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

Max velocity slurry residue oil

Max velocity slurry residue oil

Max velocity slurry residue oil

can anyone tell me from personal experience (or maybe a rule of thumb), what the maximum allowable velocity in a pipeline for slurry residue oil (with approx. 2% catalyst) from an fcc plant is?
Thank you!

RE: Max velocity slurry residue oil

What sort of viscosity is this stuff?

What temperature?

"Slurry residue oik" is a little vague but sounds not very nice.

Velocity is dependant on length of pipeline.

For this I think you're looking at 1.5 to 2m/sec for long lines and maybe 3 for shorter lines.

Your issue may be what is the min Velocity...

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Max velocity slurry residue oil

As usual, I agree with LittleInch ..

Slurry transport piping design and operation is a little tricky.... Usually, what the engineering challenge involves is finding the best velocity required to efficiently transport solids. The minimum transport velocity is usually important.

This min velocity depends on the percentage solids, density, particle size and several other criteria.

Pipe routing is also very important. There are entire books written about slurry piping design and the study of Rheology

Maximum velocity ??... I would guess that you are looking at erosion/corrosion issues ...

Is the transported material hard ground garnet or talcum powder ?

Sr. Process Engineer

RE: Max velocity slurry residue oil

Thank you for the reply. The temperature is around 200 degrees and the viscosity around 0,8 cP. Indeed, I am concerned about erosion. I think it‘s more like talcum powder.
Thank you!

RE: Max velocity slurry residue oil

This might help a little.... If only to outline the issues that should be important to slurry piping design.


It would not be unusual for a system to be fully constructed and then repeatedly changed to "get it to work"

In my opinion, Slurry Pipeline design is more of an art than a science .... and that should be remembered.

Questions usually come up when the maintenance people have to re-route the piping and the system "doesn't work" anymore.

See if you can get your cheap ass boss to help a newbie, spring for a book and begin reading ...



Sr. Process Engineer

RE: Max velocity slurry residue oil

0.8 cP?? That's thinner than water so slurry residue doesn't sound right.

If your concern is erosion then keep it to about 2m/sec max and make the elbows and tees sch 160...

2 m/sec should be enough to keep your talcum powder in suspension.

But MJC is totally correct - slurry transport is a world of its own and very difficult to really design before you start operating it.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Max velocity slurry residue oil

Thank you for the help and the links.

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