×
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

Nozzle on Head

Nozzle on Head

Nozzle on Head

(OP)
I have a nozzle at 56 degrees from the vessel CL. It's not radial, perpendicular or hill side. How do I model this nozzle?

RE: Nozzle on Head

(OP)
I know how to calculate nozzle reinforcement if I had to
do a hand calculation. The problem is, how do you input the data in the software?

RE: Nozzle on Head

This sounds like a "tilted" nozzle whose axis is at 56° from the vessel axis.

COMPRESS provides for tilted nozzles attached to cylindrical shells: Select the tilted nozzle option and specify the tilt angle of 56°.

However, such an option is not available for nozzles attached to heads. A radial nozzle on the head might have its centerline tilted at 56° to the vessel axis. But this is based on the nozzle axis lying along the geometric 'normal' vector to the head at that location. This implicitly fixes the location of the nozzle's distance from the vessel axis. A more general condition exists in that given the distance of the nozzle from the vessel axis then the nozzle axis might be at any generalized angle from the 'normal' vector (compare to 'tangent' vector) to the head at the intersection of the head surface and the nozzle axis.

The latter condition was rarely encountered in the "olden" days of pressure vessel design. Now, odd orientations seem to be relatively common as they are dreamed up by the process or piping engineers.

It is possible to model such a nozzle in COMPRESS by designing a nozzle whose inside diameter matches the largest chord opening of the tilted nozzle. The reinforcing area calculations should be reasonably accurate. Because openings in the head do not consider the "F" factor of Figure UG-37 this is not an issue. To check the requirements of UG-45 for minimum nozzle thickness a radial nozzle of the actual nozzle size should be modeled.

Of course, if the actual nozzle is something like the 2" tangential nozzles I saw once on a vessel then the results may not be accurate. These 2" nozzles resulted in something like a 2" wide by 20" long "slit" opening in the shell. This is a condition not addressed by the elementary rules of the ASME Code.

  Tom Barsh
  Codeware Technical Support

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