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

Petroleum refining engineering FAQ

Fluid Flow

What are the maximum recommended fluid velocities in pipes for normal applications? by TheProf
Posted: 2 Feb 03

Customary maximum fluid velocities in pipes are 15 ft/s for liquids and 150 ft/s for gases. Do not generally exceed these limits.
For single phase gas lines, I use a maximum of 60 ft/s so that in-plant noise does not become a problem. Try to avoid too small a velocity (use > 15 ft/s) so that liquid accumulation is avoided.
For liquid lines, use up to the maximum of 15 ft/s, if the pressure drop is not a problem, and apply a minimum of 3 ft/s to avoid possible solid or liquid accumulation in pipe bottoms.  
For lines such as cross-country pipelines the velocity you use would be an economic balance between acceptable pressure drops, flow rates desired etc.
For two phase flow, flow velocity must not exceed the erosional velocity as given by Ve = C/(sq root dm), where Ve is the erosional velocity ft/s, C is a constant and equal to 100 for continuous service, dm is the density of the gas & liquid mixture at operating conditions, and an equation too long for entering here.
For steam lines, use 175 ft/s for 50# to 150# steam, 130 ft/s for 150# to 400# steam, and 100 ft/s for 400# to 600# steam.

Back to Petroleum refining engineering FAQ Index
Back to Petroleum refining engineering Forum

My Archive


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