×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Evaportation tank, Chem reactions?

Evaportation tank, Chem reactions?

Evaportation tank, Chem reactions?

(OP)
We are trying to evaporate our wastewater from a Pre-Paint Rinse Line, which is used mostly for galvanized sheet metal parts.  We have constructed our tank from Stainless Steel (316 SS).  We have put a Stainless Steel Fire Tube through the tank (it serpentines through the tank).  Everything functions properly and works extremely well for concentrating the Zinc into crystals.  Here is the problem: After running the tanks for a while (sometimes 3 months, sometimes up to 8 or 9 months) the tanks or the fire tube will “rot” through.  Examining the materials at the “rot” we can tell that the stainless parts are being broken down, sometimes rapidly.  There does seem to be a faster breakdown of the stainless parts in areas of concentrated heat.   I am looking for some thoughts or opinions on this.  Should we use different material for the equipment, should try forced circulation of the waste in the tank, perhaps a third factor besides Stainless, Heat and Zinc are the cause.   I am a Mechanical Engineer (not Chemical) and I apology for my choices in terminology if they seem crude.

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!


Resources