TABLE 3A
Vibration Isolator Types and Minimum Static Deflection
(MSD, mm) for 100-200 mm slab on grade and column supported.
Column
Slab on earth
9.1-12 meters
12.1-15 meters
Spacing
and 0-9 meter
Equipment
Type
MSD
Type
MSD
Type
MSD
_________
(Note (1))
(Note (1))
(Note (1))
requirements for the next wider column spacing. Except
for building slab on grade a minimum of 63.50 mm should
be used unless larger deflections are specified in the
centrifugal blower table.
b.
Provide sway brace isolators for tubular centrifugal and
axial fans when the fan pressure exceeds 996 Pa.
c.
Provide inertia bases for all fans in lieu of structural
steel bases or rails specified above when the fan
pressure exceeds 996 Pa.
d.
With attaching brackets, suspension spring isolators
bridge between the structure and the thrust-producing
machinery such as high-pressure fan. Both types H and
HR normally provide reaction in tension, while types
S, SV, and SX normally provide reaction in compression.
Thrust restraints are low-cost and effective components
available from manufacturers. Use thrust restraints to
eliminate the need for or reduce the magnitude of
inertia mass when the mass is only used to reduce the
displacement effects of the thrust.
TABLE 3A
Vibration Isolator Types and Minimum Static Deflection
(MSD, inches) for 4-8 inch slab on grade and column supported.
Column
Slab on earth
31-40 feet
41-50 feet
Spacing
and 0-30 feet
Equipment
Type
MSD
Type
MSD
Type
MSD
_________
(Note (1))
(Note (1))
(Note (1))
Absorption
SV-R
1.0
SV-R
1.75
SV-R
2.75
Refrigeration
Machines
Centrifugal
Chillers or
Heat Pumps
Hermetic Type
SV-B
1.75
SV-B
2.5
SV-B
3.5
Open Type
SV-1
1.75
SV-I
2.5
SV-I
3.5
Reciprocating Air
or Refrigeration
SECTION 15070N
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