Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Engineering against multiple environments

Engineering against multiple environments

Engineering against multiple environments

This is a more general question since process info is variable. We utilize a spray nozzle of c276 with a cast CW2M low pluggage spray nozzle to quench a so2+n2 (0-3% o2) from 2300 F to 225 F). The quenchant is sulfurous water from a downstream unit laden with chlorides with a pH of 4-6 at 124 F.

At a very primitive level what materials are evaluated when HT corrosion, dew point corrosion, Chloride and sulfide stress cracking and pitting, weak sulphuric acid pitting, and HAZ dealloying are in play?

This question is probably silly but our site doesn't have SME experts and the OEM, corrosion lab, existing literature, and previous trials have all turned up dead ends.

RE: Engineering against multiple environments

You always start with CS.
Then you might want to add a lining / cladding / weld overlay of SS 316.
You need to know the velocity of the fluids that are involved, also if erosion is a dominant factor.

Kolkata, India

RE: Engineering against multiple environments

In places with high flow (valves and nozzles) go with very high alloys.

If you have any Cl present at that pH and temp there is no place for 300SS anywhere in the system.
The exception would be alloys like 310 in the hot end.
You need a reference for HT corrosion, with sulfidation what I would worry about first.
Start with the ASM publication by G. Lai.
And once you are below 300F I would worry about acid condensation.
If it were just S and N I wouldn't worry much, but with lots of Cl this could be severe.
For the intermediate temps CS (watching out for SSC) is a decent option.
With the stuff in your gas a lining may be needed.
For the lower temp end coatings (paints) may work very well.
For hotter areas it gets more complex.
Start by dividing the system into zones based on temp, flow conditions, and such.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: Engineering against multiple environments

Already use a fiberglass lining alongside high temperature paint for the shell. Going to try a cementation coating for the nozzle itself just concerned that I'm overrating the nozzle external temperature and the cementation coating will just solubilize.

I'm pretty well versed in ASM. Unfortunately no one ever writes about this hell process.

Appreciate the comment!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close