×
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!
  • Students Click Here

*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

Jobs

forcing gas flow through the branch line

forcing gas flow through the branch line

forcing gas flow through the branch line

(OP)
Hello , I'm working on a gas plant and there's a place where there's a main gas header and then there's a branch line that takes off from the main header which is the same size as the main header but only 30% flow is required to go through the branch line and 70% through the main header. Would putting an orifice in the main line upstream of the branch can force 30% through branch . Please let me know the engineering behind it and the orifice sizing .

RE: forcing gas flow through the branch line

smile i bet you get lots of replies to this request for "free engineering"

RE: forcing gas flow through the branch line

Well it might, but the engineering is based around the pressure at each end of your main and branch line.

If the end point pressure is the same for both lines and the distances the same then you would have expected the orifice to be on the branch line.

Your question makes no sense without data (size, pressure, flow etc) and drawings / sketches of the system.

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

RE: forcing gas flow through the branch line

It sounds the request is looking for a quick and simple solution for the operation. If the piping with orifice restriction could be effective in the flow design, there is no need for various instrument control devices.

If the only orifices available, verify how many flow conditions you may excepted in the system, in terms of flow, P&T, etc., and calculate the orifice size as needed for each case. And then, you may use the proper orifice under the specific flow condition as required.

RE: forcing gas flow through the branch line

You've got to tell us a lot more before we can provide the right solution. At the moment, would suggest you should speak to your lead process engineer to sort this out for you.

RE: forcing gas flow through the branch line

Also putting an orifice plate "upstream" of the branch will simply reduce flow in the main line.

This is where a diagram helps a lot.

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

RE: forcing gas flow through the branch line

Although putting an orifice sounds like the simplest solution, but checking validity of such solution depends on many factors including expected variability of the gas flow, distances between orifices and destination equipment, nature and composition of the gas flow, range of flowrate, to name a few, how accurate this 30/70% control must be, ...

Please share with us what did you come up with.

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