TABLE 1A
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))
B
- Welded structural steel bases.
H
- Spring isolators (suspended equipment and piping). Where
required, provide with adjustable preloading devices.
HR - Thrust restraints
I
- Concrete inertia bases with steel forms.
NM - Neoprene mounts.
NP - Neoprene pads.
R
- Structural steel rail for equipment mounts.
S
- Freestanding spring isolators (floor-mounted equipment).
SV - Freestanding spring isolators (floor-mounted equipment).
SX - Freestanding spring isolators with adjustable cushioned
vertical stops and cushioned horizontal stops
(floor-mounted equipment. Protected spring isolators SX
may be substituted wherever S or SV is specified ans shall
meet all requirements.
(2)
Fans
a.
When fan motors are 56 kW or larger, use the deflection
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
SECTION 15070N
Page 12
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