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
750 rpm and over
S
1.0
Dimmer Banks and
Up to 1000 lbs.
NP
0.25
NM
0.35
Over 1000 lbs.
SV
1.0
NOTES:
Note (1) and Note (2) are same as for TABLE 1A.
Provide vibration isolators [and seismic snubbers] for mechanical and
electrical machinery and associated piping and ductwork [as indicated], to
minimize transmission of vibrations and structure borne noise to the
building structure or spaces or from the building structure to the
machinery. Comply with the following vibration schedule.
1.4.6
Machinery Airborne Sound Level Criteria
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NOTE: Depict on drawings one table for each piece
of machinery proposed for the project. Provide
information in project specification, if drawings do
not show the sound data schedule." Depict on the
Table as follows: (1) Machine Airborne Sound Power
Levels (dB) or (2) the Machine Airborne Sound
Pressure Levels (dB) with maximum level expressed in
pressure re 20 uPa or Power re one pW for octave
band level center frequencies in Hz at 63, 125, 250,
500, 1,000, 2,000, 4,000, 8,000 Hz and overall level
dB. Indicate the sound power level or sound
pressure levels, depending upon applicable
measurement standard. Refer to DM-3.10 and TABLE 2A
in below note for sound data selection. Further
details may be found in the current ASHRAE System
Handbook, Chapter entitled "Sound and Vibration
Control." When no standard exists, solicit sound
data from manufacturer and refer to DM-3.10 for
guidance. The dB(A) scale and peak pressure level
noise values specified are stated to preclude adding
requirements of OPNAVFAC INST 5100.23B concerning
hearing conservation and noise abatement programs.
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NOTE: The following serves only as a simplified
guideline, without considering different types of
the same kind of equipment. Delete items that are
not applicable.
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SECTION 15070N
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