Experts, what material should be used for acetic acid pipelines to prevent corrosion?
Thread Content
The company has installed a new set of equipment that requires acetic acid. Could you please advise on how to provide heat retention for acetic acid in winter, and what material should be used for the acetic acid pipelines to ensure corrosion resistance? When using 316L for experiments over a long period of time, black spots appear on its surface.
This post was last edited by qhyhxjl on 2017-9-11 at 13:05. If the temperature is >150, titanium material TA2 can be used； Below 150 degrees Celsius, duplex stainless steel 2205 can be used ； PE pipes can be transported at room temperature. It’s sufficient for the heat tracing to maintain a temperature of >17 degrees Celsius; hot water or steam can be used, while PE pipes can only be used with hot water
The answer is comprehensive and correct; thumbs up.
Glacial acetic acid or acetic acid solution? It seems that dilute acetic acid requires very specific material properties at higher temperatures (the exact conditions need to be confirmed); materials such as stainless steel and titanium are not suitable. . . . . . .
316L for transport at room temperature; remember to conduct a intergranular corrosion test when purchasing it.
For heat tracing, you can refer to http://bbs.hcbbs.com/thread-1401962-1-1.html. As for the materials used for pipes and valves, we have used 316L and zirconium in projects done for customers in the past.
For acetic acid pipelines, 316L corrodes relatively quickly; nickel-based C276 performs better. If it is used for producing acetic acid, it is best to use Zr702 alloy; it will not corrode at all. However, its price is very high, and high requirements are placed on gas protection during welding.
It seems that choosing the right material for acetic acid is quite complex; let’s see how experts approach this issue, as it involves more than just temperature and concentration.
PTFE-lined pipes at 180°C or below
I asked; it’s from that book. Thank you