Wetted parts for check valve 80%-98% nitric acid application: alloy 20.
Wetted parts for check valve 80%-98% nitric acid application: alloy 20.
(OP)
Our customer is looking to substitute the wetted parts of some swing check valves, currently in 316L. For obvious reasons, the 80%-98% nitric acid solution at 20ºC is making the 316L is melt away like butter on toasted bread.
We're looking to substitute these parts with UNS N08020 (Alloy 20); specifically the disc nut, disc washer and hinge pin. Body material is SS310 (see attached GA drawing). Would Alloy 20 be suitable for these particular parts?
We're looking to substitute these parts with UNS N08020 (Alloy 20); specifically the disc nut, disc washer and hinge pin. Body material is SS310 (see attached GA drawing). Would Alloy 20 be suitable for these particular parts?
I work with valves in exotic alloys at The Alloy Valve Stockist. This is our blog, and this is me on Twitter and LinkedIn. Let's connect!





RE: Wetted parts for check valve 80%-98% nitric acid application: alloy 20.
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Wetted parts for check valve 80%-98% nitric acid application: alloy 20.
Can you send me a screen shot of that particular table. Client confirms 98% concentration at all times, so the 80-98% range isn't valid.
I work with valves in exotic alloys at The Alloy Valve Stockist. This is our blog, and this is me on Twitter and LinkedIn. Let's connect!