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!

*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.

Jobs

316L SS - Materials science: Pickle and Passivated versus bright annealing

316L SS - Materials science: Pickle and Passivated versus bright annealing

(OP)
I am a PE working on a construction project that involves the transmission of waste glycerol (from biodiesel production) through a variety of pressurized force mains (24-hours per day, 7-days per week). Our specifications call for all 316L stainless steel piping to be pickled and passivated. Our contractor has proposed one manufacturer that can furnish all the piping for the project, however the manufacturer uses both the pickle and passivation process as well as the bright annealing process to prepare the piping. The manufacturer claims that they cannot furnish all of the piping with only the pickled and passivated treatment. I am trying to make a fact based determination of whether or nor the bright annealing process is technically equivalent to the pickle and passivation process. The purpose of this thread is to request information/insights/feedback on the subject of these two treatments.

I am specifically thinking that a technical substantiation would include the following:
1. What is the intent of the pickle and passivation process? Is the intent of the bright annealing process the same or somewhat different?
2. How is the pickle and passivation process’s effectiveness is measured? What test is available? What data can prove it?
3. How the bright annealing process’s effectiveness is measured. What test is available? What data can prove it?
4. Relative qualitative cost difference (if any)

Thank you in advance for any feedback that you may be able to provide!

RE: 316L SS - Materials science: Pickle and Passivated versus bright annealing

I'd be interested in a response to this.

I'm a MechE. From what I've heard/seen of pressure vessels, the welds are coated in a citric acid paste for the pickling. Not sure if that is done on the seamed pipe, or if ALL of the pipe surface gets hit with that.

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


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