×
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

Stainless Steel Nozzle on Carbon Steel Tank

Stainless Steel Nozzle on Carbon Steel Tank

Stainless Steel Nozzle on Carbon Steel Tank

(OP)
I am specifying a tank for 93% sulfuric acid following NACE SP0294-2006. The document recommends using carbon steel for the tank but appears to be recommending stainless steel for the nozzles. Is this normal? It seems like there would be a corrosion problem at interface of the stainless and carbon. Also, are there any special requirements on welding the dissimilar metals?
Thank you in advance.

RE: Stainless Steel Nozzle on Carbon Steel Tank

Requirements for welding dissimilar metals are covered in Annex SC of API 650. SC.3.4.2 allows nozzles to be of different material than that of the shell to which they are attached at the request of the Purchaser.

It is common for the nozzles in acid tanks to be of different material than that of the shell. I have encountered it both in API 650 tanks and in ASME pressure vessels. The galvanic effects are small in comparison to the effect of removing the passive layer formed in unlined carbon steel tanks in 93% H2SO4 tanks.

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