What material should be used for pipes to transport acetic acid?
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Acetic acid is corrosive and flammable; should PP pipes be used or stainless steel pipes? Please advise
Of course, stainless steel pipes should be used! ! !
It is also necessary to determine at what temperature acetic acid is pure acetic acid The situation is different, so the materials used are also different. Generally, for pure acetic acid at temperatures below 80 degrees, 316L can be used
Acetic acid with a concentration of less than 50% and a temperature of below 100 degrees Celsius can be handled using PP pipes. For stainless steel pipes, Cr18 steel should be chosen, as it can withstand corrosion from acetic acid over a wide range of concentrations and temperatures
Thank you so much! The acetic acid I use is at around 30 degrees, but it is flammable; is the sealing quality of PP pipes guaranteed?
As long as the temperature is not high, non-metallic pipes such as PP pipes can be used. . . Molybdenum-dititanium stainless steel can be used for the metal tube. . . :lol
Our company uses stainless steel pipes, which have been in use for several years now and perform well
To sum it up, PPR pipes can also be used, but they tend to become brittle and crack easily in winter. Stainless steel isn’t as acid-resistant as people think; it’s only slightly better than carbon steel. If you don’t believe me, you can conduct a test. The best material for acid resistance is carbon steel lined with Teflon. I hope the original poster will consider this
Our company uses stainless steel pipes to transport around 10% acetic acid; these pipes can last for several years, but the joints and connections often leak
Regular stainless steel will do; acetic acid does not cause corrosion to stainless steel, so there is no need to use the expensive 316L
Polypropylene can also be used; the results are good
Inflatable 304 stainless steel valves can be used somewhat, but it’s better to use 316 stainless steel or plastic valves – those are my areas of expertise! QQ: 928976489
Use 316L when the temperature is high; 304 is sufficient at normal temperatures
Check the acetic acid concentration. It is believed that 316L can be used when the concentration is low, while titanium should be used for higher concentrations. .
CR18 stainless steel is the best choice.
Of course, stainless steel pipes are used. In winter, acetic acid freezes, so heat tracing is also necessary; PP pipes cannot withstand such temperatures.
316L is the most commonly used in practice.
The most reliable metal material is zirconium, but it is extremely expensive
I believe using PP pipes is sufficient, as it results in the lowest cost. Of course, its brittleness at low temperatures is relatively poor, but there are many types of PP available, and one can choose PP pipes with fibers added. Also, if heat tracing is required in winter, I’m not sure what temperature it can reach. PP has no problem with temperatures up to 100°C.