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))
d.
With attaching brackets, suspension spring isolators
bridge between the structure and the thrust-producing
machinery such as high-pressure fan. Both types H and HR
normally provide reaction in tension, while types S, SV,
and SX normally provide reaction in compression. Thrust
restraints are low-cost and effective components
available from manufacturers. Use thrust restraints to
eliminate the need for or reduce the magnitude of inertia
mass when the mass is only used to reduce the
displacement effects of the thrust.
**************************************************************************
NOTE: The following table serves only as a
guideline. Delete items that are not applicable.
**************************************************************************
TABLE 1B
Class II Vibration Isolator Types and Minimum Static Deflection
(MSD, mm) for basements below grade and floor slabs on earth
Equipment
Type (Note (1))
MSD
Absorption Refrigeration
NP
6.35
Machines
NM
8.89
Centrifugal Chillers
or Heat Pumps
Hermetic Type
NP
6.35
NM
8.89
Open Type
NM-I
8.89
Reciprocating Air or
Refrigeration Compressors
500 to 750 rpm
S
25.40
751 rpm and up
S
25.40
Reciprocating Chillers
or Heat Pumps
500 to 750 rpm
SV
25.40
751 rpm and up
SV
25.40
SECTION 15070N
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