2.3.12
Sound Attenuating Enclosure
The compressor package, including the driver motor, shall be contained
within a noise reducing enclosure. Design of the enclosure shall be such
as to limit noise transmission to 84 dBA or less at a distance of one meter
from the compressor in any direction.
2.3.12.1
Enclosure Frame
The enclosure frame shall be designed to support the weight of the sound
suppression panels and easily demountable. Connections to the base frame
shall be designed to allow the enclosure frame to be detached and lifted
away without damage to the connections, enclosure frame or base frame, and
to allow accessibility and replacement of any component.
2.3.12.2
Panels
The panels shall be of rigid construction to allow repeated access without
damage or distortion. Sound absorbing material shall be mineral fiber,
treated to preclude shedding of fibers. Other approved insulation may be
used except that polyurethane foam shall not be permitted. Top panels
shall be secured to the enclosure frame with quick disconnect fittings and
fabricated to allow easy hand removal for maintenance. End and side panels
shall be hinged or lift out with positive closure latches. Panels shall be
designed to allow the maximum access area when opened. Provide acoustic
seals as required. Controls and instrumentation mounted on the panels
shall have flexible connections for panel opening and disconnects for
enclosure removal. Disconnects shall be of the male-female plug type.
Panels shall split around all piping connections to allow enclosure removal
without detaching piping. Controls shall be visible and operable from
outside the enclosure.
2.3.12.3
Ventilation
Fan(s) and sound baffled ventilation grilles shall be provided as part of
the enclosure. Ventilation shall be sufficient to limit interior
temperature to that required for cooling the motor.
2.3.13
Isolating Pad
If specifically recommended by the compressor manufacturer, each compressor
steel or iron base frame shall be mounted on a neoprene waffle or rib type
isolator pad which extends uniformly and continuously along the base
mounting surface. The neoprene material shall be of bridge bearing pad
quality neoprene and shall be formulated for 40 durometer hardness. The
maximum bearing pressure on the isolating pad shall be 345 kPa 50 psi. The
pads shall be composed of two layers or 8 mm 5/16 inchneoprene bonded to
and sandwiching 16 gage galvanized steel. Compressor bolt down through the
pad shall be accomplished using 6 mm 1/4 inchthick neoprene impregnated
duck washers. Neoprene bushings are not acceptable.
2.4
AIR FLOW RATE AND PRESSURE RECORDER AND MEASUREMENT
Provide a complete flow and pressure measurement and recording package.
Provide orifice flanges with pressure taps, square edged stainless steel
paddle orifice plate. The orifice plate shall be concentric type, of 3 mm
0.125 inch thickness and shall meet ASME Standards. Orifice shall be sized
for 1016 mm 40 inch water column differential at a full scale flow rate of
SECTION 15215N
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