general information - blower silencers€¦ · title: general information - blower silencers...
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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 gear—equal 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 140–145 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 silencer—the simple,straight-through packed type—is 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 noise—such as that radiatedby pipe wall and silencer shell—may 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
22¹⁄₂
345678
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 = V
4005
2c
��P � � � c � �V
4005P
14.7530T
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 its“inlet 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 restrictioncoefficient—empirical constant(see Table 4)
P = discharge pressure, PSIA(operating pressure in PSIG + 14.7)
T = discharge temperature, ˚Rabsolute (operating temperature in˚F + 460)
* To calculate velocity through silencer, divide flow inACFM by cross-sectional area of silencer inlet diameterin square feet.
2
Size
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
1012141618202224262830
Est Temp.
3070
120190270370480750
1,0801,9203,0004,3005,9007,7009,700
12,00014,50017,30020,30023,50027,000
70˚F
3580
140220320430560880
1,2602,2503,5205,0706,8909,000
11,40014,00017,00020,20023,80027,60031,700115˚F
4085
150235335455600935
1,3402,3903,7305,3707,3109,550
12,10014,90018,10021,50025,20029,30033,600140˚F
4090
160245355480630985
1,4102,5103,9305,6607,700
10,00012,70015,70019,00022,60026,60030,80035,400165˚F
4095
165255370505660
1,0301,4802,6304,1105,9208,060
10,50013,30016,40019,90023,70027,80032,20037,000190˚F
45105185285415560735
1,1501,6502,9404,5906,6008,990
11,80014,90018,40022,20026,40031,00036,00041,300240˚F
Silencer Capacity3
Inlet Silencer4 PSIG
Discharge Silencer
Capacity (Inlet CFM 14.7 PSIA at 70˚F)
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 available—see 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
45¹⁄₂
6980¹⁄₂
91¹⁄₂
103¹⁄₂
114126138149161173
250360550
9501,2001,3501,9502,5002,7503,4004,650
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
101214161820
24262830
61748799
113126140153167179193
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
54678092
106119131144158170184197
14¹⁄₂
16¹⁄₂
18¹⁄₂
21¹⁄₂
24¹⁄₂
25¹⁄₂
28¹⁄₂
31¹⁄₂
31¹⁄₂
34¹⁄₂
37¹⁄₂
911
13¹⁄₂
15¹⁄₂
17¹⁄₂
1920¹⁄₂
22¹⁄₂
23¹⁄₂
25¹⁄₂
27¹⁄₂
2127
404855¹⁄₂
60¹⁄₂
66¹⁄₂
7285
9587
28¹⁄₂
34¹⁄₂
47¹⁄₂
53¹⁄₂
59¹⁄₂
67758384
10091
206 4¹⁄₂66
53-122-AA22
650
57413412¹⁄₂18¹⁄₂
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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
28¹⁄₂
333939¹⁄₂
4557¹⁄₂
64728598
111113126140153167179193206
33333333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
22¹⁄₂
273333¹⁄₂
3951¹⁄₂
58657891
104106119131144158170184197
8¹⁄₂
9101112¹⁄₂
15¹⁄₂
1721¹⁄₂
25¹⁄₂
29¹⁄₂
3035¹⁄₂
414746¹⁄₂
5455¹⁄₂
6166¹⁄₂
————
14¹⁄₂
17¹⁄₂
2026¹⁄₂
32¹⁄₂
384049¹⁄₂
57¹⁄₂
62¹⁄₂
65¹⁄₂
75¹⁄₂
7684¹⁄₂
93¹⁄₂
————
2¹⁄₄
2³⁄₄
3¹⁄₄
4567¹⁄₂
00000000
FIXED AT 6
2¹⁄₂" THRU 3¹⁄₂"AVAILABLE ON
SPECIAL ORDER
FIXED AT 7FIXED AT 7FIXED AT 8
7¹⁄₂
99
1213¹⁄₂
1516¹⁄₂
18¹⁄₂
20¹⁄₂
2223¹⁄₂
25¹⁄₂
25¹⁄₂
29¹⁄₂
30¹⁄₂
16¹⁄₂
2325¹⁄₂
30¹⁄₂
3744505158¹⁄₂
63¹⁄₂
69¹⁄₂
75879198
30¹⁄₂
4043¹⁄₂
49¹⁄₂
61¹⁄₂
698156¹⁄₂
62¹⁄₂
7078868695
103
P(Size)
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
1012141618202224262830
RISY RISH
KE
Min Max
RISY RISH
Y
Min Max
Weight
32¹⁄₂
43¹⁄₂
495465¹⁄₂
7789¹⁄₂
88¹⁄₂
100¹⁄₂
111123135147157170
252530405080
110190380550800
1,0501,3501,5002,1002,7003,0503,8505,150
Combination Chamber-Absorptive Type Inlet Silencers
Sizes 1"–1¹⁄₂" 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 available—see 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
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
54678092
106119131144158170184197
14¹⁄₂
16¹⁄₂
18¹⁄₂
18¹⁄₂
21¹⁄₂
24¹⁄₂
25¹⁄₂
28¹⁄₂
31¹⁄₂
31¹⁄₂
34¹⁄₂
37¹⁄₂
P(Size)
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
1012141618202224262830
Min
91112¹⁄₂
13¹⁄₂
15¹⁄₂
17¹⁄₂
1920¹⁄₂
22¹⁄₂
23¹⁄₂
25¹⁄₂
27¹⁄₂
Max
Y
212734404855¹⁄₂
60¹⁄₂
66¹⁄₂
72858795
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 areavailable—see 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
4¹⁄₂
6¹⁄₂
8101012141618222630364248485454606672
21243334465253657297
122135161181188202204239259279304
2233333333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
17202728404647596690
115128154174181193195230250270295
——7889
10111214¹⁄₂
16¹⁄₂
18¹⁄₂
21¹⁄₂
24¹⁄₂
27¹⁄₂
28¹⁄₂
31¹⁄₂
31¹⁄₂
34¹⁄₂
37¹⁄₂
40¹⁄₂
——
66¹⁄₂
89
1112¹⁄₂
14¹⁄₂
16¹⁄₂
18¹⁄₂
19¹⁄₂
21¹⁄₂
22¹⁄₂
252729
——
2229324863¹⁄₂
698192¹⁄₂
98103103126132144161
—————————82
106117¹⁄₂
141158¹⁄₂
164¹⁄₂
175¹⁄₂
175¹⁄₂
210¹⁄₂
228246272
—————————
6276¹⁄₂
88107119¹⁄₂
126¹⁄₂
134137156¹⁄₂
175188203
——————89
10121415¹⁄₂
17¹⁄₂
19¹⁄₂
21¹⁄₂
22¹⁄₂
24¹⁄₂
25¹⁄₂
273132
K
Min
URBY, URDY URDH URDS
Y
Max Min Max Min Max
Weight
——————
1619222940¹⁄₂
424955¹⁄₂
56¹⁄₂
616076¹⁄₂
788596
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)
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
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 areavailable—see 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 325˚F
P(Size)
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
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
28¹⁄₂
333939¹⁄₂
4557¹⁄₂
64728598
111137150176195213233250276
N
33333333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
H
22¹⁄₂
273333¹⁄₂
3951¹⁄₂
58657891
104130143167186204224241267
K
8¹⁄₂
9101112¹⁄₂
15¹⁄₂
1721¹⁄₂
25¹⁄₂
29¹⁄₂
3035¹⁄₂
41474755¹⁄₂
556268
————
14¹⁄₂
17¹⁄₂
2026¹⁄₂
32¹⁄₂
38404752626172768190
SDY SDH SDS
————
14¹⁄₂
17¹⁄₂
2026¹⁄₂
32¹⁄₂
38404752626172768190
B
————89
1012¹⁄₂
14¹⁄₂
16¹⁄₂
18¹⁄₂
21¹⁄₂
24¹⁄₂
25¹⁄₂
28¹⁄₂
28¹⁄₂
31¹⁄₂
31¹⁄₂
34¹⁄₂
E
————2¹⁄₄
2³⁄₄
3¹⁄₄
4567¹⁄₂
9¹⁄₂
11¹⁄₂
10¹⁄₂
12¹⁄₂
11¹⁄₂
13¹⁄₂
12¹⁄₂
14¹⁄₂
Min
SDY
Min
————7¹⁄₂
99
1213¹⁄₂
1516¹⁄₂
18¹⁄₂
20¹⁄₂
21¹⁄₂
23¹⁄₂
24¹⁄₂
2628¹⁄₂
29¹⁄₂
Max
Max
————16¹⁄₂
2325¹⁄₂
30¹⁄₂
3744506570¹⁄₂
87¹⁄₂
93¹⁄₂
110¹⁄₂
117126¹⁄₂
139
Min
SDS
Min
————7¹⁄₂
9101213¹⁄₂
1516¹⁄₂
18¹⁄₂
20¹⁄₂
21¹⁄₂
23¹⁄₂
24¹⁄₂
2628¹⁄₂
29¹⁄₂
Max
Max
————9¹⁄₂
12¹⁄₂
15¹⁄₂
16¹⁄₂
1824253640¹⁄₂
48¹⁄₂
50¹⁄₂
60¹⁄₂
7071¹⁄₂
81
Min
SDH
Min
————30¹⁄₂
4043¹⁄₂
49¹⁄₂
61¹⁄₂
698196
104¹⁄₂
120¹⁄₂
138¹⁄₂
146¹⁄₂
157¹⁄₂
173¹⁄₂
190
Max
Max
————32¹⁄₂
43¹⁄₂
495465¹⁄₂
7789¹⁄₂
113¹⁄₂
124¹⁄₂
147¹⁄₂
165¹⁄₂
182¹⁄₂
201¹⁄₂
216¹⁄₂
241¹⁄₂
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 areavailable—see page 2.11.
Sizes 1" and 1¹⁄₂" use URB Series (page 2.7)
Y
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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 325˚F
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 available—see page 2.11.
P(Size)
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
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
33333333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
H
2728404647596690
115128154174181193195230250270295
K
910101114¹⁄₂
16¹⁄₂
20¹⁄₂
24¹⁄₂
28¹⁄₂
3540¹⁄₂
44¹⁄₂
4753¹⁄₂
59¹⁄₂
66727878
————
161822¹⁄₂
28¹⁄₂
344247¹⁄₂
52¹⁄₂
54657281¹⁄₂
8793¹⁄₂
95¹⁄₂
RDY RDH RDS
————
14¹⁄₂
16¹⁄₂
20¹⁄₂
263239¹⁄₂
45¹⁄₂
5052¹⁄₂
63¹⁄₂
7079¹⁄₂
859194
B
————
10111214¹⁄₂
16¹⁄₂
18¹⁄₂
21¹⁄₂
24¹⁄₂
27¹⁄₂
28¹⁄₂
31¹⁄₂
31¹⁄₂
34¹⁄₂
37¹⁄₂
40¹⁄₂
E
————44¹⁄₂
5678
10¹⁄₂
12¹⁄₂
14¹⁄₂
13¹⁄₂
15¹⁄₂
14¹⁄₂
16¹⁄₂
18¹⁄₂
20¹⁄₂
RDY
Min
89
10121415¹⁄₂
17¹⁄₂
19¹⁄₂
21¹⁄₂
22¹⁄₂
24¹⁄₂
25¹⁄₂
273132
Max
2026¹⁄₂
304560¹⁄₂
667889¹⁄₂
95100100123130140158
RDS
Min
————89
10121415¹⁄₂
17¹⁄₂
19¹⁄₂
21¹⁄₂
22¹⁄₂
24¹⁄₂
25¹⁄₂
273132
Max
————
1416¹⁄₂
202637¹⁄₂
394652¹⁄₂
53¹⁄₂
585773¹⁄₂
768193
RDH
Min
————3343¹⁄₂
466579¹⁄₂
91110122¹⁄₂
129¹⁄₂
13740
159¹⁄₂
177192205
Max
————39515679
103114¹⁄₂
138155¹⁄₂
161¹⁄₂
172¹⁄₂
172¹⁄₂
207¹⁄₂
226242266
Weight
2535406080
130160410600900
1,4001,8002,5502,7503,3003,8505,0006,9508,100
Sizes 1"–1¹⁄₂" 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
22¹⁄₂
32¹⁄₂
4568
101214161820
1212121414161826303636424848
40404659597172
111136138168181188214
33333333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4
34344053536566
104129131161174181205
999
1010111216¹⁄₂
18¹⁄₂
21¹⁄₂
21¹⁄₂
24¹⁄₂
27¹⁄₂
28¹⁄₂
4¹⁄₂
4¹⁄₂
55¹⁄₂
678
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 VIII—ASME 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 silencer’s 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.
Versatile—Suitable 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
70°F200°F300°F
L
WD
H
DP
K
Y
¹⁄₈" NPTpressure tap
Removable weatherhoodfor filter element access
Y
P
H
L
K
D
WDRemovable plate for filter element access
¹⁄₈" NPTpressure tap
CBF Series (outdoor use) CBFI Series (indoor use)
P (nom.)
CBF/CBFI
22¹⁄₂
34568
1012
D
88
12121616243034
89
1015172324¹⁄₂
35¹⁄₂
39¹⁄₂
44³⁄₄
5¹⁄₄
7¹⁄₂
8¹⁄₂
11¹⁄₂
13³⁄₄
17³⁄₄
19³⁄₄
7799
111115¹⁄₂
18¹⁄₂
20¹⁄₂
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
13¹⁄₄
14³⁄₄
17
21¹⁄₄
263239
46¹⁄₂
54¹⁄₂
2025506085
100200305385
34-G02-AA34-G25-AA34-G03-AA34-G04-AA34-G05-AA34-G06-AA34-G08-AA34-G10-AA34-G12-AA
6¹⁄₂
6¹⁄₂
10101212121824
12³⁄₄
14¹⁄₄
16¹⁄₂
20³⁄₄
25¹⁄₄
31¹⁄₄
39¹⁄₄
45³⁄₄
53³⁄₄
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
22¹⁄₂
34568
1012
P (nom.)Element Part Number
Felt Wire
*Pair of elements required (stacked).
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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
22¹⁄₂
34568
1012
88
12121616243034
1112¹⁄₂
13¹⁄₂
182026313943
89¹⁄₂
10¹⁄₂
15172327¹⁄₂
35¹⁄₂
39¹⁄₂
44³⁄₄
5¹⁄₄
7¹⁄₂
8¹⁄₂
11¹⁄₂
13³⁄₄
17³⁄₄
19³⁄₄
7799
111115¹⁄₂
18¹⁄₂
20¹⁄₂
152535457085
170275355
120187270480750
1,0801,9203,0004,320
Model
CB-2CB-2¹⁄₂
CB-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
70°F200°F300°F
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 unit’sinternal 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"2¹⁄₂"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
22¹⁄₂
3456
81010141618
272840476066
788
101112
677668
3¹⁄₂
4¹⁄₂
4¹⁄₂
5¹⁄₂
6¹⁄₂
7¹⁄₂
25355080
140170
URBN Silencers
CCF Silencers (please see page 8.9)
P (nom.) A B C CD D2 E FS
2
3456
3944¹⁄₂
55¹⁄₂
566666
1¹⁄₂
¹⁄₂
4———
20³⁄₄
20.8831¹⁄₂
37.3143.3852
10.5611.1312.0015.3818¹⁄₄
18¹⁄₄
81010141618
6.316.567¹⁄₂
7.8813³⁄₄
10.38
1314¹⁄₄
15.1316.4414³⁄₄
15.13
23.3827.38
29³⁄₄
3335
35¹⁄₄
16171724¹⁄₂
23¹⁄₂
26¹⁄₂
56689
10¹⁄₄
788
101112
3031435062¹⁄₂
69
3¹⁄₂
44³⁄₄
61112
212526¹⁄₄
29³⁄₄
30¹⁄₂
30¹⁄₂
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.
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45
67
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