Inconel And Chlorine Dioxide

[TBP]

I'm only on the fringe of this situation, and it isn't an area I normally get involved in. A vendor has recommended an inconel X-750 spring in a metering pump check valve for chlorine dioxide service. This is to be installed in a location with very awkward access, so we don't want to be buying something that's going to be a maintenance headache. Any problems with inconel in this service?

 

[swall]

What is the operating temperature? Will any moisture be present?

 

[TBP]

The operating temp is amibient. I'm not sure about moisture. Is there a range to be avoided?

 

[TBP]

I was given incorrect info - the operating temp range is between 205*F and 275*F.

 

[Eltron]

Inconel 600 is not recommended for use in chlorine dioxide service(0.5% at 36°F, & 8-12% at 150°F). If I were you I'd avoid using it, so you don't have to fight the maintenance headache. Hope that helps.

 

[TBP]

Is there a material that would be more suitable? Thanks for your help.

 

[Eltron]

It's your temperature range that I'm worried about. Aluminum is good to 70°F, but anything over that would be a guess.

 

[TVP]

Titanium as a base material is recommended in chlorine-containing environments (including chlorine dioxide) due to the presence of a stable, passive oxide film. The proprietary alloy TIMETAL 15-3 from TIMET is available in high strength strip. If the spring requires bar/wire, then Ti-3-8-6-4 (also called Beta-C) is the most common alloy for springs. TIMET and Dynamet, part of Carpenter Technology, are leading suppliers of Ti materials and Renton Coil Spring is a leader vendor of titanium springs. Use the following links for more information:

http://www.timet.com/Index2_content.html

http://www.cartech.com/dynamet/

http://www.coilspring.com/aerospace/company/index.html