What are the advantages and disadvantages of the pipeline materials used in chlor-alkali plants? ? ? And the applicable situations for gaskets!
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In the chlor-alkali chemical industry, the main materials for pipes include titanium steel, PVC, CPVC, UPVC, and fiberglass; the primary gaskets used are PTFE gaskets, three-layer gaskets, metal gaskets, and Gore gaskets. . . May I ask, in what situations were pipe materials used in the past? ? ? And in what situations are gaskets used? ? ? The gaskets and pipe materials listed above are not comprehensive; I hope everyone will kindly offer their advice! ! !
Pipes are also available in rubber-lined and fluorine-lined versions, which are also widely used.
Glass fiber pipes aren’t very good; corrosion and leaks can be quite troublesome
PVC, UPVC, and CPVC are all resistant to corrosion by acids, alkalis, salts, and other substances. In terms of price, PVC is the cheapest, UPVC has a price that lies between the two, while CPVC is the most expensive； PVC is a general-purpose plastic that is used most widely, but it cannot withstand high temperatures; above 80°C, it decomposes to release HCL. UPVC is PVC to which plasticizers have been added, and it has greater hardness than regular PVC. CPVC, or chlorinated polyethylene, boasts the best hardness, strength, and heat resistance, and can be used as a substitute for steel; it is a type of advanced engineering plastic. Carbon steel, an iron-carbon alloy with a carbon content of less than 2.17%, is also widely used. It has greater hardness than plastics, but it does not resist corrosive substances. Tetrafluoroethylene gaskets, EPDM gaskets, and Gore gaskets (are these expanded tetrafluoroethylene gaskets produced by the Gore company?): all three types of gaskets possess properties such as corrosion resistance, aging resistance, and high strength.
For saline water, alkalis, chlorine gas, and brackish water, we use low-calcium-magnesium EPDM gaskets; for the pipes handling saline water, steel-lined low-calcium-magnesium EPDM is used, while titanium is employed for the pipes dealing with brackish water. Titanium is also used for chlorine gas pipes, PVC is used for pipes carrying mild chlorine gas, and 310S is used for the pipes handling alkalis
PVC for low-chlorine gas pipelines – which section of the pipeline does that refer to?
What is absorbed by the dilute chlorine is mainly the residual chlorine gas in the electrolyzer that is removed when the system is shut down
It should be made of fiberglass; otherwise, pure PVC does not have sufficient strength.
Chemical PVC pipes are used, which provide sufficient strength
1. Metals: Steel grade 20, QR235, TA2, SUS304, SUS316, 16MN2. Non-metals: PP, PO, PVC, CPVC, UPVC, PVC+FRP. 3. Steel linings: PP lining, low-calcium magnesium lining, PTFE lining, PO4 lining. Gaskets: EPDM rubber, neoprene, nitrile, modified tetrafluoroethylene, graphite, metal-wound