Carbon steel and salt water
Carbon steel and salt water
(OP)
Hi there,
Can CS be used in vessel/pipes for water service (industrial) with +100,000 TDS salt water solution (mixed salt)? T around 50 C. Any code mandate?
Thank you
Can CS be used in vessel/pipes for water service (industrial) with +100,000 TDS salt water solution (mixed salt)? T around 50 C. Any code mandate?
Thank you





RE: Carbon steel and salt water
You could coat it, or use cathodic protection, in reality most applications do both.
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P.E. Metallurgy, Plymouth Tube
RE: Carbon steel and salt water
Idea is to use C.steel for the pipes and the vessel carrying the salt water. The system is under deep vacuum, although the water may contain air already.
RE: Carbon steel and salt water
Titanium resists corrosion by seawater to temperatures as high as 500°F (260°C), even under high velocity conditions or in polluted water
Regards,
Zachari Alamsyah
RE: Carbon steel and salt water
If the steel is thick enough, there are no galvanic joints in the system whatsoever and the solution doesn't mind being contaminated with the corrosion products (ie. Fe+2/Fe+3 in solution), then it might be OK. But if there is reintroduction of oxygen in the form of non-deoxygenated water or other feeds, it will not last long.
RE: Carbon steel and salt water
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P.E. Metallurgy, Plymouth Tube
RE: Carbon steel and salt water
RE: Carbon steel and salt water
The key issue with C Stl and salt water is oxygen. If you have even quite low quantities of it, especially at 50C, and your carbon steel vessel and pipes won't last more than few months.
Actively de-aerate it using vacuum towers and oxygen scavenger and then you can use C Stl, the trick then being to make sure that the oxygen levels don't climb over time / in reality.
It's not clear what purpose you're using this for, is it a static volume or constant new liquid and what is the oxygen concentration in the fluid?? Only then can you say with any certainity whether C stl, without any coating is good for this service or not.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Carbon steel and salt water
CS in Salt Water without oxygen with any concentration of Cl slightly corrosion but fine. CS will be corroded in aerated water (High Oxygen) as much as the concentration of Cl is higher the severe is corrosion. Salt water with oxygen in closed loop is Okay since the oxygen will be consumed by oxidizing CS quickly and after that Cl has no effect on CS and will be safe and vise versa.
Temperature 50 C is high and can accelerate corrosion in aerated salt water. I can say CS depend on thickness but more than 6 months. Except proper inhibitor used or Cathodic Protection system.