factory-built option, delete the sound enclosure
from this section and consider other means for
meeting noise abatement requirements, such as: (1)
other types of compressors which are furnished with
sound attenuating enclosures, (2) field erected
equipment enclosures from sources other than the
compressor manufacturer, and (3) soundproofed office
or personnel enclosure.
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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 to be 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.
2.4
AIR FLOW RATE AND PRESSURE RECORDER 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 10 kPa 40 inch water column differential at a full scale flow rate of
[_____] L/s SCFM at compressor based on 827 kPa (gage) 120 psig upstream
pressure. Static gage pressure measurement device of the recorder shall
have a range of zero to 1379 kPa (gage) 200 psig. Provide copper
interconnecting tubing between the pressure taps and the recorder as part
of this measurement and recording package. Provide a two-pen recorder for
the measurement station. Pens shall record pressure (0 to 1379 kPa (gage)
SECTION 15214N
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