×
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

flow through a orifice

flow through a orifice

flow through a orifice

(OP)
Guys,

Hope you can help me out with a calculation.

I have a system with unstabilized crude. If there were a accidental release of hydrocarbons from this system, from a hole (for example 1 cm diameter), how can the flow through this hole be calculated?

I know how to calculate the flow if this was a gas or liquid service, using standard orifice sizing calcs. With a unstabilized crude service, I am not sure how to calculate due to flashing.

The system can be assumed at such pressure that the flow would be sonic (for example 40 barg system pressure, and release to atmospheric pressure)


Thanks!
 

RE: flow through a orifice

it doesn't appear an easy task, cause the difficulty to determine two-phase flow regime, one could assume the two-phase mixture as homogeneous and apply a homogeneous equilibrium (HEM) or the homogeneous nonequilibrium (HNE) but in several cases you could obtain unrealistic results.
For rupture disks I have created a simple Excel page based on a paper of Fauske, Sizing of Rupture disks for two-phase flow, the flow was determined as W=Kd*A*G where Kd is the discharge coefficient, A the area and G the two-phase mass flux, the paper gives simple correlations to calculate G in different cases. A more complex approach is the Omega method, in general for this matter I would recommend the papers of Fauske and Leung.

RE: flow through a orifice

search restrictive orifice
 or
Thread=189979

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