acetic acid at 80% 1

[cheaterbar]

I'm in a process application bind and received good help here.

Hoping someone would know if 316 S.S. is the right type of valve choice for acetic acid ( 80 % ) concentration, 70 PSI at 250 deg.F

Thanks for any help on this.

Cheater

 

[gr2vessels]

cheaterbar,
Do yourself a favour and check out the Outokumpu website, they are giving away their latest edition of the Corrosion Handbook, it worth its weight in gold. According to this corrosion bible, at 80% concentration above 106 deg C (BP), the corrosion will affect not only the 316 (rates 1 - 2 mm/year), but might also affect Titanium, SAF 2507, etc.., particularly in localised pitting attack.
Cheers,
gr2vessels

 

[JimCasey]

I see a lot of Zirconium going into Acetic acid service. But at your conditions you might want to consider a TFE-lined valve like a Durco T41 or a PFA lined valve such as an Atomac AKH2A

 

[texasvalve]

Depending on whether you need a ball or butterfly valve there are fluoropolymers that are lined with PTFE blends that hold up well and have better properties than PTFE or PFA. Look at valves with Dupont NXT or 3M TFM.