BRD Noise & Vibration Control, Inc.

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HUSH FLOW

Treatment Strategy

Source Airborne

Application Use

OEM
Environmental
HVAC
Industrial In-plant
Industrial New Con.

Description

Industrial Machinery Mufflers

Industrial Grade Mufflers and Silencers To Tame Heavy Duty Process Machinery

Hoffman centrifugal blower silencer.

OEM reactive silencers for reciprocating compressors with customized side inlets.

Advantages:

Continuous weld durable and rugged tubular design/construction
Predictable acoustic and aerodynamic (pressure loss) performance
Three basic designs for low, high and broadband frequency reduction
Stock units in most designs up to 6" size
Threaded, flanged and tube connections
ASME code construction is available
Metric designs available
Aluminized and carbon steel standard construction (stainless steel, aluminum and other options available)
Intake air filter modules can be included on air inlet applications
Any combination of side and end pipe nozzle orientations
Mufflers can include brackets, legs, trunions, saddles and other supports

Applications:

Diesel engines and generator sets
Rotary positive, centrifugal and reciprocating pressure blowers
Centrifugal, axial, vane, screw and reciprocating compressors
Emergency power equipment
Expanders and companders
Steam ejectors
Vacuum pumps (dry and water sealed)
Pneumatic convey systems
Low pressure process air, gas and steam vents (see also HUSH VENT™ silencers)
Any air intake or discharge lines of rotating machinery
Aeration blowers (sewage treatment plants)
Material handling systems (snag free designs)
Marine engine exhaust

About BRD HUSH FLOW™ Mufflers/Silencers:

BRD HUSH FLOW™ mufflers consist of three basic designs to handle a broad range of machinery applications. The type AP designs utilize perforated steel internal construction where fibrous acoustical fill absorbs high frequency noise at 500 Hz and above. The type CR units have no fibrous packing but attenuate low frequency noise below 500 Hz using a series of internal chambers interconnected thorugh slotted or perforated choke tubes. In this design noise reduction is accomplished through expansion and contraction of the flow, reflection and cancellation in the chambers and by forced changes in direction of the flow. Type CO mufflers combine absorptive and reactive elements to provide good broadband performance across the entire frequency range.
	Type AP: absorptive/packed design; best high frequency performance

	Type CR: chamber/reactive design; best low frequency performance

	Type CO: combination design; best broadband performance

Customize Your Silencer:	Optional Accessories Available:
Custom designs and sizes to meet project requirements for DIL (dynamic insertion loss) acoustic performance and aerodynamic pressure loss limitations Mist pads and liquid separation elements can be incorporated Optional materials of construction include stainless steel, FRP, Monel and others ASME stamp for high pressure code applications Special construction and cleaning for oxygen service Special high temperature coatings Snag free internals for pneumatic convey and material handling systems Spark arrestor feature for engine exhaust Multiple piece construction for retrofits	Rain hoods Gaskets for flanges Support legs, brackets, mounting bands and other supports Paper, felt or wire mesh filter elements Exterior acoustic shell lagging Companion flanges Drains and inspection plugs Expansion joints/flex connectors Removable/replaceable internal elements OEM private label Finish painting (standard units are gray satin chrome-free primed) Long strand acoustical packing Fiberglass cloth, wire mesh and other liners for acoustical packing Double shell construction

HUSH FLOW™ Overview Chart

SILENCER MODEL	DESIGN/TYPE	APPLICATION	RECOMMENDED FREQ. RANGE	ABOVE/BELOW TRANS.SPEED**	AVERAGE ATTENUATION
AP-1	STRAIGHT-THRU ABSORPTION	BLOWERS* FANS COMPRESSORS	HIGH FREQUENCY BANDS	ABOVE TRANS. SPEED	15-20 dB
AP-2	STR.-THRU ANNULAR ABSORPTION	BLOWERS* FANS COMPRESSORS	HIGH FREQUENCY BANDS	ABOVE TRANS. SPEED	25-35 dB
CR-1	CHAMBER/REACTIVE	BLOWERS* COMPRESSORS	LOW-MID RANGE FREQUENCIES	ABOVE & BELOW	20-32 dB
CR-2	CHAMBER/REACTIVE	BLOWERS* COMPRESSORS	LOW FREQUENCY RANGE	BELOW TRANS. SPEED	20-30 dB
CO-3	COMBINATION CHAMBER/ABSORB.	BLOWERS* COMPRESSORS	FULL RANGE FREQUENCIES	ABOVE TRANS. SPEED	25-35 dB
CR-3	CHAMBER/REACTIVE	BLOWERS* COMPRESSORS	LOW-MID RANGE FREQUENCIES	BELOW TRANS. SPEED	30-35 dB
CO-1	COMBINATION CHAMBER/ABSORB.	BLOWERS* FANS COMPRESSORS	FULL RANGE FREQUENCIES	ABOVE TRANS. SPEED	17-26 dB
CO-2	COMBINATION CHAMBER/ABSORB.	BLOWERS* FANS COMPRESSORS	FULL RANGE FREQUENCIES	ABOVE TRANS. SPEED	22-32 dB
IF-1	INTAKE FILTER NO HOOD	BLOWERS* COMPRESSORS	ALL RANGES	ALL SPEEDS	N/A
IF-2	INTAKE FILTER WEATHERHOOD	BLOWERS* COMPRESSORS	ALL RANGES	ALL SPEEDS	N/A
IFS-1	INTAKE FILTER SILENCER	BLOWERS* COMPRESSORS	ALL RANGES	ALL SPEEDS	MINIMAL
IFS-3	IN-LINE FILTER UNIT	BLOWERS* COMPRESSORS	ALL RANGES	ALL SPEEDS	MINIMAL
SSCR-1	SEPARATOR/SILENCER CHAMBER/REACTIVE	VACUUM BLOWERS	LOW FREQUENCY RANGE	BELOW TRANS. SPEED	5-10 dB
SSCR-2	SEPARATOR/SIELNCER CHAMBER/REACTIVE	VACUUM BLOWERS	LOW FREQUENCY RANGE	BELOW TRANS. SPEED	10-15 dB
SSCO-1	SEPARATOR/SILENCER COMBINATION	VACUUM BLOWERS	FULL RANGE FREQUENCIES	ABOVE TRANS. SPEED	15-20 dB

* BLOWERS INCLUDE POSITIVE DISPLACEMENT, CENTRIFUGAL AND AXIAL.

** BLOWER TRANSITION SPEED IS A FUNCTION OF THE GEAR DIAMETER AND BLOWER RPM. THE PITCH-LINE VELOCITY (PLV) IS THE SPEED OF THE TIMING GEAR IN FEET PER MINUTE (FPM). THE PLV IS CONSIDERED CRITICAL AT 3300 FPM ON THE INTAKE AND 2700 FPM ONT HE DISCHARGE. BLOWERS ARE CHARACTERIZED AS BEING ABOVE OR BELOW THE TRANSITION SPEED (RPM). IF OPERATING ABOVE THE PLV, IT IS RECOMMENDED THAT A COMBINATION CHAMBER AND ABSORPTIVE TYPE SILENCER BE USED, SUCH AS THE CO-3 SERIES SILENCERS. WHEN OPERATING BELOW THE PLV A CHAMBER TYPE SILENCER SUCH AS THE CR-2 SERIES CAN BE UTILIZED FOR SUFFICIENT SILENCING.

ALL SILENCERS CAN BE USED FOR EITHER INTAKE OR DISCHARGE APPLICATIONS EXCEPT: CO-1 INTAKE SILENCER AND CO-2 DISCHARGE SILENCER.

IMPORTANT NOTE REGARDING HIGH PRESSURE: SILENCERS ARE DEISGNED TO OPERATE NEAR ATMOSPHERIC PRESSURES. IF THE OPERATING PRESSURE IS GREATER THAN 15 PSIG (LINE PRESSURE), A SPECIAL PRESSURE VESSEL SIELNCER CONSTRUCTED TO ASME CODE REQUIREMENTS IS RECOMMENDED. PLEASE CONSULT BRD NOISE AND VIBRATION CONTROL, INC.

Consult BRD Sales to Confirm Selection And Current Pricing (1-610-863-6300)

Mufflers and Sielncers for Stationary and Marine Engines

Stock units manufactured in residential, critical and hospital grade
Custom designs available
Rugged/durable design for severe service
Spark arrestor features
High temperature (1200°F) primer
Other optional coatings
Complete line of accessories available
Please contact BRD for current selection and pricing information
Inlet filters are also available
Stainless steel construction
Combination catalytic converter units

Nozzle Configuration Examples (For CO-1 Model)


End Inlet/End Outlet	Side Inlet/End Outlet	High Side Inlet/End Outlet	Opposite Side Inlet/Outlet
COE-1-6"	COS-1-6"	COH-1-6"	COT-1-6"

Other Nozzle Configurations Available Upon Request

HUSH FLOW™ Optional Supports


Vertical Shell Legs	Vertical Angle Legs	Horizontal Saddle Legs	Horizontal Shell Lugs

Model CO-3 silencers with Vertical Angle Support Legs quiet main engines at an oil refinery		Model CR-2 combination silencer/base design with Type "A" Acoustic Shell Lagging

		External Acoustical Shell Lagging
		Type A treatment consists of a 1/4" thick acoustic blanket wrapped around the vessel shell and encased within a heavy gauge metal jacket of gauge matching the shell.
		Type B treatment consists of a 1/4" thick acoustic blanket with 1" thick high desnity fiberglass overlay and a heavy gauge metal jacket (matches shell gauge) completely encasing the entire sielncer vessel.


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