blower

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Rotary Positive Blowers The Rotary Positive Blower is a two impeller compressor that delivers a large quantity of gas or air relative to the individual pulses. Blower capacities are expressed in CFM at inlet conditions (ICFM). Blower size is usually expressed as gear diameter by rotor length. Pitch Line Velocity (PLV) is the peripheral velocity of the timing gear—equal to the product of the gear circumference and the rotative speed of the blower, usually expressed in feet per minute (FPM). The blower presents two problems: 1) pulsation within the piping system and, 2) noise radiation in the vicinity of the blower and piping. The importance of these relative to each other is a function of blower size and speed; both increase proportionately to the blower size and the square of the speed. Pulsation is more pronounced on the discharge side. Peak pulse pressures are quite severe and can result in unsilenced discharge sound power levels up to 140–145 dB. The inlet, although producing less severe pulsation and noise, receives equal attention since the inlet is usually open to atmosphere and the noise much more apparent. Silencers There is little question that silencers are a necessity on any blower installation. Regardless of the size or speed of the blower, silencers of some type are nearly always used. In the selection of blower silencers, there are two basic considerations: 1) the silencer must be the correct size (i.e., sufficient capacity for the volume flow) and, 2) the silencer must be the proper type for the application. The nominal silencer size need only be based on the gas volume, (i.e., the CFM of the gas or air at the operating conditions). However, the silencer (design) must be selected with consideration of the blower size and operating speed. Complete application and capacity information is given on page 2.3. There are two types of silencers commonly used on positive blowers: a reactive type silencer which consists of a series of expansion chambers having interconnecting tubes, a more sophisticated silencer design. is the combination chamber-absorptive type. This combination silencer is similar to the reactive type with the exception that an acoustically-packed, sound absorbing section is included, comprising an extension of the silencer connection closest to the blower. The inlet of a discharge silencer and the outlet of an inlet silencer are the ends having the packed section. A third basic type of silencer—the simple, straight-through packed type—is occasionally used on blowers. This type of silencer is usually used on small, high speed machines which characteristically produce significant high frequency noise and relatively mild pulsations. The PLV is normally the criterion for silencer type selection. If the blower is operating in the critical PLV range, it will generate objectionable high frequency noise which may cause shell ring or tank hammer in the piping and silencer. These critical PLV conditions will always require a combination chamber-absorptive silencer for satisfactory results. Inlet Silencers For inlet service, a PLV of 3,300 ft/min or greater is considered critical. This transition speed is empirically established and is somewhat arbitrary, however, it is commonly accepted that blowers operating at or above 3,300 ft/min are considered critical for the purpose of inlet silencer application. Those operating below 3,300 ft/min are considered subcritical. Subcritical PLV applications can usually be silenced adequately with a chamber-type silencer, such as Universal URB or UCI Series. Blowers operating above the critical PLV of 3,300 ft/min will invariably require the RIS Series combination chamber- absorptive type silencer. Inlet Filters or Filter Silencers are commonly used on blower inlets, either individually or in series with a separate inlet silencer. Please reference the Filters and Filter Silencers section of this catalog for further information. Discharge Silencers For the more severe discharge conditions of typical blower installations, a PLV of 2,700 ft/min is accepted as the critical transition speed. Blowers operating below 2,700 ft/min are considered subcritical and can usually be adequately silenced on the discharge side by use of a chamber-type silencer UCD or URD Series. Machines operating above the 2700 ft/min transition speed will require combination chamber- absorptive silencers such as SD or RD Series. In some larger blower installations, piping requirements or space restrictions may preclude the use of a large, single discharge silencer such as the SD or RD Series. Where two or more blowers discharge into a common header, individual silencers upstream of the header are required to subdue the individual blower pulsations. Otherwise, the pulsations tend to beat with each other and can be extremely objectionable. Note: Silencers should be mounted as close to the blower as possible since any piping between the blower and silencer will radiate noise. Standard silencer connections are not designed to carry external piping or valve loads, so good piping support practices should be used to prevent stresses that cause fatigue and eventual fracture of the silencer or piping. It is also good practice to isolate the blower from the silencer with a flexible expansion joint. Contact Universal Silencer for special design considerations where loading is a factor. Attenuation Curves Noise attenuation curves are given for the various models within this section. The curves represent insertion loss of airborne noise for typical applications under average conditions. It is not feasible to chart the expected performance of a silencer over a wide range of applications and conditions, therefore, the curves must be used with discretion. Structure-borne noise (see above) may be a consideration and will require separate analysis, since it is not airborne noise and not used for silencer performance rating. Rotary Positive Blower Silencers 2.1 Blower Silencers 1 2 3 4 5 6 7 8 2.1 See pages 1.1–1.3 for ordering information | www.universalsilencer.com 9 10 General Information Blower Silencers In a closed blower discharge system, structure-borne noise—such as that radiated by pipe wall and silencer shell—may be a consideration, particularly where a stringent, close-proximity noise specification applies. For these applications, various means are available to treat the pipe and shell radiated noise, such that most reasonable specifications may be met. For instance, it is possible to lag the silencer shell externally and reduce any shell noise contribution to below the casing and mechanical noise of the blower and driving machinery. Universal Silencer invites your inquiries concerning special applications where EPA, OSHA or other noise specifications apply. Special applications are handled on an individual basis and recommendations are made according to specific requirements of the installation.

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  • Rotary Positive BlowersThe Rotary Positive Blower is a two impellercompressor that delivers a large quantity ofgas or air relative to the individual pulses.Blower capacities are expressed in CFM atinlet conditions (ICFM). Blower size is usuallyexpressed as gear diameter by rotor length.Pitch Line Velocity (PLV) is the peripheralvelocity of the timing gearequal to theproduct of the gear circumference and therotative speed of the blower, usuallyexpressed in feet per minute (FPM).

    The blower presents two problems:1) pulsation within the piping system and,2) noise radiation in the vicinity of the blowerand piping.

    The importance of these relative to each otheris a function of blower size and speed; bothincrease proportionately to the blower sizeand the square of the speed.

    Pulsation is more pronounced on thedischarge side. Peak pulse pressures are quitesevere and can result in unsilenced dischargesound power levels up to 140145 dB. Theinlet, although producing less severe pulsationand noise, receives equal attention since theinlet is usually open to atmosphere and thenoise much more apparent.

    SilencersThere is little question that silencers are anecessity on any blower installation.Regardless of the size or speed of the blower,silencers of some type are nearly always used.

    In the selection of blower silencers, there aretwo basic considerations: 1) the silencer mustbe the correct size (i.e., sufficient capacity forthe volume flow) and, 2) the silencer must bethe proper type for the application. Thenominal silencer size need only be based onthe gas volume, (i.e., the CFM of the gas orair at the operating conditions). However, thesilencer (design) must be selected withconsideration of the blower size andoperating speed. Complete application andcapacity information is given on page 2.3.

    There are two types of silencers commonlyused on positive blowers: a reactive typesilencer which consists of a series ofexpansion chambers having interconnecting

    tubes, a more sophisticated silencer design.is the combination chamber-absorptive type.This combination silencer is similar to thereactive type with the exception that anacoustically-packed, sound absorbingsection is included, comprising an extensionof the silencer connection closest to theblower. The inlet of a discharge silencer andthe outlet of an inlet silencer are the endshaving the packed section.

    A third basic type of silencerthe simple,straight-through packed typeis occasionallyused on blowers. This type of silencer is usuallyused on small, high speed machines whichcharacteristically produce significant highfrequency noise and relatively mild pulsations.

    The PLV is normally the criterion forsilencer type selection. If the blower isoperating in the critical PLV range, it willgenerate objectionable high frequency noisewhich may cause shell ring or tank hammerin the piping and silencer. These critical PLV conditions will always require acombination chamber-absorptive silencerfor satisfactory results.

    Inlet SilencersFor inlet service, a PLV of 3,300 ft/min orgreater is considered critical. This transitionspeed is empirically established and issomewhat arbitrary, however, it is commonlyaccepted that blowers operating at or above3,300 ft/min are considered critical for thepurpose of inlet silencer application. Thoseoperating below 3,300 ft/min are consideredsubcritical. Subcritical PLV applications canusually be silenced adequately with achamber-type silencer, such as Universal URBor UCI Series. Blowers operating above thecritical PLV of 3,300 ft/min will invariablyrequire the RIS Series combination chamber-absorptive type silencer. Inlet Filters or FilterSilencers are commonly used on blowerinlets, either individually or in series with aseparate inlet silencer. Please reference theFilters and Filter Silencers section of thiscatalog for further information.

    Discharge SilencersFor the more severe discharge conditions oftypical blower installations, a PLV of2,700 ft/min is accepted as the criticaltransition speed. Blowers operating below2,700 ft/min are considered subcritical andcan usually be adequately silenced on thedischarge side by use of a chamber-typesilencer UCD or URD Series. Machinesoperating above the 2700 ft/min transitionspeed will require combination chamber-absorptive silencers such as SD or RD Series.

    In some larger blower installations, pipingrequirements or space restrictions maypreclude the use of a large, single dischargesilencer such as the SD or RD Series.

    Where two or more blowers discharge into acommon header, individual silencers upstreamof the header are required to subdue theindividual blower pulsations. Otherwise, thepulsations tend to beat with each other andcan be extremely objectionable.

    Note: Silencers should be mounted as closeto the blower as possible since any pipingbetween the blower and silencer will radiatenoise. Standard silencer connections are notdesigned to carry external piping or valveloads, so good piping support practicesshould be used to prevent stresses thatcause fatigue and eventual fracture of thesilencer or piping. It is also good practice toisolate the blower from the silencer with aflexible expansion joint. Contact UniversalSilencer for special design considerationswhere loading is a factor.

    Attenuation CurvesNoise attenuation curves are given for thevarious models within this section. The curves represent insertion loss ofairborne noise for typical applications underaverage conditions. It is not feasible to chartthe expected performance of a silencer overa wide range of applications and conditions,therefore, the curves must be used withdiscretion. Structure-borne noise (seeabove) may be a consideration and willrequire separate analysis, since it is notairborne noise and not used for silencerperformance rating.

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    GeneralInformationBlower Silencers

    In a closed blower discharge system,structure-borne noisesuch as that radiatedby pipe wall and silencer shellmay be aconsideration, particularly where a stringent,close-proximity noise specification applies. For these applications, various means areavailable to treat the pipe and shell radiatednoise, such that most reasonablespecifications may be met.

    For instance, it is possible to lag the silencer

    shell externally and reduce any shell noisecontribution to below the casing and mechanicalnoise of the blower and driving machinery.

    Universal Silencer invites your inquiriesconcerning special applications where EPA,OSHA or other noise specifications apply.Special applications are handled on anindividual basis and recommendations aremade according to specific requirements ofthe installation.

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    GeneralInformation

    Rotary Positive Blowers

    The silencers shown below are more fullydescribed on the individual catalog pages.These units are designed specifically for useon Rotary Positive Blowers.

    There are fundamental similarities betweenblower silencers and other types, particularlyreciprocating engine silencers, which alsorequire a silencer design that provideseffective pulse control as well as noise

    attenuation. However, blower silencersgenerally must be constructed moreruggedly to withstand prolonged exposure tosevere pulsations produced by the blower.

    All silencers described are of standard withend in, end-out design. Low or high sideinlet and outlet connections are availableand are described on the individual catalog pages.

    UCI SeriesInlet SilencerChamber-type inlet silencer for use on sub-critical PLV applications. Available in pipesizes 8"30". Smaller sizes use URB Series.Available with side connections andmounting brackets.

    SD SeriesRD SeriesDischarge SilencersCombination chamber-absorptive typedischarge silencers for critical PLVapplications. Available in pipe sizes 2"30".Low, high, or opposed side connections andmounting brackets available on most sizes.

    UCD SeriesURB/URD SeriesDischarge SilencersChamber-type discharge silencer for use onsub-critical PLV applications. Available inpipe sizes 8"30". (Smaller sizes use URBSeries). Low, high, or opposed sideconnections and mounting brackets available.

    RIS SeriesInlet SilencerCombustion chamber-absorptive type inletsilencer for critical PLV applications.Available in pipe sizes 2"30". Low or highside outlet and mounting brackets availableon most sizes.

    Accessories,Special Features

    Mounting Brackets

    Inspection Openings

    Pressure Vessel Construction

    Oversize Flanges

    Special Finishes

    Special Materials

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    Transition Speed-RPM

    Application,Capacity,Pressure Drop DataBlower Silencers

    BlowerGear Size Inlet Discharge

    22345678

    1012141618202224

    6,3005,0404,2003,1502,5202,1001,8001,5751,2601,050

    900785700630570525

    5,1554,1253,4352,5752,0601,7201,4701,2901,030

    860735645570515470430

    Blower Transition Speed1

    Pitch LineVelocity

    BelowTransition

    InletSilencer

    UCI, URB

    DischargeSilencer

    URB, UCD,URD

    AboveTransition RIS SD, RD

    Silencer Model Specifications2

    P = V40052c

    P c V4005 P14.7 530T

    Silencer RecommendationsAs mentioned on page 2.1 pitch line velocity(PLV) is the speed of the timing gear in feetper minute (ft/min). For purposes of silencerapplication. PLV is considered critical at3,300 ft/min for intake and 2,700 ft/min fordischarge.

    Table 1 gives transition speeds in RPM.Blowers running at these speeds or greaterwill have critical PLV. Operating speeds belowtransition will be in the sub-critical range.Blowers operating in the sub-critical speedrange usually require only simple chamber-type silencers while those in the critical rangerequire combination chamber-absorptive typesilencers. If there is doubt, it is best to usethe combination-type silencers. When gearsize and operating speeds are known, theproper type silencer is easily selected.

    Silencer Size Selection, CapacityTable 3 gives the nominal capacity of thevarious size silencers. Size in this tablerefers to the silencer nominal size, or itsinlet size. Capacities are expressed in inletCFM (ICFM), thus, discharge silencers arerated at higher capacities than inlet silencerssince the air is compressed to reducedvolume at the discharge operating pressure.

    A From Table 1 determine whether blowerRPM is above or below the transitionspeed for critical PLV.

    B Consult Table 2 for recommendedsilencer models.

    Pressure DropThe following formulas may be used tocalculate pressure drop through thesilencers covered in this catalog.

    Inlet:

    (assumes silencer inletis open to atmosphere)

    Discharge:

    P = pressure drop through silencer,inches of water

    V = air velocity through silencer,ft/min*

    c = individual silencer restrictioncoefficientempirical constant(see Table 4)

    P = discharge pressure, PSIA(operating pressure in PSIG + 14.7)

    T = discharge temperature, Rabsolute (operating temperature inF + 460)

    * To calculate velocity through silencer, divide flow inACFM by cross-sectional area of silencer inlet diameterin square feet.

    2

    Size

    1122334568

    1012141618202224262830

    Est Temp.

    3070

    120190270370480750

    1,0801,9203,0004,3005,9007,7009,700

    12,00014,50017,30020,30023,50027,000

    70F

    3580

    140220320430560880

    1,2602,2503,5205,0706,8909,000

    11,40014,00017,00020,20023,80027,60031,700115F

    4085

    150235335455600935

    1,3402,3903,7305,3707,3109,550

    12,10014,90018,10021,50025,20029,30033,600140F

    4090

    160245355480630985

    1,4102,5103,9305,6607,700

    10,00012,70015,70019,00022,60026,60030,80035,400165F

    4095

    165255370505660

    1,0301,4802,6304,1105,9208,060

    10,50013,30016,40019,90023,70027,80032,20037,000190F

    45105185285415560735

    1,1501,6502,9404,5906,6008,990

    11,80014,90018,40022,20026,40031,00036,00041,300240F

    Silencer Capacity3

    Inlet Silencer4 PSIG

    Discharge Silencer

    Capacity (Inlet CFM 14.7 PSIA at 70F)

    6 PSIG 8 PSIG 10 PSIG 15 PSIG

    URB, URBYUCI, UCIY, UCIHRIS, RISY, RISHUCD, UCDYURD, URDY, URDHSD, SDY, SDHRD, RDY, RDHRDS, SDS, URDS

    4.24.24.24.24.24.24.27.0

    Model Pressure DropCoefficient (C)

    Pressure Drop Coefficients4

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    SpecificationsUCI Group

    Chamber TypeInlet Silencer

    40

    50

    63 125 250 500 1K 2K 4K 8K

    30

    Octave Band Center Frequency, Hz

    Attenuation, dB

    Typical Attenuation Curve

    10

    0

    20

    The UCI Series Inlet Silencer is a heavy-duty, all welded unit constructed of carbonsteel sheet and plate. It provides pulsecontrol and silencing for most subcriticalPLV applications. Sizes 8" and larger areequipped with flanged connections drilled to

    125/150 lb ANSI specifications. Exteriorsurfaces receive a shop coat of rust-inhibitive primer and may be finish paintedin the field if desired. The UCI Series is thebasic inlet model and is the conventionalend-in,end-out version. The low side inlet

    DrainP

    N

    N

    L H D

    K

    Y

    K

    Y

    UCI Series UCIY Series(Low Side Outlet)

    UCIH Series(High Side Outlet)

    model is designated UCIY Series and thehigh side inlet type is designated UCIHSeries. The three types are fundamentallyalike and performance is identical. Mountingbrackets and other options are availablesee page 2.11.

    PartNumber D L N H K

    Min Max

    P(Size)

    Min Max

    UCIY UCIH

    Y

    Weight

    Chamber Type Inlet Silencers

    Sizes 1"6" Use URB Series (page 2.7)

    Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.

    53-108-AA53-110-AA53-112-AA53-114-AA53-116-AA53-118-AA53-120-AA

    53-124-AA53-126-AA53-128-AA53-130-AA

    2226303036424248545460

    45

    698091

    103114126138149161173

    250360550

    9501,2001,3501,9502,5002,7503,4004,650

    1122334568

    101214161820

    24262830

    61748799

    113126140153167179193

    33333344444

    54678092

    106119131144158170184197

    1416

    182124252831313437

    911

    131517192022232527

    2127

    40485560667285

    9587

    2834

    47535967758384

    10091

    206 466

    53-122-AA22

    650

    5741341218

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    SpecificationsRIS GroupCombination Chamber-Absorptive TypeInlet Silencer

    PartNumber D L N H

    54-102-AA54-125-AA54-103-AA54-135-AA54-104-AA54-105-AA54-106-AA54-108-AA54-110-AA54-112-AA54-114-AA54-116-AA54-118-AA54-120-AA54-122-AA54-124-AA54-126-AA54-128-AA54-130-AA

    888

    10101214182226303642424854546066

    28333939455764728598

    111113126140153167179193206

    3333333333333444444

    22273333395158657891

    104106119131144158170184197

    89

    1011121517212529303541474654556166

    141720263238404957626575768493

    223456700000000

    FIXED AT 6

    2" THRU 3"AVAILABLE ON

    SPECIAL ORDER

    FIXED AT 7FIXED AT 7FIXED AT 8

    799

    121315161820222325252930

    162325303744505158636975879198

    3040434961698156627078868695

    103

    P(Size)

    1122334568

    1012141618202224262830

    RISY RISH

    KE

    Min Max

    RISY RISH

    Y

    Min Max

    Weight

    3243495465778988

    100111123135147157170

    252530405080

    110190380550800

    1,0501,3501,5002,1002,7003,0503,8505,150

    Combination Chamber-Absorptive Type Inlet Silencers

    Sizes 1"1" use U5 Series (page 3.2)

    The RIS Series Inlet Silencer is a heavy-duty, all welded unit constructed of carbonsteel sheet and plate. It features anacoustically-treated outlet and will providepulse control and silencing suitable forcritical PLV applications. Sizes 4" and largerare equipped with flanged connectionsdrilled to 125/150 lb ANSI specifications.

    Smaller sizes are standard with malethreaded pipe nipples. Units sized 4" and 5"are available in either flanged or male pipethreads. Exterior surfaces receive a shopcoat of rust inhibitive primer and may befinish painted in the field if desired. The RIS Series is the basic model, havingconventional end-in, end-out configuration.

    P

    N

    N

    L H D

    K

    Y

    K

    Y

    E

    Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.

    *Specify -TT for male pipe threaded units.

    40

    50

    63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz

    Attenuation, dB

    Typical Attenuation Curve

    30

    10

    0

    20

    RIS Series RISY Series(Low Side Outlet)

    RISH Series(High Side Outlet)

    A low side outlet version is designated RISYSeries and high side outlet configuration isdesignated RISH Series. The three types arefundamentally alike and performance isidentical. Mounting brackets and otheroptions are availablesee page 2.11.

    **

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    SpecificationsUCD Group

    Chamber TypeDischarge Silencer

    The UCD Series Discharge Silencer is aheavy-duty, all welded unit constructed ofcarbon steel sheet and plate. It providespulse control and silencing for subcriticalPLV applications where the higherperformance of the URD Series on page 2.7

    is not warranted. Sizes 8" and larger areequipped with flanged connections drilled to125/150 lb ANSI specifications. Exteriorsurfaces receive a shop coat of rust-inhibitive primer and may be finish paintedin the field if desired. The UCD Series is the

    PartNumber D L N H K

    56-108-AA56-110-AA56-112-AA56-114-AA56-116-AA56-118-AA56-120-AA56-122-AA56-124-AA56-126-AA56-128-AA56-130-AA

    222630303642424854546066

    61748799

    113126140153167179193206

    333333444444

    54678092

    106119131144158170184197

    141618182124252831313437

    P(Size)

    1122334568

    1012141618202224262830

    Min

    91112131517192022232527

    Max

    Y

    212734404855606672858795

    Weight

    250360550650900

    1,2001,3501,9502,5002,7503,4004,650

    Chamber Type Discharge Silencers

    DrainP

    N

    N

    L H D

    K

    Y

    Sizes 1"6" use URB Series (page 2.7)

    Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.

    40

    50

    63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz

    Attenuation, dB

    Typical Attenuation Curve

    30

    10

    0

    20

    UCD Series UCDY Series(Low Side Inlet)

    basic end-in, end-out configuration. A lowside inlet version is designated UCDY Series.The two types are fundamentally alike andperformance characteristics are identical.Mounting brackets and other options areavailablesee page 2.11.

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    SpecificationsURB GroupURD GroupChamber TypeDischarge Silencer

    Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.

    *Specify -TT for male pipe threaded units.

    PartNumber D L N H

    55-101-AA55-115-AA55-102-AA55-125-AA55-103-AA55-135-AA55-104-AA55-105-AA55-106-AA55-108-AA55-110-AA55-112-AA55-114-AA55-116-AA55-118-AA55-120-AA55-122-AA55-124-AA55-126-AA55-128-AA55-130-AA

    468

    101012141618222630364248485454606672

    21243334465253657297

    122135161181188202204239259279304

    223333333333333444444

    17202728404647596690

    115128154174181193195230250270295

    7889

    101112141618212427283131343740

    6689

    1112141618192122252729

    222932486369819298

    103103126132144161

    82

    106117141158164175175210228246272

    627688

    107119126134137156175188203

    89

    10121415171921222425273132

    K

    Min

    URBY, URDY URDH URDS

    Y

    Max Min Max Min Max

    Weight

    161922294042495556616076788596

    10152030405570

    120160370550800

    1,2501,6002,3002,5002,9503,4504,4006,1507,250

    Chamber Type Discharge Silencers

    The URB/URD Series Discharge Silencer isa heavy-duty, all welded unit constructed ofcarbon steel sheet and plate. It providespulse control and silencing for subcriticalPLV applications. Sizes 4" and larger areequipped with flanged connections drilled to125/150 lb ANSI specifications. Smallersizes are standard with male threaded pipe

    nipples. Units sized 4" and 5" are available ineither flanged or male pipe threads. Exteriorsurfaces receive a shop coat of rust-inhibitive primer and may be finish paintedin the field if desired. The URB/URD Seriesis the basic end-in, end-out configuration. A low side inlet version is designatedURBY/URDY Series; high side inlet is

    P

    N

    N

    L H D

    P(Size)

    1122334568

    1012141618202224262830

    K

    Y

    K

    Y

    K

    Y

    K

    Note: Sizes 1"6" are URB Series;sizes 8"30" are URD Series. Both series arefundamentally the same in design and theperformance characteristics are identical.

    FIXED AT 6FIXED AT 7FIXED AT 7FIXED AT 8

    40

    50

    63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz

    Attenuation, dB

    Typical Attenuation Curve

    30

    10

    0

    20

    URB,URD Series

    URBY,URDY Series(Low Side Inlet)

    URDH Series(High Side Inlet)

    URDS Series(Opposed Connections)

    designated URDH Series; and low opposedconnection is designated URDS Series. Thefour types are fundamentally alike andperformance characteristics are identical.Mounting brackets and other options areavailablesee page 2.11.

    **

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    Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.

    *Specify -TT for male pipe threaded units.

    SpecificationsSD Group

    Combination Chamber-Absorptive Type

    Discharge Silencer

    The SD Series Discharge Silencer is aheavy-duty, all welded unit constructed ofcarbon steel sheet and plate. It will provideexcellent pulse control and is equipped withan acoustically-treated inlet for use oncritical PLV applications. Its pulse and noiseperformance is recommended for all but themost demanding applications, which mayrequire the RD Series on page 2.9. Sizes 4"

    and larger are equipped with flangedconnections drilled to 125/150 lb ANSIspecifications. Smaller sizes are standardwith male threaded pipe nipples. Units sized4" and 5" are available in either flanged ormale pipe threads. Exterior surfaces receivea shop coat of rust-inhibitive primer andmay be finish painted in the field if desired.The SD Series is the basic end-in, end-out

    DrainP

    N

    N

    L H D

    K

    Y

    E

    K

    Y

    KB

    Y

    Acoustical packing is suitable for 325F

    P(Size)

    1122334568

    1012141618202224262830

    Part Number

    54-102-AA54-125-AA54-103-AA54-135-AA54-104-AA*54-105-AA*54-106-AA54-108-AA54-110-AA54-112-AA54-114-AA58-116-AA58-118-AA58-120-AA58-122-AA58-124-AA58-126-AA58-128-AA58-130-AA

    D

    888

    10101214182226303642424848545460

    L

    28333939455764728598

    111137150176195213233250276

    N

    3333333333333444444

    H

    22273333395158657891

    104130143167186204224241267

    K

    89

    1011121517212529303541474755556268

    141720263238404752626172768190

    SDY SDH SDS

    141720263238404752626172768190

    B

    89

    10121416182124252828313134

    E

    22345679

    11101211131214

    Min

    SDY

    Min

    799

    121315161820212324262829

    Max

    Max

    1623253037445065708793

    110117126139

    Min

    SDS

    Min

    79

    10121315161820212324262829

    Max

    Max

    9

    1215161824253640485060707181

    Min

    SDH

    Min

    3040434961698196

    104120138146157173190

    Max

    Max

    32434954657789

    113124147165182201216241

    Weight

    152530405080

    110190380550800

    1,2501,6001,9002,7003,0003,9004,4005,400

    Y

    Combination Chamber-Absorptive Type Discharge Silencers

    40

    50

    63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz

    Attenuation, dB

    Typical Attenuation Curve

    30

    10

    0

    20

    SD Series SDY Series(Low Side Inlet)

    SDH Series(High Side Inlet)

    SDS Series(Opposed Connection)

    configuration. A low side inlet is designatedthe SDY Series; high side inlet, SDH Series;and low opposed connection, SDS Series.The four types are fundamentally alike andperformance characteristics are identical.Mounting brackets and other options areavailablesee page 2.11.

    Sizes 1" and 1" use URB Series (page 2.7)

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    Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.

    *Specify -TT for male pipe threaded units.

    SpecificationsRD GroupCombination Chamber-Absorptive TypeDischarge Silencer

    The RD Series Discharge Silencer is a heavy-duty, all welded unit constructed of carbonsteel sheet and plate. It provides excellentpulse control and is equipped with anacoustically treated inlet for use on criticalPLV applications. Pulse control and noiseattenuation provided by the RD Series is theultimate and is necessary for only the most

    demanding installations. Sizes 4" and largerare equipped with flanged connections drilledto 125/150 lb ANSI specifications. Smallersizes are standard with male threaded pipenipples. Units sized 4" and 5" are available ineither flanged or male pipe threads. Exteriorsurfaces receive a shop coat of rust inhibitiveprimer and may be finish painted in the field

    DrainP

    N

    N

    L H D

    K

    Y

    E

    K

    Y

    KB

    Y

    Combination Chamber-Absorptive Type Discharge Silencers

    Acoustical packing is suitable for 325F

    40

    50

    63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz

    Attenuation, dB

    Typical Attenuation Curve

    30

    10

    0

    20

    RD Series RDY Series(Low Side Inlet)

    RDH Series(High Side Inlet)

    RDS Series(Opposed Connection)

    if desired. The RD Series is the basic end-in,end-out configuration. A low side inlet isdesignated the RDY Series; high side inlet,RDH Series; and low opposed connections,RDS Series. The four types are fundamentallyalike and performance is identical. Mountingbrackets and other options are availablesee page 2.11.

    P(Size)

    1122334568

    1012141618202224262830

    Part Number

    57-102-AA57-125-AA57-103-AA57-135-AA57-104-AA*57-105-AA*57-106-AA57-108-AA57-110-AA57-112-AA57-114-AA57-116-AA57-118-AA57-120-AA57-122-AA57-124-AA57-126-AA57-128-AA57-130-AA

    D

    8101012141618222630364248485454606672

    L

    3334465253657297

    122135161181188202204239259279304

    N

    3333333333333444444

    H

    2728404647596690

    115128154174181193195230250270295

    K

    9101011141620242835404447535966727878

    161822283442475254657281879395

    RDY RDH RDS

    141620263239455052637079859194

    B

    101112141618212427283131343740

    E

    445678

    101214131514161820

    RDY

    Min

    89

    10121415171921222425273132

    Max

    202630456066788995

    100100123130140158

    RDS

    Min

    89

    10121415171921222425273132

    Max

    141620263739465253585773768193

    RDH

    Min

    334346657991

    11012212913740

    159177192205

    Max

    39515679

    103114138155161172172207226242266

    Weight

    2535406080

    130160410600900

    1,4001,8002,5502,7503,3003,8505,0006,9508,100

    Sizes 1"1" use URB Series (page 2.7) or use U5 Series: (page 3.2)

    FIXED AT 6FIXED AT 7FIXED AT 7FIXED AT 8

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    SURS Series blower silencers are heavy-duty, all welded steel construction, suitablefor application as either and inlet ordischarge silencer on rotary positive. Theseunits are designed for blowers runningabove critical transition speed, andtherefore, no acoustic packing material isincluded in the design. Instead, these unitshave a specially designed, high-performance, three chamber system whichincorporates a diffuser on the blower side of

    the silencer units. The unit will provideexcellent pulse control and is designed forthe most demanding applications.

    Sizes smaller than four inches are equippedwith standard male threaded pipe nipples,while the 4 and larger units have flangedconnections drilled to 125/150 lb ANSIspecifications. As with other blower silencers,the SURS Series employs a high-heataluminum paint system.

    DrainP

    N

    N

    L H D

    K

    Y

    SURS Series SURSY Series(Low Side Inlet)

    The SURS is a basic end-in, end-outconfiguration. A low-side inlet model isdesignated as the SURSY Series; theSURSY is fundamentally identical to theSURS series in both dimension andattenuation performance. Both series aredesigned to operate at pressures to 15 psi.Mounting brackets, shell lagging and otheraccessories are available for both series ofblower silencers.

    Model

    SURS SURSY

    Part Model Part

    YP D L N H

    K Min. Max Weight

    SURS-2SURS-2.5SURS-3SURS-3.5SURS-4SURS-5SURS-6SURS-8SURS-10SURS-12SURS-14SURS-16SURS-18SURS-20

    55-A02-SS55-A25-SS55-A03-SS55-A35-SS55-A04-SS*55-A05-SS*55-A06-SS55-A08-SS55-A10-SS55-A12-SS55-A14-SS55-A16-SS55-A18-SS55-A20-SS

    SURSY-2SURSY-2.5SURSY-3SURSY-3.5SURSY-4SURSY-5SURSY-6SURSY-8SURSY-10SURSY-12SURSY-14SURSY-16SURSY-18SURSY-20

    55-B02-SS55-B25-SS55-B03-SS55-B35-SS55-B04-SS55-B05-SS55-B06-SS55-B08-SS55-B10-SS55-B12-SS55-B14-SS55-B16-SS55-B18-SS55-B20-SS

    22324568

    101214161820

    1212121414161826303636424848

    40404659597172

    111136138168181188214

    33333333333334

    34344053536566

    104129131161174181205

    999

    1010111216182121242728

    4455678

    10121416182022

    1313152020252541515063514856

    55556090

    100160200520810

    1,1301,4001,8002,5002,850

    SpecificationsSURS Group

    Chamber Type Multi-Use Silencer

    40

    50

    63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz

    Attenuation, dB

    Typical Attenuation Curve

    30

    10

    0

    20

    Combination Chamber Type Multi-Use Discharge Silencers

    *Specify -TT for male pipe threaded units.

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    Accessories andOptional FeaturesUCI, RIS, ICD IRB, IRD, SD, RD,and SURS Blower Silencers

    In addition to the standard accessoriesshown here, other special features such asspecial materials and finishes will be quotedon request. Contact Universal Silencer withyour specific requirements.

    Mounting BracketsMounting Brackets or legs are available for any of the silencers in this section.Saddle type brackets for horizontal mountand angle legs for vertical mount arestandard. See Spec. Sheet No. 1078. Special design brackets will be quoted withyour specifications.

    Inspection OpeningsInspection Openings with bolted andgasketed cover plates are available installedat the time the silencer is fabricated. Theyare designed to withstand the usual range ofpressure encountered with blowers. Oneinspection opening is usually installed ineach silencer chamber for cleaning orinspection. Standard sizes include:3" 4", 4" 6", 6" 8".

    Pressure Vessel ConstructionAll silencers shown in this catalog may befabricated in accordance with Div. 1,Section VIIIASME Code for UnfiredPressure Vessels. Dimensions are similarto standard models, but material types andthicknesses are selected to meet coderequirements. Prices are quoted onapplication to meet your pressure andtemperature conditions.

    Oversize FlangesFrequently the blower flange size is largerthan the required silencers connection.Rather than use a larger silencer, it isusually more economical to use an oversizereducing flange on the silencer. This is theconventional piping practice and may beused on either inlet or discharge silencers.Example: a 10" flange size silencer hasadequate capacity for a blower with a 12"discharge flange. A flange having a drillingpattern to match the 12" blower flange butwith a 10" bore to match the silencer nozzleis substituted on the silencer inlet.

    Two pipe sizes, (e.g. 10" to 14"), is therecommended maximum variation. Priceson request.

    Horizontal Vertical

  • CBF/CBFI SeriesCompact Blower

    Inlet Filter-Silencer

    Filter and silencer combined in one unit.The CBF and CBFI have the acousticcapabilities of the Universal Silencer RISSeries silencers and the filtrationperformance of CC series filters.

    Reduced cost, overall package size, weight,storage space, freight cost and damage.

    Approximately one third the size ofconventional blower silencer, with theadded benefit of excellent, high-efficiencyfiltration.

    Reduced overall package noise withoutfurther acoustic treatment.

    VersatileSuitable for inlet applications inconfined areas, outdoor or indoor, withoutcompromising acoustic or pressure dropperformance.

    500 1K 1.5K 2K 2.5K 3K 3.5K 4K 4.5K 5K 5.5K0

    1

    2

    3

    4

    5

    6

    7

    Velocity, ft/min

    P, inches of H

    2 O

    Pressure Drop Curves

    70F200F300F

    L

    WD

    H

    DP

    K

    Y

    " NPTpressure tap

    Removable weatherhoodfor filter element access

    Y

    P

    H

    L

    K

    D

    WDRemovable plate for filter element access

    " NPTpressure tap

    CBF Series (outdoor use) CBFI Series (indoor use)

    P (nom.)

    CBF/CBFI

    2234568

    1012

    D

    88

    12121616243034

    89

    10151723243539

    44578

    11131719

    7799

    1111151820

    120175275500750

    1,1002,2003,0004,300

    34-702-AA34-725-AA34-703-AA34-704-AA34-705-AA34-706-AA34-708-AA34-710-AA34-712-AA

    101016162020303640

    131417

    21263239

    4654

    2025506085

    100200305385

    34-G02-AA34-G25-AA34-G03-AA34-G04-AA34-G05-AA34-G06-AA34-G08-AA34-G10-AA34-G12-AA

    66

    10101212121824

    121416202531394553

    2025506085

    100185295370

    H Y K CFM CAP Part

    CBF

    WD L Weight Part

    CBFI

    B L1 Weight

    Models, Dimensions, Weights and Elements

    Notes: 1. Non-ASME Code construction suitable for 15" Hg vacuum.2. Weights are approximate and do no include the weight of the filter element.

    40

    50

    63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz

    Attenuation, dB

    Typical Attenuation Curve

    30

    10

    0

    20

    81-0471*81-0471*81-106381-106381-047581-047581-116381-116381-1164

    81-1203*81-1203*81-120581-120581-120781-120781-120981-120981-1210

    81-1036*81-1036*81-103881-103881-104081-104081-120081-120081-1201

    Paper

    2234568

    1012

    P (nom.)Element Part Number

    Felt Wire

    *Pair of elements required (stacked).

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    2.12

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    CB SeriesCompact Blower Silencer

    Part Number P (nom.) D L H Y K Weight

    56-702-AA56-725-AA56-703-AA56-704-AA56-705-AA56-706-AA56-708-AA56-710-AA56-712-AA

    2234568

    1012

    88

    12121616243034

    111213182026313943

    89

    10151723273539

    44578

    11131719

    7799

    1111151820

    152535457085

    170275355

    120187270480750

    1,0801,9203,0004,320

    Model

    CB-2CB-2CB-3CB-4CB-5CB-6CB-8CB-10CB-12

    CFM CAP

    Compact Blower Silencers

    Y

    PH

    L

    P

    D

    K

    500 1K 1.5K 2K 2.5K 3K 3.5K 4K 4.5K 5K 5.5K0

    1

    2

    3

    4

    5

    6

    7

    Velocity, ft/min

    P, inches of H

    2 O

    Pressure Drop Curves

    40

    50

    63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz

    Attenuation, dB

    Typical Attenuation Curve

    30

    10

    0

    20

    70F200F300F

    This extremely compact blower silencerworks as either an inlet or dischargesilencer on rotary positive blowers. It isabout one-third the size of a standardsilencer, and reduces overall package size,cost, weight and storage space. The unitsinternal pack material is suitable fortemperatures up to 325 degrees. The unit is

    operable in conditions up to 15 psig.Flanged or threaded connections areavailable. Exterior surfaces receive a shopcoat of rust inhibitive primer.

    12

    34

    56

    78

    910

  • UNI-BASEUltra-Wide Base

    Plates/ComponentsRotary Positive Blowers

    These wide base plate productsaccommodate a variety of blower packagedesigns. The UNI-BASE package and theUSI-BASE base plate use the same basicbase plate and discharge silencer. The UNI-BASE package includes the UniversalSilencer model URBN high-side inlet silencerand CCF inlet air filter, while the UNI-BASE

    base plate is only the basic plate and theURBY discharge silencer. Please see page2.7 for performance and sizing informationfor the URBY series silencers, page 2.15 forinformation on the URBN series silencers,and page 8.9 for performance data, weightsand dimensions of CCF filters.

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    2.14

    UNI-BASE Package

    UNI-BASE Base Plate Only

    CCF (see page 8.9)

    URBN (see page 2.15)

    URBY (see page 2.7)

    URBY (see page 2.7)

    Size UNI-BASE Package

    2"2"3"4"5"6"

    80-187380-187480-187580-187680-187780-1878

    55-202-ABP55-225-ABP55-203-ABP55-204-ABP55-205-ABP55-206-ABP

    55-502-AA55-525-AA55-503-AA55-504-AA55-505-AA55-506-AA

    55-202-AA55-225-AA55-203-AA55-204-AA55-205-AA55-206-AA

    34-L02-TT*34-L25-TT*34-L03-TT*34-L04-TT*34-L05-TT*34-L06-TT*

    Base Plate Only URBN Only URBY Only CCF Only

    UNI-BASE Base Plates/Components Part Numbers

  • UNI-BASEUltra-Wide BasePlates/ComponentsRotary Positive Blowers

    P1/P2 (nom.) D1 H1 K1 Y1 Y2 Approx. Weight

    223456

    81010141618

    272840476066

    788

    101112

    677668

    344567

    25355080

    140170

    URBN Silencers

    CCF Silencers (please see page 8.9)

    P (nom.) A B C CD D2 E FS

    2

    3456

    394455566666

    1

    4

    2020.883137.3143.3852

    10.5611.1312.0015.381818

    81010141618

    6.316.5677.88

    1310.38

    131415.1316.441415.13

    23.3827.38

    293335

    35

    161717242326

    56689

    10

    788

    101112

    303143506269

    3446

    1112

    212526293030

    677

    111212

    125170270355500645

    G H2 J K2 L Q (Dia.) S YApprox.Weight

    UNI-BASE Base Plate (w/URBY)

    Dimensions and Weights

    Notes: 1. Sizes 2"3" URBY discharge silencers are shipped standard with male pipe threaded connections. 4" and 5" URBY discharge silencers are shipped standard with malepipe threaded discharge connections and plain pipe blower connections. 6" URBY discharge silencers are shipped standard with flanged discharge connection drilledto 125/152 lb. ANSI specifications and plain pipe blower connections.

    2. Sizes 2"3" URBY discharge silencers have a 2" NPT relief valve coupling and plug. Sizes 4"6" URBY discharge silencers have a 3" NPT relief valve coupling and plug.3. UNI-BASE base plate kit sizes 2"4" require gussets.

    Notes: 1. Sizes 2"4" URBN inlet silencers are shipped with male pipe threaded inlets and plain pipe outlets. Sizes 5" and 6" URBN inlet silencers are shipped standard withflanged inlet connections drilled to 125/150 lb ANSI specifications and plain pipe outlets.

    Blow

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