Timeline for Must these old pipes be replaced?
Current License: CC BY-SA 4.0
12 events
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| Nov 19, 2021 at 22:09 | comment | added | MonkeyZeus | I don't recall making any claims about strength. I'm not a metallurgist so I cannot confirm nor deny your thoughts but I'm going to take a wild guess and say that the galvanization process wasn't invented just for fun. | |
| Nov 19, 2021 at 22:01 | comment | added | JDługosz | I really don't think the zinc coating makes the pipe stronger! "The corrosion resistance of mild steel can be further strengthened through the addition of carbon." so the specific type of steel is chosen for natural corrosion resistance, rather than toughness or tensile strength or maliablity (whatever they meant by "stronger"). The galvanized pipe can start with a steel chosen for its mechanical properties. | |
| Nov 19, 2021 at 17:18 | comment | added | MonkeyZeus | @JDługosz In summary, 80 years is a respectable lifespan for metal pipe which transports water; entire houses can have shorter lifespans. If you had enough money to do all stainless steel then the plumbing would outlast several family generations. In fact, if the house were to be demolished then the metal would be saved and used in the next home. | |
| Nov 19, 2021 at 17:09 | comment | added | MonkeyZeus | @JDługosz The longevity of the zinc coating is affected by multiple factors such as the thickness of the coating, frequency of water turbulence, and water chemical composition. Yes, once the zinc coating is gone then the pipe is quite exposed and will rust accordingly. This website has some good information: supremepipe.com/blog/difference-black-iron-galvanized-pipes. Overall PEX is much more desirable due to material cost, ease-of-install, and estimated longevity which is on par with galvanized steel and copper. | |
| Nov 19, 2021 at 16:58 | comment | added | JDługosz | I understand that it takes 80 years to rust through. But I didn't get the idea that it doesn't rust for 75 years and then the coating fails and it rusts rather quickly. The impression I got is that the rust happens slowly and thins out the pipe over the entire life. How does the galvanization make the pipe last longer (and does it really)? | |
| Nov 19, 2021 at 16:53 | comment | added | MonkeyZeus | @JDługosz 80 years is unacceptable to you? Please define "very long" | |
| Nov 19, 2021 at 16:29 | comment | added | JDługosz | So the zinc coating doesn't last very long? If it rusts like that, clearly the galvanization did not cover the iron against the water. Also, how long is PEX supposed to last, and is there any indication that the figure is accurate? | |
| Nov 18, 2021 at 16:37 | history | edited | MonkeyZeus | CC BY-SA 4.0 |
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| Nov 18, 2021 at 15:26 | history | edited | FreeMan | CC BY-SA 4.0 |
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| Nov 18, 2021 at 15:03 | history | edited | MonkeyZeus | CC BY-SA 4.0 |
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| Nov 18, 2021 at 14:58 | history | edited | MonkeyZeus | CC BY-SA 4.0 |
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| Nov 18, 2021 at 14:51 | history | answered | MonkeyZeus | CC BY-SA 4.0 |