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))
500 to 750 rpm
S-R
1.75
S-R
2.5
S-R
3.5
751 rpm and up
S-R
1.5
S-R
2.5
S-R
3.5
Reciprocating
Chillers or
Heat Pumps
500 to 750 rpm
SV-R
1.75
SV-R
2.5
SV-R
3.5
751 rpm and up
SV-R
1.5
SV-R
2.5
SV-R
3.5
Packaged Boilers
SV
1.0
SV
2.5
SV-R
3.5
Closed Coupled
Pumps
Up to 7 1/2 hp
S-I
1.0
S-I
1.0
S-I
1.0
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 deflection 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
SECTION 15070N
Page 37
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