10 Things You Need to Know About Ductile Iron Pipe Corrosion Resistance

Ductile iron pipe is a popular choice in water and wastewater infrastructure projects. It is known for its strength, durability, and relatively low cost compared to other materials like steel or concrete. However, like any material, ductile iron pipe is not immune to corrosion. Here are 10 things you need to know about ductile iron pipe corrosion resistance.

1. Corrosion is a natural process.

Corrosion occurs when metal is exposed to oxygen and moisture over time. It is a natural process that can't be completely prevented but can be managed.

2. Ductile iron pipe has natural corrosion resistance.

Ductile iron pipe is composed of iron, carbon, and silicon. These elements give it natural corrosion resistance, especially in alkaline soils and waters.

3. External corrosion prevention is critical.

The external surface of ductile iron pipe is vulnerable to corrosion in acidic soils, high chloride environments, and stagnant water. Therefore, external coatings and Cathodic Protection systems must be used to prevent external corrosion.

4. Internal corrosion can occur.

While ductile iron pipe has natural corrosion resistance, internal corrosion can occur from microbiologically influenced corrosion in water service environments and hydrogen sulfide-induced corrosion. Therefore, protective coatings and liners are recommended.

5. Corrosion affects pipe performance.

Corrosion can reduce the structural integrity and water-tightness of ductile iron pipe. Corrosion by-products can also cause blockages and reduced capacity.

6. Corrosion management is vital.

Corrosion management strategies such as cathodic protection, protective coatings, and liners can prolong the life of ductile iron pipe assets.

7. Cathodic protection can prevent corrosion.

Cathodic protection prevents corrosion by making the ductile iron pipe the cathode and inducing an electric current to flow from a more easily corroded anodic metal to the ductile iron pipe.

8. Protective coatings and liners are effective.

Protective coatings and liners prevent corrosion by creating a barrier between the ductile iron pipe and the corrosive environment.

9. Regular inspections are important.

To manage corrosion effectively, regular inspections of ductile iron pipe assets are necessary. These inspections can detect corrosion before it worsens and allows repairs or replacements to be made promptly.

10. Proper maintenance is essential.

Proper maintenance of ductile iron pipe assets is essential to maximize their performance and lifespan. Maintaining protective coatings, liners, cathodic protection systems, and regularly inspecting for corrosion are vital for effective corrosion management.

In conclusion, ductile iron pipe corrosion resistance is critical in the water and wastewater infrastructure setting. While ductile iron pipe has natural corrosion resistance, external coatings and Cathodic Protection systems are essential to prevent external corrosion. Protective coatings, liners, and regular inspections can prevent internal corrosion. Proper maintenance is crucial in maximizing ductile iron pipe's performance and lifespan. Contact us for more information on ductile iron pipe corrosion and how we can help manage your assets.

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