What Pipe Linings Are Best for Sewer Applications?

Is Cement-Lined Ductile Iron Pipe suitable for Sewer Applications?

A question that we receive in the field all the time is: “Can we use cement-lined ductile iron pipe for our sewer upgrades?”  

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Yes, but only if you have a pH level from 4.5 to 12.

If your pH level is less than 4.5, then your line is septic and needs to be specially lined. Likewise, if you have a pH level that is greater than 12, then your line is alkaline.

Pro Tip: Alkaline is the opposite of septic but still damaging and requires a special coating inside the pipe line.  

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Some of the most damaging and fastest cement-lined ductile iron failures we’ve seen have occurred at sewer laterals from restaurants and bars as their fluid streams have a high concentration of citric acids from juices and liquors drained down sinks on a daily basis.  

It doesn’t matter if you upgrade the pipe wall thickness from a pressure class 350 to a thickness class 52, that is only going to buy you a few more years in service, but not cease corrosion potentials.

If you can’t guarantee that your pH levels can stay in that 4.5 to 12 range, then you need to protect your iron pipe with a specialty interior lining designed to handle the toughest septic issues. That is where you have choices as owners and engineers as to what lining you want to use.