Head plate

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ADApproximate ellipsoidal dished head

Approximate ellipsoidal dished head
Specified in JIS B 8247, this product is similar to the ED head plate in shape, but with specified values for the internal radii at the center and rounded corner. It’s often used for the bottom head of vertical vessels.

Industry/purpose

Plants, food, and chemicals

Product shape

Approximate ellipsoidal dished head drawing
Symbols and descriptions
H = Height
h = Height minus flange length
l = Flange length
R = Internal radius at center (crown radius)
r = Internal radius of rounded corner (knuckle radius)
t = Thickness (nominal thickness)
T. L. = Tangent line
D = Internal diameter

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