In the ductile iron pipe industry, customers often ask: What does the wall thickness of a K9 ductile iron water supply pipe refer to? Today, we will answer this question in detail.
To understand which layer the wall thickness refers to, we first need to understand the structure of ductile iron pipes. Ductile iron pipes consist of four layers from the inside out:
▶ Second layer: Ductile iron – the pressure-bearing main body of the pipe and the core of its strength;
▶ Third layer: Zinc layer – an anti-corrosion protective layer;
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The wall thickness refers specifically to the thickness of the second layer-the ductile iron layer. The "wall thickness" mentioned in the standard specifically refers to the thickness of the cast iron pipe body (ductile iron layer); the cement lining and external anti-corrosion layer are not included in the wall thickness calculation. According to GB/T 13295-2019, the pressure-bearing main body is the intermediate metal layer, and the other three layers are functional protections: an inner lining for corrosion protection and an outer coating for corrosion protection. Therefore, "wall thickness" specifically refers to this metal body layer.
01. Strength Guarantee: Material tensile strength >=420MPa, elongation >=10%. Sufficient wall thickness ensures the pipeline will not crack under complex loads.
02. Pressure Resistance: K9 grade pipes can withstand pressures generally exceeding 1.6MPa, meeting the requirements for high-pressure water transmission. T-type joints allow ±3℃ deflection to adapt to foundation settlement.
03. Service Life: With a cement mortar + zinc layer + asphalt paint anti-corrosion system, the design service life can reach over 50 years.
Our company specializes in the production and sales of ductile iron pipes. We strictly adhere to national standards in our manufacturing processes, ensuring that every pipe meets K9 grade requirements. If you have any purchasing needs or would like to know the specific pipe diameter parameters, please feel free to contact us!
Jintai Cast Foundry, a premium ductile iron pipe brand, boasts superior product quality, rigorous production processes, and a strong market reputation, providing you with reliable product and after-sales service. WhatsApp/WeChat: +86 18334738900 Email: amy@jintaicastfoundry.com