Sanitary Corrosion Failures in Cast Iron Pipe

For most of us older engineers, we were taught that cast iron piping was the preferred material for drainage systems. Durability, longevity, use in return air plenums and sound dampening were often used in describing the benefits. I can remember being told that it would last over a hundred years, but after looking at a source for this claim, I discovered that was for service water piping. The reality is sanitary waste is more aggressive than service water with respect to corrosion. While some might expect the first signs of failure to be dripping…

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