Standard F&D Head
Standard F&D Head
(OP)
Are standard F&D heads typically used for a pressure vessel of up to 25 psi? If so, what formulas should be used to calculate the required thickness? Looking at the ASME formulas and the small knuckle radius typically found on the standard heads, seems to indicate that the M factor will be outside the allowable ranges. If this is the case how is the required thickness of these heads determined with such a small knuckle?





RE: Standard F&D Head
RE: Standard F&D Head
EJL
RE: Standard F&D Head
RE: Standard F&D Head
It is important to distingush between two major categories of torospherical heads:
1) ASME heads (commonly called ASME torospherica or ASME F&D heads, and..
2) All others
ASME vessel heads should have a dish radius no greater than its diameter. The knuckle radius should be no less than 6% of the diameter or three times the metal thickness, whichever is greater.
http://www.prentex.com/glossary.php
MJC
RE: Standard F&D Head
Seems like I've heard of different knuckle radiuses being used on these; they're not really "standard" in that sense. I think one manufacturer used twice the thickness, one used 2", etc.
RE: Standard F&D Head
I calculated a couple to 1-4(f), actually the paper 1-4(f) is based upon, and found that they were much too far on the wrong side of the line for my liking. We even had a competitor's tank where the head buckled in the knuckle under a pressure test.
EJL
RE: Standard F&D Head
RE: Standard F&D Head
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