Page 223 - Pressure Vessel Design Manual

Design of Vessel Supports 201
0.125tSk
-
Factor A = ___ -
R

Factor B = from applicable material
chart of ASME Code, Section 11.
Part D, Subpart 3

Anchor Bolts

0 Force per bolt due to uplij?
48Mb wb
f
’- dN N

0 Required bolt urea, AI,.
4 :d Base Plate diameter bolts

Use ( )
Note: Use four ‘?$-in.-diameter bolts as a minimum.

Butt
welded
+--
E = 0.7 Lap welded Bearing pressure, fc (uveruge at bolt circle).
E = 0.5
48M1, WI, -
f, = 2
na ndw
0 Required thickness of base plate, tl,.
tt, = I/- 3f,
20,000

Skirt
e Longitudinal force.s, fL,T and fL(..
in.
=
tsK = %e in. minimum
minimum
tsK
%e
3 x 3 x %in.
3
%in.
x
3
x
minimum
minimum
1h-1
1h-1 in.
in.
Figure 3-76. Typical dimensional data and forces for a vertical vessel
supported on a skirt. Notes
FI, = 0.66FV = 1. This procedure is based on the “neutral axis” method
and should he used for relatively small or simple ver-
tical vessels supported on skirts
2. If moment M1, is from seismic, assume Wi) as the oper-
F: =SO0 psi for 2000 lb concrete
ating weight at the base. If MI, is due to wind, assume
$50 psi for 3000 lb concrete empty weight for computing the maxinlrim value of frAT
and operating weight for fL(:.