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

fluid velocities inside pipe before erosion occurs?

fluid velocities inside pipe before erosion occurs?

(OP)
Hi folks,

If I were to have a 2-7/8" carbon steel pipe with a 2.441" ID (cross sectional area of 1.812"), what is the maximum velocity I could have flowing through it?  

As it stands, if I flow 7000 bpd through this pipe, the velocity would be 13.99 ft/sec.

Any help would be appreciated.

Thanks

RE: fluid velocities inside pipe before erosion occurs?

Just a little hint here - before you ask questions, check out the other simialr questions via the search bbox at the top.

for example see http://www.eng-tips.com/viewthread.cfm?qid=348061

your veleocity isn't particularly high unless you've got hard particles in and you'ev got elbows or you're going into a tee at right angles.

Max velocity is an art not a science.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

RE: fluid velocities inside pipe before erosion occurs?

I briefly looked at the linked post and it does not contain all of the information you need. In carbon steel tubing (I assume that is the pipe you are referencing), the rate of erosion is increased by several factors. The number of chlorides (hard particles) magnifies the rate drastically. You would need a water analysis to quantify this. Also, CO2 and H2S corrosion (pressure and temperature dependent) can speed up the rate of erosion. Do you have any other particles being produced, such as sand? Are any chemicals passed through the pipe that could alter the effect of any of the other contributing factors? Acid jobs, production chemicals? Your fluid composition is also needed to calculate your maximum velocity. Increasing fluid density lowers maximum allowed velocity quite drastically, and is only compounded by factors of CO2 and particles.

Depending on the compositional grade of the tubing, the maximum design velocities will differ. You could pay for a higher grade of tubing to delay or prevent added erosion. Another consideration is once you have erosion, your friction factor is changed and alters your critical velocity to flow or lift.

Rachel

RE: fluid velocities inside pipe before erosion occurs?

API RP 14E 1991 has this equation for overall-mixture erosional velocity:

Ve = C / √ pmixt

Ve = erosional velocity
C = empirical constant, 100 for continuous flow, 125 for intermittent service
pmixt = gas/liquid mixture density, lbm/ft3

RE: fluid velocities inside pipe before erosion occurs?

(OP)
thanks all for your help, much appreciated

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