ELLIPSOIDAL HEAD THICKNESS CALCULATION

Element Type
Element Diameter mm
Internal Design Pr. kPa
Internal Design Temp °C
Corrosion Allowance mm
Joint Efficiency
MATERIAL Help
Aspect Ratio
Ellipsoidal
RESULT
Max Allow Stress =
Thickness =

An excellent web based tool for Ellipsoidal Head thickness calculation under internal pressure. It also gives allowable Stress of material at a desired design temperature. This and many other tool for Pressure Vessel design as per ASME Section VIII Div. 1 would be useful for Static Equipment Engineer.

Ellipsoidal Head thickness calculation is based on para UG-32(d) of ASME Section VIII Division 1 2011 edition code book.

Where in Ellipsoidal Head thickness is given by:

t = P * D/(2SE – 0.2P)

where,
t = head thickness in corroded condition
P = Design pressure
D = inside diameter of head skirt
S = Maximum Allowable Stress at design temperature
E= Joint Efficiency

This tool also calculate head thickness on OD basis as per Appendix 1-4(c) of ASME Section VIII Div. 1, which is

t = P * Do*K/(2SE + 2P(K-0.1))
where,
Do = outside diameter of Head
K = a factor for ellipsoidal Head calculation.