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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 second note in paragraph entitled "Machinery
Airborne Sound Level Criteria" 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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2.1
CORROSION PROTECTION FOR STEEL PARTS
[ASTM A 123/A 123M] [ASTM A 653/A 653M] hot-dipped galvanized, or
equivalent manufacturer standard coatings. Where steel parts are exposed
to the weather, provide galvanized coating of at least 0.61 kg 2 ounces of
zinc per square meter foot of surface. Coat springs with neoprene.
2.2
NEOPRENE
ASTM D 471 and ASTM D 2240, Grade Durometer 40, 50, or 60, and oil
resistant.
2.3
FLOOR-MOUNTED ISOLATORS
2.3.1
Neoprene Isolation Pads
Provide pads at least 6 mm 1/4 inch thick with cross-ribbed or waffle
design. For concentrated loads, provide steel bearing plates bonded or
cold cemented to the pads.
2.3.2
Neoprene Isolators
Provide molded neoprene isolators having steel base plates
with mounting
holes and, at the top, steel mounting plates with mounting
holes or
threaded inserts. Provide elements of type and size coded
with molded
letters or color-coded for capacity identification. Embed
metal parts
completely in neoprene.
2.4
Provide spring isolators or protected spring isolators that are adjustable
and laterally stable with free-standing springs of horizontal stiffness at
SECTION 15070N
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