H
halfway
Guest
"How does a tank fail in fatigue? " Did I say that? No, I said the stress is what damages the passivation. A well known documented issue in any book. Then the lack of oxygen does not allow the passivation to reform. Then the normal corrosion processes for steel destroys the site.
As for "fatigue failure" of stainless tanks then the boat industry has many examples of fuel tanks and water tanks that fail. But they are over much longer periods. The smallest I encountered was a badly made tank that lasted 3 years.
In a sewage system we are talking months.
The normal corrosion of steel using H2S in sewers is what the last company I helped finance made their money in! You are saying they are fraudsters?
Just a simple quote from a quick google:
"The generation of hydrogen sulfide in sewer system due to microbial activities is a major problem worldwide. The sulfide produced may be released in gaseous form, leading to corrosion of concrete and steel structures in the sewer or associated systems. The corrosion is caused by a combination of complex chemical and biological processes. The cost of remediation or replacement of corroded sewer systems is very high for large systems, in the order of several hundreds to several thousands $ per m depending on pipe diameter and depth."
The normal documented CL corrosion of iron is also a well known documented method to destroy Iron. It is also the cause of some nasty cracked engine occurrences when old engines are sea water cooled. Due to the corrosion products expansion when oxygen is introduced during a refit.
As I said, the only solution to stainless in holding tanks is to cover the metal completely with a thick layer of material.
As for "fatigue failure" of stainless tanks then the boat industry has many examples of fuel tanks and water tanks that fail. But they are over much longer periods. The smallest I encountered was a badly made tank that lasted 3 years.
In a sewage system we are talking months.
The normal corrosion of steel using H2S in sewers is what the last company I helped finance made their money in! You are saying they are fraudsters?
Just a simple quote from a quick google:
"The generation of hydrogen sulfide in sewer system due to microbial activities is a major problem worldwide. The sulfide produced may be released in gaseous form, leading to corrosion of concrete and steel structures in the sewer or associated systems. The corrosion is caused by a combination of complex chemical and biological processes. The cost of remediation or replacement of corroded sewer systems is very high for large systems, in the order of several hundreds to several thousands $ per m depending on pipe diameter and depth."
The normal documented CL corrosion of iron is also a well known documented method to destroy Iron. It is also the cause of some nasty cracked engine occurrences when old engines are sea water cooled. Due to the corrosion products expansion when oxygen is introduced during a refit.
As I said, the only solution to stainless in holding tanks is to cover the metal completely with a thick layer of material.
