u062f\u0643\u062a\u0627\u064a\u0644\u061f"},"content":{"rendered":"

Before diving into specifics, it\u2019s essential to know that the \u201cK\u201d in ductile iron pipe stands for a thickness\u2010class coefficient<\/strong> defined by ISO\u00a02531\/EN\u00a0545, used in the formula<\/p>\n

e=K\u00d7(0.5+0.001\u00d7DN)<\/span><\/span><\/span><\/p>\n

where e<\/strong> is the nominal wall thickness (mm) and DN<\/strong> is the pipe\u2019s nominal diameter (mm). Classes K7<\/strong><\/a>, K8<\/strong><\/a>, K9<\/strong><\/a> and K12<\/strong> represent increasing wall\u2010thickness levels, with K9<\/strong> being the most commonly adopted \u201cstandard\u201d class due to its balance of cost, strength and durability. Compared to pressure\u2010rated C\u2011series pipes, K\u2011series pipes are designed to resist both internal pressures and<\/strong> external loads (soil, traffic), making them ideal for buried mains. Thanks to robust linings and coatings\u2014and when installed with proper backfill and polyethylene sleeving\u2014Class\u00a0K ductile iron pipelines reliably exceed 100\u00a0years<\/strong> of service life.<\/p>\n

\"What<\/a>
What is K9 and K7?<\/figcaption><\/figure>\n

What is k in Ductile Iron Pipe<\/a>?<\/h2>\n