Page 210 - Pressure Vessel Design Manual

188 Pressure Vessel Design Manual

Dimensions for Angle Legs Dimensions for Pipe Legs
Min. Plate Min. Plate
Leg Size D X rn Thk Leg Size D E rn Thk
L2 in. x 2 in. 4 in. 1.5 1 % in. 3in. NPS 7% in. 4% in. 2.5 in. % in.
L2% in. x 2% in. 5 in. 1.5 1.25 % in. 4in. NPS 8% in. 5% in. 2.7 in. % in.
L3 in. x 3 in. 6 in. 1.75 1.5 M in. 6in. NPS 10 in. 7 in. 2.7 in. % in.
L4 in. x 4 in. 8 in. 2 2 % in. 8in. NPS 11% in. 8% in. 2.7 in. ?, in.
L5 in. x 5 in. 9 in. 2.75 2 % in. loin. NPS 14 in. 10 in. 3.2 in. '/8 in.
L6 in. x 6 in. 10 in. 3.5 2 ?, in. 12in. NPS 16 in. 12 in. 3.5 in. 1 in.

Moment where M is greater of MT or M,.
e Anchor bolts.
x = 0.5D +f - Y
Mt = TX Without uplift: design anchor bolts for shear only.
Y-a
f1 =h(y) T --
V
- NA,,
a2 B
Mc = 6 + 2f4
With uplift: design anchor bolts for full shear and tension
Thickness: force, T.
T
t = g h=-

PROCEDURE 3-13

DESIGN OF LUG SUPPORTS

w = uniform load on base plate, Ib/in.
Notation I = moment of inertia of compression plate, in.4
E,=modulus of elasticity of vessel shell at design
Q =vertical load per lug, Ib
Qa =axial load on gusset, Ib temperature, psi
Qt, =bending load on gusset, lb E, = modulus of elasticity of compression plate at design
n = number of gussets per lug temperature, psi
Fa = allowable axial stress, psi e =log base 2.71
Fb = allowable bending stress, psi Mb =bending moment, in.-lb
fa =axial stress, psi M, =internal bending moment in compression plate,
fb =bending stress, psi in.-lb
A =cross-sectional area of assumed column, in? K = spring constant or foundation modulus
Z = section modulus, in. 3 = damping factor