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2:1 Elliptical Heads Vs. F&D Heads

2:1 Elliptical Heads Vs. F&D Heads

2:1 Elliptical Heads Vs. F&D Heads

(OP)
Gentlemen,

    Does anyone know of or have a design standard they use when deciding whether to use a 2:1 Elliptical Head or an F&D Head in their design?  I know 2:1 Elliptical Heads are usually used for small and medium diameters, and higher pressures.  And F&D Heads are usually used for lower pressures and larger diameters.  If anyone has a standard relationship of pressure versus daimeter for these two types of heads, I would appreciate it.  Thanks...

RE: 2:1 Elliptical Heads Vs. F&D Heads

From the stress/strength perspective, SE head could retain higher pressure than flat/dish head. But the fabrication cost is higher as well, especially for the diameter vessel. In most cases, flat head is applied as a removeable cover but a head, just like a blind flange. But, the trade-off is the thickness.
Thanks.

RE: 2:1 Elliptical Heads Vs. F&D Heads

I've never seen a graph relatinng head (pressure)to diameter per say, but there are many which relate bulkhead stress to diameter.  I suspect this is what you are after.

On the other hand, it is extremely easy to develop your own formulae based on cross section profiles from Roarks Formulae for Stress & Strain.  You should push on your pencil a little and apply some very elementry computations to this problem.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

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