ANSI / ASME B16.5 Reducing Flange

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Kaizen Steel Industries specializes in the manufacturing, stocking, supplying, and exporting of ANSI B16.5 Reducing Flanges. Also known as reducer flanges, these are used to connect pipes of different sizes without needing a separate reducer. For reducing flanges, the flange’s density should match that of the larger radius.

Reducing flanges come in various types, including blind, slip-on, threaded, and weld neck flanges. They are available in all pressure classes and provide a reliable option for connecting pipes of different sizes. The end preparations for reducing flanges include butt weld, socket weld, threaded, and slip-on, with sizes ranging from 1/2” to 24” nominal size and pressure classes from 150# to 2500#. They can have Raised Face (RF), Flat Face, or Ring Type Joint (RTJ) facing, among others.

Reducing flanges are beneficial because they are easier to bolt up compared to non-reducing flanges. They are ideal for connecting flanges of different sizes and are available in various types and pressures. These flanges are fixed by welding or using connecting pieces of equal range, offering a straightforward and cost-effective way to join flanges of different sizes.

We supply and export a wide range of reducing flanges, including ASME B16.5 SS Reducing Flanges, Reducing Copper Flanges, Reducing Threaded Flanges, Reducing Blind Flanges, Eccentric Reducing Flanges, Reducing Flat Face Flanges, Grooved Reducing Flanges, Reducing Hub Flanges, Reducing Lap Joint Flanges, NPT Reducing Slip-On Flanges, and Reducing Socket Weld Flanges.

Reducing Flanges Specification

ASME B16.5 Reducing Flange Size Chart1/2″ (15 NB) to 48″ (1200NB) DN10~DN5000
Reducing Flanges b16.5 StandardsANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ANSI Reducing Flange, ASME Reducing Flange, BS Reducing Flange, DIN Reducing Flange, EN Reducing Flange, GOST Flange, ASME/ANSI B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605, EN1092
ANSI B16.5 Reducing Flangese Pressure Rating ANSIClass 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS Reducing Flange
Stainless Steel Reducing Flanges Pressure Calculation in DIN6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64 Reducing Flange
JIS ANSI B16.5 Class 150 reducing threaded flange5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K Reducing Flange
UNI ASME B16.5 Reducing Flanges6Bar 10Bar 16Bar 25Bar 40Bar Reducing Flange
EN ASTM A182 SS reducing wn flange6Bar 10Bar 16Bar 25Bar 40Bar Reducing Flange
Coating For Alloy Steel reducing Flanges socket weldOil Black Paint, Anti-rust Paint, Zinc Plated, Yellow Transparent, Cold and Hot Dip Galvanized Reducing Flange
Most common types of Reducing FlangeForged / Threaded / Screwed / Plate
Test CertificatesEN 10204/3.1B
Raw Materials Certificate
100% Radiography Test Report
Third Party Inspection Report, etc
Production technique
  • Forged, Heat treated and machined
Connect Type/ Flange Face TypeRaised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, Groove
Special design

As per your drawing

AS, ANSI, BS, DIN and JIS
15 NB (1/2″) to 200 NB (8″)
Equal and Reducing Configurations

TestDirect-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector
EquipmentPress machine, Bending machine, Pushing Machine, electric bevelling machine, Sand-blasting machine etc
OriginIndian / West Europe / Japan / USA / Korean
Manufacturer of ASME B16.47 Series A and B Reducing Flanges

ANSI DIN, GOST, JIS, UNI, BS, AS2129, AWWA, EN, SABS, NFE etc.
Reducing Flange: -BS Flange, EN Flange, API 6A Flange, ANSI Flange, ASME Flange, DIN Flange, EN1092-1 Flange, UNI Flange, JIS/ KS Flange, BS4504 Flange, GB Flange, AWWA C207 Flange, GOST Flange, PSI Flange

  • B.S: BS4504 , BS3293, BS1560, BS10
  • AS 2129: Table D; Table E; Table H
  • ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
  • ANSI : ANSI B16.5, ANSI B16.47(API605), MSS SP44, ANSI B16.36, ANSI B16.48
  • ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48
  • American standard (ANSI)
  • German (DIN)
  • British standard (BS)
  • DIN: DIN 2527, DIN 2566, DIN 2573, DIN 2576, DIN 2641, DIN 2642, DIN 2655, DIN 2656, DIN 2627, DIN 2628, DIN 2629, DIN 2631, DIN 2632, DIN 2633, DIN 2634, DIN 2635, DIN 2636, DIN 2637, DIN 2638 Reducing Flange
  • The other standard: AWWA C207; EN1092-1, GOST12820, JIS B2220; KS B1503, SABS1123; NFE29203; UNI2276
Reducing Flange Uses & application
  • Bitumen upgraders.
  • Heavy oil refineries.
  • Nuclear power (mostly seamless).
  • Petrochemicals and acids.
Export to Carbon Steel Reducing FlangeIreland, Singapore, Indonesia, Ukraine, Saudi Arabia, Spain, Canada, USA, Brazil, Thailand, Korea, Iran, India, Egypt, Oman, Dubai, Peru, etc
Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2, Test Certificates certifying NACE MR0103, NACE MR0175

Reducing Flange Material & Grades

Carbon Steel Reducing FlangeASTM/ASME A/SA105 A/SA105N & A/SA216-WCB, DIN 1.0402, DIN 1.0460, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, High Yield CS ASTM A694 / A694 (F52 F56 F60 F65 F70 F80)
Stainless Steel Reducings FlangesASTM/ASME A/SA182 F304, F304L, F316, F316L, ASTM/ASME A/SA351 CF8, CF3, CF8M, CF3M, DIN 1.4301, DIN 1.4306, DIN 1.4401, DIN 1.4404, DIN 1.4308, DIN 1.4408, DIN 1.4306, DIN 1.4409
Alloy Steel reducings Flanges socket weldASTM A182 / ASME SA182 F5, F9, F11, F12, F22, F91
Titanium Reducings FlangeASTM B381 / ASME SB381, Titanium Gr. 1, Titanium Gr. 2, Titanium Gr. 4, Titanium Gr. 5, Titanium Gr. 7
ASTM R50250/GR.1 | R50400/GR.2 | R50550/GR.3 | R50700/GR.4 | GR.6 |R52400/GR.7 | R53400/GR.12 | R56320/GR.9 |R56400/GR.5
Copper Reducings FlangeT1, T2, C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10910,C10920, TP1, TP2, C10930, C11000, C11300, C11400, C11500, C11600, C12000,C12200, C12300, TU1, TU2, C12500, C14200, C14420, C14500, C14510, C14520, C14530, C17200, C19200, C21000, C23000, C26000, C27000, C27400, C28000, C33000, C33200, C37000, C44300, C44400, C44500, C60800, C63020, C68700, C70400, C70600, C70620, C71000, C71500, C71520, C71640, etc
Copper Nickel Reducings FlangesASTM / ASME SB 61 / 62 / 151 / 152, Copper Nickel 90/10 (C70600 ), Cupro Nickel 70/30 (C71500), UNS C71640
Brass Reducings Flange3602 / 2604 / H59 / H62 / etc.
Inconel reducings pipe FlangesASTM B564 / ASME SB564, Inconel 600, 601, 625, 718, 783, 690, x750 Flange
Hastelloy C22 Reducings FlangeASTM B564 / ASME SB564, Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X Flange
Monel Reducings FlangeASTM B564 / ASME SB564, Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500)
Alloy 20 Reducings FlangesASTM B462 / ASME SB462, Carpenter® 20 Alloy, Alloy 20Cb-3
Aluminium Reducings Flange5052 /6061/ 6063 / 2017 / 7075 / etc.
Nickel Reducings FlangeASTM B564 / ASME SB564, Nickel 200, Nickel 201, Nickel 205, Nickel 205LC
Duplex Steel reducings Flanges slip onS31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Super Duplex Steel reducings Flanges slip onS32750 / S32760 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Inconel reducings pipe FlangesASTM B564 / ASME SB564, Incoloy 800, 800H, 800HT (UNS N08800), 825 (UNS N08825), 925 Flange
254 Smo Reducings FlangeASTM A182 / ASME SA182, SMO 254/6Mo, UNS S31254, DIN 1.4547
Nimonic Reducings FlangeNimonic 75, Nimonic 80A, Nimonic 90
Other DIN86029 PN10 Reducings Flanges MaterialTin bronze, Alumunum bronze, Lead bronze

Type of ASME B16.5 Reducing Flanges

ASME B16.5 Reducing Flanges

ASME B16.5 Reducing Flanges

ASME B16.5 reducing Flanges without hub

ASME B16.5 reducing Flanges without hub

ANSI B16.5 reducing Flanges threaded

ANSI B16.5 reducing Flanges threaded

ASME B16.47 Series a reducing pipe Flanges

ASME B16.47 Series a reducing pipe Flanges

ASME B16.47 Series b reducing Flanges slip on

ASME B16.47 Series b reducing Flanges slip on

ANSI B16.5 Class 150 reducing filler flange

ASME B16.5 Class 300 raised face reducing flange

Flat face reducing flange EN 1092-1 Type 02

Flat face reducing flange EN 1092-1 Type 02

EN 1092-2 PN16 reducing threaded pipe Flanges

EN 1092-2 PN16 reducing threaded pipe Flanges

Forged stainless reducing Flanges

Forged stainless reducing Flanges

AWWA C207 Class d threaded reducing flange

AWWA C207 Class d threaded reducing flange

MSS SP-44 class 150 reducing flange

MSS SP-44 class 150 reducing flange

Reducing Flange Standards

ANSI/ASME B16.47 FlangesANSI/ASME B16.36 FlangesANSI/ASME B16.5 FlangesPr. EN1902-1 Flanges
DIN FlangesJIS FlangesBS 4504 FlangesBS 10 Flanges
MSS SP-44 FlangesJIS B2220 FlangesKS B1503 FlangesUNI Flanges
SABS/SANS 1123 FlangesAS 2129, AS 4087 FlangesISO 9624, ISO 7005-1 FlangesAWWA Flanges Standard
GOST Standard FlangesAPI FlangesAS/ANZ 4331.1 FlangesSeries A Flange
Series B FlangeSAE J518 FlangesGB FlangeNorwegian Standard Flanges

ASME B16.5 Reducing Flanges Dimensions

ANSI B16.5 Class 150 Reducing Threaded Flange

NPS

DIAMETER

THICKNESS

DIA.

WELDING

MIN.

MIN.

MIN.

NECK

WELDING

JOINT

DN

O

T

A

B

C

D

E

F

G

H

1/2

5.25

1.19

1.38

 

0.88

.90

0.93

2.88

1.56

1.56

15

133

30.5

34.9

 

22.2

22.9

23.5

73.0

40

40

3/4

5.50

1.25

1.69

 

1.09

1.11

1.14

3.12

1.69

1.69

20

140

32.0

42.9

 

27.8

28.2

29.0

79.4

43

43

1

6.25

1.38

2.00

 

1.36

1.38

1.41

3.50

1.88

1.88

25

159

35.0

50.8

 

34.5

34.9

36.0

88.9

48

48

1 1/4

7.25

1.50

2.50

 

1.70

1.72

1.75

3.75

2.06

2.06

32

184

38.5

63.5

 

43.3

43.7

44.5

95.2

52

52

1 1/2

8.00

1.75

2.88

 

1.95

1.97

1.99

4.38

2.38

2.38

40

203

44.5

73.0

 

49.6

50.0

50.5

111.4

60

60

2

9.25

2.00

3.62

To be

2.44

2.46

2.50

5.00

2.75

2.75

50

235

51.0

92.1

61.9

62.5

63.5

127.0

70

70

2 1/2

10.50

2.25

4.12

specified

2.94

2.97

3.00

5.62

3.12

3.12

65

267

57.5

104.8

74.6

75.4

76

142.9

79

79

 

3

12.00

2.62

5.00

by

3.57

3.60

3.63

6.62

3.62

3.62

80

305

67.0

127.0

90.7

91.4

92

168.2

92

92

 

4

14.00

3.00

6.19

purchaser

4.57

4.60

4.63

7.50

4.25

4.25

100

356

76.5

157.2

 

116.1

116.8

118

190.5

108

108

5

16.50

3.62

7.31

 

5.66

5.69

5.69

9.00

5.12

5.12

125

419

92.5

185.7

 

143.7

144.5

145

228.6

130

130

6

19.00

4.25

8.50

 

6.72

6.75

6.75

10.75

6.0

6.0

150

483

108.0

215.9

 

170.7

171.4

171

273.0

152

152

8

21.75

5.00

10.62

 

8.72

8.75

8.75

12.50

7.0

7.0

200

552

127.0

269.9

 

221.5

222.2

222

317.5

178

178

10

26.50

6.50

12.75

 

10.88

10.92

10.88

16.50

9.0

9.0

250

675

165.5

323.8

 

276.2

277.4

276

419.4

229

229

12

30.00

7.25

15.00

 

12.88

12.92

12.94

18.25

10.0

10.0

300

760

184.5

381.0

 

327.0

328.2

329

463.6

254

254

ASME B16.5 Reducing Flanges Size Chart

Nominal SizeTypeØ ADLiner
Thickness
DN1DN2
In.In. mmmmmm
3/4″1/2″198.5305.0
1″1/2″1108305.0
1″3/4″1108305.0
1.1/2″1/2″1127305.0
1.1/2″3/4″1127305.0
1.1/2″1″1127305.0
2″1/2″3152305.0
2″3/4″2152305.0
2″1″2152305.0
2″1.1/2″1152305.0
3″3/4″3190.5355.0
3″1″3190.5355.0
3″1.1/2″2190.5355.0
3″2″1190.5355.0
4″3/4″3228.6355.0
4″1″3228.6355.0
4″1.1/2″3228.6355.0
4″2″3228.6355.0
4″3″2228.6355.0
6″3/4″3280405.0
6″1″3280405.0
6″1.1/2″3280405.0
6″2″3280405.0
6″3″3280405.0
6″4″2280405.0
8″1″3343355.0
8″1.1/2″3343355.0
8″2″3343405.0
8″3″3343405.0
8″4″3343405.0
8″6″2343405.0
10″1″3406352.5
10″1.1/2″3406352.5
10″2″3406352.5
10″3″3406352.5
10″4″3406352.5
10″6″3406352.5
10″8″2406353.5
12″1″3483353.5
12″1.1/2″3483353.5
12″2″3483353.5
12″3″3483353.5
12″4″3483353.5
12″6″3483353.5
12″8″3483353.5
12″10″2483353.5
14″12″1533403.5
16″12″3597403.5
16″14″2597353.5

DIN86029 PN10 Reducing Flanges Pressure Ratings

Flanges pressure rating in psig for Reducing Flange ASME
Temperature (F°)150#300#400#600#900#1500#2500#
-20 to 1002857409851480222037056170
2002606809051360203533955655
3002306558701310196532705450
4002006358451265190031705280
5001706058051205181030155025
6001405707551135170528404730
6501255507301100165027454575
7001105307101060159026554425
750955056751015152025354230
80080410550825123520553430
8506532042564095515952655
9005023030546069011501915
950351351852754106851145
10002085115170255430715

Reducing Flange Industries and Applications

Reducing flanges are used in various industries and applications, including:

  • Pumps, Valves, and Vessels: In manufacturing and food processing.
  • Pipe Connections: For industrial water systems.
  • Heat Exchangers and Heating Systems: In all sizes.
  • Mining Support: For mining operations.
  • Nuclear Power Systems: In nuclear energy facilities.
  • Plumbing and Mechanical Systems: For general plumbing and mechanical uses.
  • Oil, Gas, and Petrochemical Industries: In various assemblies within these sectors.

Fire Protection Systems: For fire safety applications.

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