For the acid outlet pipe of a absorption tower, what material should be used for the pipe?
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:Loveliness: For the outlet pipe of the acid absorption tower, what material should be used for the pipe? Since the acid coming out of the absorption tower is high in temperature, high in concentration, and highly corrosive, what type of pipe material is suitable for use? What anti-corrosion measures should be taken as well? Please exchange your opinions!
In China, I’ve seen systems that use 304 stainless steel or 304 stainless steel pipes with anodic protection, as well as low-chromium cast iron pipes, among others； Imported ZECOR pipes, etc.
It is best to use 316L stainless steel pipes
The corrosion rate of ZeCor pipes in 96% H2SO4 at 70 degrees Celsius is less than 0.005 mm/year, making them a material with virtually zero corrosion. The maintenance costs are very low, so using ZeCor material is quite economical.
Zeron-100 is also a good material; we are using it in a project abroad right now.
Low-chromium cast iron pipes will do; their lifespan is over 10 years.
Anode protection applied to 304L or 316L stainless steel pipes can be used. The technology in this area is already very mature.
904L is readily available; alloy 20 is also used. Considering cost efficiency, low-chromium cast iron can be used.
:For handshakes, low-chromium cast iron pipes are indeed sufficient – they are cost-effective and practical; there’s no need to go for more complex solutions.
Our factory uses low-chromium cast iron
Low-chromium cast iron pipes are actually sufficient for use; if one feels concerned, adding anodic protection will ensure complete safety. Of course, this material has a drawback in that it has low toughness, so it should be used in areas that are not subject to stress.
Low-chromium cast iron pipes are actually sufficient for use; if one feels concerned, adding anodic protection will ensure complete safety. Of course, this material has a drawback in that it has low toughness, so it should be used in areas that are not subject to stress.
Our company uses K alloy for socket pipes, while 304 steel with anodic protection is used for acid pipelines
It is recommended to use 316L with anodic protection, as adopted by numerous domestic smelting plants