2.3.9
Accessories
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NOTE: Consult the blower manufacturer to determine
silencer requirements.
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2.3.9.1
Silencers
Each blower shall be provided with [inlet] [and] [discharge] silencers.
Silencers shall be for [standard] [critical] grade silencing. Intake
silencers shall be of the [chamber] [absorption] type. Discharge silencers
shall be of the [chamber] [absorption] [combination chamber-absorption]
type. Silencer size shall be as recommended by the silencer manufacturer
and shall be compatible with the blower requirements. Silencer connections
shall match the adjacent piping. Mounting brackets shall be provided as
required for silencer support. Silencer shall be constructed of heavy-duty
rolled and welded steel plate with inner liner properly welded to outer
shell for purpose of deadening outer shell.
2.3.9.2
Acoustical Insulation
Silencers, [interior air piping], [expansion joints,] [valves,] [and]
[drive guards] shall be wrapped with 25 mm l inch thick high density woven
glass fiber mat having a minimum density of 4.6 kg/square meter 15 ounces
per square foot and shall be lagged with a 0.41 mm 0.0l6 inch thick
aluminum jacket. The Contractor shall comply with EPA requirements in
accordance with Section 01670 RECYCLED / RECOVERED MATERIALS.
2.3.9.3
Gauges
Gauges shall comply with ASME B40.100. Inlet gauges shall have a range of
[0 to 762 mm] [_____] [0 to 30 inches] [_____] water gauge vacuum. Outlet
gauges shall have a range of [0 to 103 kPa] [_____] [0 to 15 psi] [_____].
Gauges shall include all accessories for [control panel] [wall] [pipe]
mounting.
2.3.9.4
Thermometers
Thermometers shall be provided to indicate [inlet air temperature,]
[discharge air temperature,] [and] [lubrication oil temperature].
Thermometers shall be either red-reading mercury-in-glass type or dial
type. Scale range shall include full range of expected operation and up to
125 percent, but not more than 150 percent of maximum.
2.3.9.5
Temporary Screens
A temporary screen, consisting of 16-mesh wire backed up by 6.4 mm 1/4 inch
hardware cloth, shall be provided at the blower inlet connection. The
screens shall be removed after initial blower start-up and testing.
2.3.9.6
Inlet and Discharge Elbows
Inlet and discharge elbows shall be of the long sweep type constructed of
cast iron with ASME B16.1, Class 125 flanges.
2.3.9.7
Expansion Couplings
Couplings shall be extra heavy gauge rubber, wire reinforced type suitable
SECTION 11375A
Page 17
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