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))
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
175 - 224 rpm
S-B
4.75
S-B
4.75
S-B
4.75
225 - 299 rpm
S-B
3.75
S-B
4.75
S-B
4.75
300 - 374 rpm
S-B
2.75
S-B
4.5
S-B
4.75
375 - 499 rpm
S-B
2.5
S-B
3.5
S-B
4.5
Over 500 rpm
S-B
1.75
S-B
2.5
S-B
3.5
Tubular
Centrifugal
and Axial Fans
(Note (2))
Suspended
H with deflection specified for
centrifugal blowers
Floor Mounted
S-B with deflections specified for
Arrangements 1 & 9
centrifugal blowers
Utility Fans
(Note (2))
Suspended
H with deflections specified for
centrifugal blowers but not to exceed
2.75 inches
Floor-Mounted
S-R with deflections not specified for
centrifugal blowers but not to exceed
2.75 inches
SECTION 15070N
Page 38
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