×
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

Restriction Orifice Thickness Sizing
2

Restriction Orifice Thickness Sizing

Restriction Orifice Thickness Sizing

2
(OP)
Sonic Flow and Restriction Orifice Thickness
Thickness of the restriction orifice plate needs careful consideration as the differential pressure across the orifice plate is generally higher as compared to measurement orifice, particularly for the sonic flow application where high differential pressure is desired to be maintained to achieve the sonic condition(Note 3).
Sonic flow through restriction orifice plate in quite common in chemical process plants as well as oil and gas industries. The design of the restriction orifice plate will be such that sonic flow is maintained(Note 4). Restriction orifice bore selection(Note 5) for sonic conditions are generally done on trial and error basis in process simulation software. Upstream pressure of the orifice plate is calculated in such a way that flow through the restriction orifice is sonic until the vessel pressure has reached 50% of its design pressure. When a gas flows from one point to other through an orifice, it is obvious that as the down pressure is reduced, the flow rate steadily increases until the velocity at the orifice reaches sonic velocity. Any further reduction of downstream pressure, the flow rate is unaffected and the excess pressure is dissipated in shock waves downstream of the orifice. It should be noted that square
root formula used for normal orifice flow measurement is not valid for sonic flow.


Thickness Calculation Formula
Thickness of any orifice plate, as defined in the R.W.Miller's handbook, depends on the following parameters l Line size
Differential Pressure
Yield Stress of Plate
ß Ratio

Can anyone finish this article?  It was cut off right at the most critical point.  

RE: Restriction Orifice Thickness Sizing

You might try emailing a couple of people on the contact list to see if you can buy the backissue or an electronic copy.  Sometimes major universities will have access to periodicals.
http://www.etinstrumentation.com/contactus.html

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