Selection of flange gaskets
Thread Content
This is a measurement point for the recovery of acetic acid through exhaust gas spraying in the PTA unit; the temperature is between 180 and 190 degrees, with a pressure of 4 to 5 kilograms. It is a tuning fork switch, 2 inches in size, with a 300-pound flange; the material used is 316L covered with a PFA plastic layer, and the device itself is made of titanium. The customer is using graphite gaskets made of titanium; it seems that tightening the gasket on this flange inadvertently damages the plastic layer on the flange. Acetic acid, in its mist form, penetrates through and corrodes the 316L material inside, resulting in instrument failures. What type of flange gasket would be suitable in such a situation? Ordinary PTFE suppliers may not be able to withstand such temperatures.
This is from another unit that hasn’t been put into operation yet; it was taken apart for inspection. The gaskets are firmly attached to it, and no one dares to remove them
After these two areas were separated, a strong smell of acetic acid filled the air, which was quite refreshing:(
You can try using PTFE gaskets
Customers are reluctant to use pure PTFE polytetrafluoroethylene as it cannot withstand such temperatures; after checking some information, it turns out that even when acetic acid is added at these temperatures, PTFE still cannot hold up