TABLE 1A
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))
Over 7-1/2 hp
S-I
1.5
S-I
2.5
S-I
2.5
Base Mounted
Pumps
Up to 20 hp
S-I
1.5
S-I
2.5
S-I
2.5
20 to 75 hp
S-I
1.5
S-I
2.5
S-I
3.5
Over 75 hp
S-I
2.5
S-I
3.5
S-I
3.5
Cooling Towers and
SV with deflections specified for centrifugal
Evaporative Condensers
blowers when springs are supported on beams.
Use selection listed for column supported
floors with up to 30 foot column spacing when
springs are located on columns or bearing
walls
Factory
Assembled Air
Handling
Equipment
AH, AC and HV
Units
(Note (2))
Suspended
Units
Up to 5 hp
H
1.0
H
1.0
H
1.0
Over 5 hp
Up to 400 rpm
H
1.75
H
1.75
H
1.75
Over 401 rpm
H
1.0
H
1.5
H
2.5
Floor Mounted
Units
Up to 5 hp
S
1.0
S
1.0
S
1.0
Over 5 hp
Up to 400 rpm
S-R
1.75
S-R
1.75
S-R
2.5
Over 401 rpm
S-R
1.0
S-R
1.5
S-R
2.5
Centrifugal
Blowers
SECTION 15070N
Page 14
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