Selection of material for the circulating caustic solution pipeline in ion-exchange membrane caustic soda production
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This post was last edited by Benbenxuan on 2009-11-2 at 14:37. The material used for the circulating alkaline solution in our company’s electrolyzers (with a concentration of around 30%, and a temperature of 80–90) is PPH+FRP. Two years after driving, leaks at the drain connection began to occur. I read the relevant posts on the forum, such as: http://bbs.hcbbs.com/viewthread.php?tid=159958. This issue has also been discussed. Here, I would like to ask fellow users with similar experience to provide some information on the following: 1. What material is used for such pipelines in your company? Commonly such as PPH, 310S, and steel-lined PTFE ； 2. Where is the manufacturer of the material used? What is the service life? 3. If the material has been changed at some point, what are the problems that have arisen? How is it after the replacement? 4. What is the name of your company? (If it’s confidential, please let me know via text message; I just want to make the analysis report more convincing.) As the moderator of the Engineering Project Management Technical Exchange forum, I’m unable to rate your reply. I’ve created a related thread in the Engineering Project Management section, and you can also respond using the link below. Thank you. http://bbs.hcbbs.com/thread-552305-1-1.html
Our factory uses 310S stainless steel
It is better to use stainless steel 310S at present.
Our company once used PPH pipes from George Fischer, but these pipes deformed and started leaking after being in use for a short time; we then switched to 310S stainless steel pipes, which have performed well, so 310S stainless steel is indeed quite reliable.
When the temperature is above 80 degrees Celsius, low-carbon austenitic stainless steel should be used; 304SS is sufficient as it is the most cost-effective option. 316L can also be used, but 310S is more expensive and not necessary in this case.
Our company originally used 316L, but the cathode systems became contaminated; now we have switched to 310S, and the results are much better
Most use 316L; the cathode system for the forced-circulation tanks produced by Beihua Machinery is made of 316L. High-quality 304SS can also meet the requirements, and the material choice can be determined based on its cost-effectiveness.
I’m using 310S stainless steel
It’s better to choose 310s; don’t sacrifice the bigger picture for minor gains.
Is there no new material other than stainless steel?
Using a PVDF piping system will solve your problem. My QQ is 717835597