TABLE 1B
Class II Vibration Isolator Types and Minimum Static Deflection
(MSD, inches) for basements below grade and floor slabs on earth
Equipment
Type (Note (1))
MSD
Centrifugal Chillers
or Heat Pumps
Hermetic Type
NP
0.25
NM
0.35
Open Type
NM-I
0.35
Reciprocating Air or
Refrigeration Compressors
500 to 750 rpm
S
1.0
751 rpm and up
S
1.0
Reciprocating Chillers
or Heat Pumps
500 to 750 rpm
SV
1.0
751 rpm and up
SV
1.0
Packaged Boilers
NP
0.25
NM
0.35
Pumps
Closed Coupled
NP
0.25
Up to 7 1/2 hp
NM
0.35
Over 7 1/2 hp
S-I
1.0
Base Mounted
Up to 20 hp
S-I
1.0
20 to 75 hp
S-I
1.0
Over 75 hp
S-I
1.0
Cooling Towers and
NP
0.25
Evaporative Condensers
NM
0.35
Factory Assembled Air
AC and HV Units
(Note (2))
Suspended Units
Up to 5 hp
H
1.0
SECTION 15070N
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