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))
Internal
Engines and
Engine
Driven Equip
750 rpm and
S
38.10
S
63.50
S
88.90
over
Dimmer Banks and
Up to 454 kg
NM
8.89
NM
8.89
S
88.90
Over 454 kg
SV
25.40
SV
25.40
SV
25.40
NOTES: (1)
Equipment Vibration Isolation Schedule Designations
(Hyphenated designations are combinations of the following:)
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 and
shall meet all requirements.
(2)
Fans
a.
When fan motors are 56 kW or larger, use the deflection
SECTION 15070N
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