Page 214 - Pressure Vessel Design Manual
P. 214
192 Pressure Vessel Design Manual
PROCEDURE 3-14
DESIGN OF BASE DETAILS FOR VERTICAL VESSELS #1
[5, 10, 14, 18, 191
6 =vessel deflection, in. (see Procedure 44)
Notation M, =bending moment per unit length in.-lbhn.
N = number of anchor bolts
Ab = required area of anchor bolts, in.2 n = ratio of modulus of elasticity of steel to con-
Bd = anchor bolt diameter, in. crete (see Table 3-35)
B, = allowable bearing pressure, psi (see P = maximum anchor bolt force, lb
Table 3-35) PI =maximum axial force in gusset, lb
b, =bearing stress, psi E =joint efficiency of skirt-head attachment
C =compressive load on concrete, lb weld
d = diameter of bolt circle, in. R,=root area of anchor bolt, in.2 (see
db =diameter of hole in base plate of compres- Table 3-32)
sion plate or ring, in. r = radius of bolt circle, in.
FLT = longitudinal tension load, Ib/in. W,, =weight of vessel at base, lb
FLC = longitudinal compression load, lb/in. W, =weight of vessel at tangent line, lb
Fb = allowable bending stress, psi w = width of base plate, in.
F, = allowable compressive stress, concrete, psi Z1 = section modulus of skirt, in.3
(see Table 3-35) St = allowable stress (tension) of skirt, psi
F, = allowable tension stress, anchor bolts, psi S, =allowable stress (compression) of skirt, psi
(see Table 3-33) G = width of unreinforced opening in shrt, in.
F, = minimum specified yield strength, psi C,,CT,J,Z,K = coefficients (see Table 3-38)
fh =bending stress, psi y1,yZ = coefficients for moment calculation in com-
f, = compressive stress, concrete, psi pression ring
f, = equivalent tension stress in anchor bolts, S = code allowable stress, tension, psi
psi El = modulus of elasticity, psi
Mb = overturning moment at base, in.-lb t, = equivalent thickness of steel shell which
M, = overturning moment at tangent line, in.-lb represents the anchor bolts in tension, in.
M,=unit bending moment in base plate, T = tensile load in steel, lb
circumferential, in.-lbhn. u = Poisson’s ratio, 0.3 for steel
M, =unit bending moment in base plate, radial, B = code allowable longitudinal compressive
in.-lb/in. stress, psi
H = overall vessel height, ft
