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Ellipsoidal V.S Torispherical

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farzam

farzam

Mechanical
Joined
Nov 4, 2002
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79
Location
NL
Dear All,

I have a vessel with ID=3500mm,DP=55barg, DT=300c,my recommendation for head is 2:1 ellipsoidal but our fabricator considered an approximation based on UG32(d)with knuckle radius0.17D and a spherical radius 0.9D.Thats acceptable but for thickness calculation he has applied 0.9D instead of D at ellips. formula.whats your idea?is it correct?and why?

Thank you very much
 
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No, of course it isn't correct.
D is, as defined in UG-32(c), the inside diameter of the head skirt, and stays as such. The approximation permitted in UG-32(d) is only a matter of how to fabricate the head and of checking its shape, the calculation stays exactly as if it was an ellipsoidal.

prex
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Dear prex

I asked him about this matter and the fabricator clarified that he applied K=0.9 in the ellips. cal. formula with the specified h.is this a correct answer?

Thanks
 
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Dear prex,

depth of head (h) is 958mm.

Thanks
 
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Sorry, the depth would 875 mm of course.
As this head is deeper than a 2:1 ellipsoid, it may be true that its thickness is lower, but to prove this according to the code the correct procedure is in 1-4.

prex
: Online tools for structural design
: Magnetic brakes for fun rides
: Air bearing pads
 
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