Page 110 - Pressure Vessel Design Manual

General Design 91

Optimum Vessel Proportions for Vessels with (2) 2:l S.E. Heads

Notation Equations
V =vessel volume, cu ft Le = L + 0.332D
P = internal pressure, PSlG
L=length, T-T, ft nD3 nD2L
T =shell thickness, in. v=-+-
W =vessel weight, Ib 12 4
D =diameter, ft
C =corrosion allowance, in. 4v
A =surface area, sq ft
F, =vessel ratios =
S =allowable stress, psi
E =joint efficiency
w = unit weight of plate, PSF W=AW
Le =equivalent length of cylinder equal to the A=2.18D2 + nDL
volume of a vessel with (2) 2:l S.E. heads
h =height of cone, ft
R =radius, ft t= PR +C
K, =constant for ellipsoidal heads SE - 0.6P

D

Diameter for Different L/D Ratios

--
UD D F:!=C (T

3
I

4

E
5

6

E
7

8