July 2000 Bulletin 80.

1:6010

Type 6010, 6011, and Whisper Diskt

Inline Diffusers
Because valves can be substantial noise contributors
when controlling industrial processes, Fisher Controls
offers a complete line of diffusers to provide optimum
noise attenuation. A diffuser is a pressure-reducing
device that is installed downstream from the control
valve. The total pressure drop of the system is divided
across the valve and a diffuser. This enables the valve
to operate at a lower pressure ratio and greatly reduce
the control valve noise level generated by steam, gas,
or vapor flow.
W1162–2/IL W4888/IL
Inline Diffusers
TYPE 6010 WHISPER DISKt
The Types 6010, 6011 and Whisper Diskt (figure 1)
in-line diffusers are installed downstream of any con-
trol valve. Flexibility is key, whereas several installa-
tion methods are available, based on design of the
diffusers. They are used in steam, gas, or vapor flow
applications to achieve minimum noise generation.

Features W1155–2/IL
TYPE 6011
D Versatility— The diffuser concept is used in sev-
eral unique versions, providing optimum solutions for Figure 1. Inline Diffusers
various applications. The diffuser need not be installed
adjacent to the control valve. the generation of potentially damaging noise and
vibration.
D Noise Attenuation— A properly selected diffus-
er-valve combination can result in up to 40 dBA noise D Lower Life-Cycle Cost— Two types of diffusers
reduction. are available: the flat diffuser and the tube-and-shell
diffuser for higher capacities. Both are ruggedly built
D Total Control— A diffuser-valve combination static devices requiring no maintenance after installa-
retains the pressure/flow control associated with a tion. These features combine to offer maximum noise
standard control valve. Just as important, it controls control at a minimum investment.

D100194X012
Bulletin 80.1:6010
Specifications
Available Configurations Whisper Disk— See table 4 for raised-face
Type 6010— Inline diffuser (with integral outlet flanges; other sizes and connections are available.
head) Consult your Fisher Controls sales office
Type 6011— Inline diffuser (insert type)
Whisper Disk— Inline diffuser (flat plate)
Materials
Sizes and End Connections See table 1
Type 6010— Both ends buttwelding end or both
ends flanged; any combination is optional. Sizes
and schedules are available to meet your applica- Weights & Dimensions(1)
tion (see table 2) Type 6010— See figure 2 and table 2
Type 6011— See figure 3 and table 3
Note Whisper Disk— See figure 4
Inline diffusers are not hydrostatically
tested. Sizing
Type 6011— No bolted connections; designed to Types 6010 and 6011— See Fisher Controls
be retained between mating flanges. Sizes are Catalog 12, Section 3
available to meet your application (see table 3) Whisper Disk— See table 5
1. Your Fisher Controls sales office can determine actual weights and lengths after the diffuser has been sized for pressure and noise conditions.

Table 1. Construction Materials

DIFFUSER FLANGE DIFFUSER HEAD TEMPERATURE LIMITS
MATERIAL DIFFUSER TUBE
OR WHISPER DISK CAP _C _F
Steel(1) Steel (SA-105) Grade B (SA-106) Grade WPB (SA-234) –29 to 427 –20 to 800
Alloy Steel(2) (1-1/4 Cr-1/2 MO) Grade F11 (SA-182) Grade P11 (SA-335) Grade WP11 (SA-234) -29 to 537 –20 to 1000
Alloy Steel(3) (2-1/4 Cr-1 MO) Grade F22 (SA-182) Grade P22 (SA-335) Grade WP22 (SA-234) –29 to 566 –20 to 1050
S31600 (316 SST) Grade F316 (SA-182) Grade TP316 (SA-312) Grade WP316H (SA-403) –198 to 593 –325 to 1100
S30400 (304 SST) Grade F304 (SA-182) Grade TP304 (SA-312) Grade WP304H (SA-403) –198 to 593 –325 to 1100
Nickel Alloy (Alloy 400) Grade 400 (B564) Grade 400 (B165) Grade WPNC (B366) –198 to 427 –325 to 800
1. Sour gas diffuser assembly can be heat treated to 22 RHC (Rockwell C) maximum hardness as required by NACE MR0175.
2. Wrought equivalent to WC6.
3. Wrought equivalent to WC9.

Ordering Information
Contact your Fisher Controls sales office or refer to
OEDII to order a diffuser. The Diffuser Data Sheet is
also available on FishWEB. All diffusers are designed
by Fisher Controls International, Inc., in Marshalltown,
Iowa, 50158, USA.

2
 Bulletin 80.1:010
Type 6010 Diffuser

Typical Type 6010 Diffuser Dimensions(1)

APPROXI-
FLANGED BUTTWELD
DIFFUSER Do(3) MATE
L L2
SIZE((2)) WEIGHT(4)
mm Inches mm Inches mm Inches kg lb
1x3 152 6.00 84 3.31 76 3 1.3 2.75
1-1/2 x 3 165 6.50 89 3.50 76 3 1.6 3.50
2x4 203 8.00 122 4.81 102 4 2.5 5.50
2x6 229 9.00 148 5.81 152 6 4.3 9.50
2-1/2 x 6 229 9.00 141 5.56 152 6 5.2 11.50
3x6 229 9.00 138 5.44 152 6 7.8 17
3x8 241 9.50 151 5.94 203 8 10 23
4x8 279 11.00 170 6.69 203 8 14 31
6 x 12 330 13.00 205 8.06 305 12 33 72
8 x 16 381 15.00 240 9.44 406 16 48 105
10 x 14 356 14.00 195 7.69 356 14 73 160
10 x 16 406 16.00 246 9.69 406 16 77 170
30A8680–D
10 x 20 457 18.00 297 11.69 508 20 93 205
A2137–1A/IL TYPE 6010 12 x 24 483 19.00 319 12.56 610 24 122 270
14 x 28 483 19.00 310 12.19 711 28 249 550
16 x 32 483 19.00 297 11.69 813 32 374 824
18 x 36 508 20.00 316 12.44 914 36 443 976
20 x 36 508 20.00 310 12.19 914 36 536 1181
24 x 36 533 21.00 322 12.69 914 36 714 1573
1. Dimensions may vary to meet specific sound attenuation or piping requirements.
2. Inlet x outlet nominal pipe sizes.
3. Dimensions are nominal pipe size.
4. Weights do not include optional flanges.

Figure 2. Type 6010 Diffuser Dimensions

Table 2. Minimum Outlet Head Size for Type 6010 Diffusers(1)

INLET TUBE NOMINAL MINIMUM OUTLET HEAD MAXIMUM HEAD
MAXIMUM HEAD(2) WALL THICKNESS
PIPE SIZE, (NOMINAL PIPE SIZE),
SCHEDULE
INCHES INCHES mm Inches
1 2 80 5.5 0.218
1 2-1/2 80 7.0 0.276
1-1/2 3 80 7.6 0.300
2 4 XXS 17.1 0.674
2-1/2 4 80 8.6 0.337
3 5 80 9.5 0.375
4 6 80 10.9 0.432
6 10 160 28.6 1.125
8 12 160 33.3 1.312
10 14 XS 12.7 0.500
12 18 80 23.8 0.938
14 20 80 26.2 1.031
16 20 STD only 9.5 0.375
18 24 40 17.5 0.688
20 26 20 12.7 0.500
24 30 30 15.9 0.625
1. This chart may be used to determine physical size limitations. It is not intended to be used as a guide or substitute for outlet velocity calculations, or outlet sizing.
2. Larger head sizes are available on all inlet sizes.

3
Bulletin 80.1:6010
Type 6011 Diffuser

Typical Type 6011 Diffuser Dimensions(1)

DIFFUSER MAXIMUM MAXIMUM APPROXI-
SIZE(2) T TUBE SIZE MATE
L
(MATING DT(3,4) WEIGHT
FLANGE) mm Inches mm Inches mm Inches kg lb
2 483 19 16 0.63 32 1.25 2.7 6
3 635 25 19 0.75 64 2.50 9 20
4 711 28 22 0.88 76 3 14 30
6 1295 51 28 1.12 127 5 41 90
8 1473 58 32 1.25 152 6 68 150
10 1778 70 38 1.50 203 8 113 250
12 2134 84 44 1.75 254 10 159 350
14 2184 86 44 1.75 254 10 181 400
16 2286 90 51 2.00 356 14 268 590
18 2286 90 51 2.00 356 14 340 750
30A8679–E
A2137–1B/IL TYPE 6011 20 2286 90 51 2.00 406 16 397 875
24 2286 90 51 2.00 508 20 544 1200
30 2286 90 70 2.75 610 24 635 1400
1. Dimensions may vary to meet specific sound attenuation or piping requirements.
2. Specify mating flange size for diffuser size.
3. Heavy schedule mating flange may require smaller tube size.
4. Smaller tube sizes available for increased annular area.

Figure 3. Type 6011 Diffuser Dimensions

Table 3. Maximum Tube Size for Type 6011 Diffusers(1)

MATING LINE
MAXIMUM TYPE 6011
Maximum Allowable
Mating Flange Line Size Maximum Schedule TUBE SIZE NPS
Wall Thickness
Inches Allowed (INCHES)
mm Inches
2 STD only 3.9 0.154 1-1/2
2 XS 5.5 0.218 1-1/4
3 STD only 5.4 0.216 2-1/2
3 160 11.1 0.438 2
4 80 8.6 0.337 3
6 80 11.0 0.432 5
6 160 18.3 0.719 4
8 120 18.3 0.719 6
10 100 18.3 0.719 8
12 160 33.3 1.312 8
12 60 14.3 0.562 10
14 80 19.1 0.750 10
16 80 21.4 0.844 12
18 80 23.8 0.938 14
20 60 20.6 0.812 16
24 XS 12.7 0.500 20
30 XS 12.7 0.500 24
1. This chart may be used to determine physical size limitations. It is not intended to be used as a guide or substitute for outlet velocity calculations, or outlet sizing.

4
 Bulletin 80.1:010
Whisper Diskt Diffuser
Table 4. Available Size/Pressure Class
for Whisper Disk Diffusers
NOMINAL PIPE ANSI CLASS(1)
SIZE, INCHES 150 300 400 600 900 1500 2500
2
2-1/2
3
4
6
8
10
12
14-24
1. Ratings are for raised face flanges. Flange ratings higher than those listed may be
available. Consult your Fisher Controls sales office for higher flange ratings, other
sizes, and RTJ (ring-type joint) facing.

Table 5. Whisper Disk Maximum Allowable Cg Per Disk Size and Pressure Ratio(1) (Pressure Ratio of Disk, Not System)
nP/P1 (psia) nP/P1 (psia) nP/P1 (psia) nP/P1 (psia)
Size, Inches
Maximum of 0.60 Maximum of 0.75 Maximum of 0.85 Maximum of 0.99
2 383 164 73 25
2-1/2 610 280 140 65
3 1030 935 400 340
4 2650 985 900 600
6 5300 3340 2064 1000
8 9000 5500 2840 2300
10 14,000 9000 4680 3500
12 20,100 13,500 6890 5500
14 24,900 14,000 8510 6550
16 25,000 18,200 11,400 9080
18 25,000 23,500 14,800 9600
20 25,000 25,000 21,600 12,100
24 25,000 25,000 25,000 18.000
1. Above Cg values based on standard weight pipe upstream and downstream of disk diffuser. For heavier schedule or heavier flange maximum Cg values, consult your Fisher
Controls sales office.

5
Bulletin 80.1:6010

T, MILLIMETERS T, INCHES
NOMINAL
PIPE SIZE, ANSI Class ANSI Class
INCHES(1) 150 300 400 600 900 1500 150 300 400 600 900 1500
2 19 22 32 32 44 44 0.75 0.88 1.25 1.25 1.75 1.75
2-1/2 22 25 35 35 48 48 0.88 1.00 1.38 1.38 1.88 1.88
3 24 28 38 38 44 54 0.94 1.12 1.50 1.50 1.75 2.12
4 24 32 41 44 51 54 0.94 1.25 1.62 1.75 2.00 2.12
6 25 37 48 54 --- --- 1.00 1.44 1.88 2.12 --- ---
8 28 41 54 --- --- --- 1.12 1.62 2.12 --- --- ---
10 30 48 --- --- --- --- 1.19 1.88 --- --- --- ---
12 32 51 --- --- --- --- 1.25 2.00 --- --- --- ---
14 35 --- --- --- --- --- 1.38 --- --- --- --- ---
16 37 --- --- --- --- --- 1.44 --- --- --- --- ---
18 40 --- --- --- --- --- 1.56 --- --- --- --- ---
20 43 --- --- --- --- --- 1.69 --- --- --- --- ---
24 48 --- --- --- --- --- 1.88 --- --- --- --- ---
1. For sizes and ratings not shown, contact your Fisher Controls sales office.

24B0372–A
A6140/IL

Figure 4. Thickness Dimension T for Whisper Diskt Diffusers

Whisper Disk, Fisher and Fisher-Rosemount are marks owned by Fisher Controls International, Inc. or Fisher-Rosemount Systems, Inc.
All other marks are the property of their respective owners.
EFisher Controls International, Inc. 1987, 2000; All Rights Reserved

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express
or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.

For information, contact Fisher Controls:

Marshalltown, Iowa 50158 USA
Cernay 68700 France
Sao Paulo 05424 Brazil
Singapore 128461

6
Printed in U.S.A.