METTLER TOLEDO Weigh Module Systems Handbook
(12/99)14-10
Circular Tank with Four
Weigh Modules
The following sample shows how statics is used to calculate reaction forces for an
outdoor installation of a circular tank with four weigh modules.
F
F
d
W
c.g.
h
T
h
L
R
2
R
1
A
Figure 14-7: Circular Tank with Four Weigh Modules
Moment about point
A
due to
F
(horizontal force at tank’s center of gravity)
= - F [ h
L
+ 0.5 h
T
]
Moment about point
A
due to reaction force
R
1
= 2 R
1
d sin 45 °
If a tank is at equilibrium, the sum of the moments about point
A
will equal zero:
ΣM
A
= 0
Solve for
R
1
F [ h
L
+ 0.5 h
T
] = 2 R
1
d sin 45 °
R
1
=
F
1 414 d
.
[ h
L
+ 0.5 h
T
]
Note:
F
is a horizontal force applied
at the tank’s center of gravity. It is
usually denoted
F
W
for wind force
and
F
EQ
or
V
for seismic force.
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