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

Copper Strip corrosion in Propane Product in C3 splitter column bottom

Copper Strip corrosion in Propane Product in C3 splitter column bottom

Copper Strip corrosion in Propane Product in C3 splitter column bottom

HellO experts !!

Propane is recovered from Unsaturated LPG at Propylene Recovery Unit (PRU) - Propylene tower (C3= splitter) bottom.
We process FCC & Coker Unsat LPG in PRU.

We are facing problem of Copper strip corrosion test failure at Propane eventhough LPG feed to PRU is Okay (Cu corrosion test is as per specification of 1B).

Recently, Propane Product is failed to Cu strip corrosion when Upstream column (DeC2- Deethaniser column) overhead cooling water exchanger was taken in to service after exchanger tube cleaning/repair in-situ.

We have the frequent experience of heavy deposits in the shell side of the Deethaniser  overhead exchangers (the analysis of the deposits and deethaniser reciever boot water ionic species analysis is attached).

Is there any possibility of relationship between Cu strip corrosion test failure with the deposits at this exchanger as well as inherent sulfur species coming with LPG feed

Request to throw some lights on Chemistry aspects ?  



Thanks in advance.


RE: Copper Strip corrosion in Propane Product in C3 splitter column bottom

A sketch would be helpful to see the process flow. But a first guess would be it sounds like you CW exchanger is leaking water into the process.

RE: Copper Strip corrosion in Propane Product in C3 splitter column bottom

the unsat LPG is the feed from LPG merox unit. There are 3 columns in this PRU unit.first feed hits in to c3-c4 splitter column,then its overhead goes to deethaniser column and then finally c3 splitter column which splits propylene as overhead and propane as bottom. This problem is pertaining to bottom propane stream.
Cooling water tube side pressure is 4 kg cm2g and shell side is 21 kg cm2g. So, i think it may not be chance.  

RE: Copper Strip corrosion in Propane Product in C3 splitter column bottom

We treat with Caustic for RSH  and Amine for H2S both.

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