×
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

2 Phase Flow & Line Blowing Solvent with Nitrogen

2 Phase Flow & Line Blowing Solvent with Nitrogen

2 Phase Flow & Line Blowing Solvent with Nitrogen

(OP)
I am trying to find a basis for calculating the required Nitrogen pressure and velocity for blowing a 2inch solvent pipeline.  The aim is to empty the solvent line as much as possible following a centrifugal pump transfer.  The pipe run is approximately 50meter in length that has both horizontal and vertical runs from the Nitrogen tee to the receiving vessel. The elevation of the Nitrogen tee is about 10metres below the receiving vessel and is located at the suction of the pump. The available Nitrogen pressure is 4barg from a 1inch line.  Is there a straightforward basis for calculating the required Nitrogen pressure and velocity to blow forward the solvent into the receiving vessel with minimal solvent remaining in the line??

RE: 2 Phase Flow & Line Blowing Solvent with Nitrogen

To get the line really clean really fast, you need to rig a 10 m vertical leg at the pump suction and introduce the N2 at the top of it.

Good luck figuring out the timing, but a blast of gas will push the solvent forward as a slug.  Vent the line, and the solvent comes back.  Get the solvent 'rocking' back and forth with alternating blasts of gas and venting, and when you've got it in resonance, _then make the last burst of gas really long and blow out the last of the solvent.

The technique may or may not scale up well.  It works great on a 3/8" refrigerant line running the length of a van and back.








Mike Halloran
NOT speaking for
DeAngelo Marine Exhaust Inc.
Ft. Lauderdale, FL, USA

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