×
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

Dished Head Blank Diameters

Dished Head Blank Diameters

Dished Head Blank Diameters

(OP)
I am trying to find out the formula for the calculation of Blank Diameters for 2:1 Semi-Ellipsoidal, Torispherical and Hemispherical dished heads.

Please reply with full reference to the text (book or code).

Hasan.

RE: Dished Head Blank Diameters

I doubt that there is a single published formula- I'm sure the different head manufacturers have this worked out for their own particular forming processes.

For a start, you could assume the diameter of the blank was equal to the arc length up across the dome.

RE: Dished Head Blank Diameters

JStephen is more than likely right, each manufacturer will probably have their own way of doing it.  But could you not just use surface area formulas to determine the blank?  Then take the actual area and work the formula backwards to determine the starting diameter?  Surface area formulas:
SE = 1.084D^2
Hemi = pi*D^2/2
F&D (using 100% and 6%) = 0.9286D^2
D (diameter) is measured in feet.  I don't have any formulas for other F&D ratios.  I got these formulas from an old text book, but I only have a copy of the page so I can't confirm the book name or author.

RE: Dished Head Blank Diameters

Here are some downloadable spreadsheets for different heads and that give the approximate blank diameters.   
You have to remember that you have to have a different size blank depending on the head thickness and don't forget to allow for the forming allowance on the thickness.


http://www.pveng.com/Soft/Heads/Heads.htm

RE: Dished Head Blank Diameters

...and don't forget your straight flange.

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