ASME Thickness Unstayed Dished Head

(On concave side, when it is a segment of a sphere)

MKS: Diameter/Thickness- mm, Pressure/Stress- kg/cm2

SI: Diameter/Thickness- mm, Pressure/Stress- Mpa

FPS: Diameter/Thickness- in, Pressure/Stress- psi

Dishend OD D:

Shell/Drum Design Pressure, P:

kg/cm2

Stress Valus, S:

kg/cm2

Radius To Which Head is Formed (L):

Weld Reduction Factor, w:

Min Thk of Dish End, t:

ASME Thickness Unstayed Dished Head

(On concave side, when it is a segment of a sphere)

The thickness of a blank unstayed dished head with the pressure on the concave side, when it is a segment of a sphere, shall be calculated by the following equation:
where
L = radius to which the head is dished, measured on the concave side of the head
P = maximum allowable working pressure (hydrostatic head loading need not be included)
S = maximum allowable working stress, using values given in Section II, Part D, Subpart 1, Table 1A
t = minimum thickness of head
w = weld joint strength reduction factor per PG-26
PG-29.1.1 If local thin areas are present in the