×
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

Skirt on Cone of vertical vessel
3

Skirt on Cone of vertical vessel

Skirt on Cone of vertical vessel

(OP)
I have a cone bottom vessel with a skirt.  How is the best way to calculate the stresses in the cone to see if the thickness is sufficient due to the attachment of the skirt.  Any help will be appreciated.  I have never put a skirt on a conical head.  Thanks in advance.

RE: Skirt on Cone of vertical vessel

I'm sure you will put a transition knuckle at the shell to cone joint; hence, by using a knuckle, the analysis would be exactly the same as that for a hemi-head.

RE: Skirt on Cone of vertical vessel

(OP)
Sorry should have clarified that point this is a small vessel 96" ID.  There is no knuckle in the cone.  It is a straight cone section approximately 80" long.  Cone is 96"ID to 5.75" ID.   

RE: Skirt on Cone of vertical vessel

I'm afraid that you're stuck with a design-by-analysis.

RE: Skirt on Cone of vertical vessel

I see.  Do you really need a skirt? Find out if that is really needed or it is just because the process engineer put that on the datasheet for the heck of it.  Legs or even lugs might be better solution.  But, if you really must have a skirt, for cone bottom vessels I have specified that the cone be welded directly to the inside of the bottom shell course with full pen weld, with about 50 to 75mm of the lower shell course protruding beyond the cone to shell joint.  This stub is for later full pen butt weld of the shirt to the shell.  Also this way, I get access for MT of the weld at the crotch and you can even UT the cone to shell joint from the inside.  I'm sure you know that you will need compression ring near the junction.  with this solution you don't need to do your fancy analysis.  Good luck.

RE: Skirt on Cone of vertical vessel

I agree with vesselguy.....

For this small vessel, legs are usually a better choice.

Do not include a skirt in the design unless there is a very good reason to have one (ie. very tall vessel - high seismic or wind loads)

-MJC

   

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