×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

High RhoV2 at relief valve discharge (not discharge piping)

High RhoV2 at relief valve discharge (not discharge piping)

High RhoV2 at relief valve discharge (not discharge piping)

(OP)
Hi,

I have a balanced relief valve to verify in flarenet.

The valve is 4P6. The downstream piping is 10" to give a rhov2 less than 150,000kg/m/s2 and mach no < 0.75 in the downstream tailpipe.

The expander is flange to flange with the relief valve, but has sonic velocity at the inlet (/relief valve nozzle) and rhov2 > 200,000.

Backpressure is ok.

There are no AIV issues.

Is this typically acceptable? All guidance talks about downstream *piping*, not so much the conditions at the valve discharge itself. If there are no weak fittings and just straight pipe between the valve discharge and expander, is there actually a mechanism for failure? Considering the force at any restriction is proportional to rhov2*d2, but there is no 'd2' term for the fluid momentum to act against.

RE: High RhoV2 at relief valve discharge (not discharge piping)

Amas,

Consider deleting this and re-posting in the "Safety Relief Valve Engineering" forum.

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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