What material should be used for the valves at the top of the formic acid tower?
Thread Content
Manual or pneumatic gate valves should be installed in the formic acid (HCOOH) tower: 1 unit for Class 150, DN400; 3 units for Class 150, DN80. Composition: formic acid: 3.5%, water: 90.3%, 00: 1.8%, CO: 4.4%. Temperature: 110°C, atmospheric pressure. May I ask: for such operating conditions, what materials should be used for the valve body, valve disc, valve seat, and valve stem?
Why must a gate valve be used? Does the valve have to be installed at the top of the tower? Can’t it be connected by pipes to a lower level or to some other platform? A ball valve can also be used; for acidic media, a fluorinated lining might be an option as well
Well, it can also be changed to the platform. I was thinking a 400 diameter; isn’t a 400 ball valve a bit too large?
My colleagues say that using titanium for the internal components is too costly. Is it possible to use fluoropolymer lining for formic acid? If fluoropolymer lining is an option, is a fluoropolymer-lined butterfly valve the most economical choice?
Lined with PFA; most products on the market use FEP (F46). F46 cannot withstand temperatures of 110 degrees, whereas PFA retains 85% of its strength at 110°C