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

Deplugging of bend pipes in bitumen column

Deplugging of bend pipes in bitumen column

Deplugging of bend pipes in bitumen column

We have a Biturox plant in refinery producing bitumen of different grades.
At the top of column , we have a bend pipe (8" dia) of length 1080 mm and 660 mm vertical for collecting offgases. It gets choked frequently. Hard coke gets deposited in the pipe section. After removing pipe flange, we can only able to deplug the horizontal portion of 1080mm length. We are not able to deplug the vertical portion with pipe inside the reactor.
Any body , has idea of how to deplug the bend pipes ?
please let me know.

RE: Deplugging of bend pipes in bitumen column

I have had cases where I used a small explosive charge to unplug or remove buildup on the sides. This, however, is generally after all other options are exulted.

A few options:

Try a high pressure spray of a hot middle distillate to try to cut.

Contact a pipe freezing company, by lowering the temperature of the coke to LN2 or LCO2 may cause the coke to crack , i.e. facilitating removal.

Apply several powerful ultrasonic trandusers to the outside of the pipe , the eneregy from the transducer may remove the coke build up.  Contact Crest Ultrasonic, at http:/www.crest-ultrasonic.com/home.html see if they can help.

My concern is how to prevent this from happening again?
I would check the size of the holes in the oxygen spargers, you want the reaction with the vacuum resid to occur in the reactor portion not at the offgass pipe outlet.  

Is the offgass pipe too small? or bend too tight? both cases generaly lead to plugged piping.

Is the volume of oxygen injected into the reactor too great causing a carry over?

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