K7 K9 Ductile Iron Pipes

About K7 K9 Ductile Iron Pipes

K7 and K9 Ductile Iron (DI) pipes”manufactured to standards like IS:8329”are high-strength piping solutions used globally for water supply, sewage, and gas transmission. The designations K7 and K9 denote the wall thickness class and pressure-withbearing capacity of the pipe, with K9 offering a thicker wall and higher structural robustness than K7

Key Differences Between K7 and K9 Classes

• Wall Thickness: K9 pipes have a thicker nominal wall than K7 pipes for the same diameter size.
• Pressure Rating: K9 handles higher operating pressures and severe surge/water hammer conditions compared to K7.
• Weight: K9 pipes are heavier per meter due to the extra metal thickness.
• Application Preference: K9 is frequently used in high-pressure main distribution lines and deeper burial conditions, whereas K7 is chosen for moderate-pressure or specific gravity flow setups.

• Common Specifications & Properties

  • Standard Compliance: IS:8329 for ductile iron socket, spigot, and flanged pipes.
  • Standard Lengths: Available in 5.5 or 6-meter effective lengths.
  • Diameters: Ranging generally from 80mm up to 1200mm.
  • Coatings: External metallic zinc coating with finishing layers, and internal cement mortar lining for smooth fluid flow and corrosion protection.
  • Tensile Strength: Minimum 420 MPa
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