How long can a rubber asbestos board wrapped with PTFE tape last?
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During driving, a small amount of acid seeped from the cast pipe joints in the dry absorption section. We wrapped two or three layers of polytetrafluoroethylene tape (capable of withstanding +250°C) around the rubber-asbestos sheet, and this solution worked, but it’s not clear how long it will remain effective
Under normal circumstances, it can last one to two years.
Haha, it’s better not to use it, otherwise it will be a pain in the future!
I estimate it will last at most 2-3 months.
Our company uses acid-resistant rubber as padding; in the event of acid leakage, a mold is created during shutdown, and acid-resistant grouting material is poured in, and once it has set, operations can resume.
Did the person upstairs say to use KPI acid-resistant mortar? Once that stuff sets, it becomes very hard, which makes it difficult to replace the cast pipe.
It can last for over a year; PTFE gaskets are the best choice – they may be more expensive, but they’re reliable. Of course, the PTFE gasket is too hard, so maintenance workers don’t like to use it; if it’s not installed properly, leaks will occur
As a reference, expanded PTFE gaskets can be used; with a compression rate of 33%, they do not damage the pipes. Their rebound rate is 23%, which allows them to maintain an effective sealing preload. The price of such gaskets differs significantly from that of ordinary high-quality PTFE gaskets – they are definitely more expensive than inferior PTFE gaskets. Most PTFE gaskets available on the market these days are made from recycled material, which makes them cheaper, haha