Reducing Pipe Flange Suppliers | ASME/ANSI B16.5, B16.47 Series A & B, B16.48
A reducing flange is a type of flange designed to connect pipes or fittings of different sizes. It features two different diameter openings: one side has a larger bore, while the other side has a smaller bore. This allows the flange to facilitate a transition between two pipes or components with different sizes, making it a critical part of systems that require a size reduction in fluid or gas flow. The design of reducing flanges allows for a secure, leak-proof connection while accommodating different pipe sizes. It is available in both slip-on and weld-neck designs, with the choice depending on the application’s pressure and temperature requirements. Reducing flanges are manufactured to meet various industry standards, such as ASME B16.5, DIN, and ANSI, ensuring compatibility and reliable performance.
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ANSI B16.5 Reducing pipe flange Specifications
Size Range
15mm ( 1/2" NPS ) up to 600mm ( 24" NPS ), For 2500# in sizes from NPS 1/2 to NPS 12
Flange Face Type
FF—Flat Face, RF—Raised Face, FM—Female Face, M—Male Face, T—Tongue Face, G—Groove Face, RJ—Ring Joint.
Stainless Steel
ASTM A182 F 304, 304L, 304H, 316, 316L, 316H, 317, 317L, 321, 321H, 310, 310S, 347, 904L, etc.
Standards / Dimension
ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN
Carbon Steel
ASTM A105/A105N (SA105N), LTCS A350 LF2, A694
Alloy Steel
ASTM A182 / SA182 - F1 / F5 / F9 / F11 / F12 / F22 / F91
Pressure Class
150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64.
Duplex & Super Duplex
ASTM A182 / ASME SA182 - S31803, S32205, 2205, S32750, S32760, S32950, 2507.
MTC
EN 10204 3.2 and EN 10204 3.1, Test Certificates certifying NACE MR0175, NACE MR0103
ASME B16.5 Reducing Flange - Dimensions & Weight
| Nominal Size | Type | Ø A | D | Liner Thickness |
|
|---|---|---|---|---|---|
| DN1 | DN2 | ||||
| In. | In. | mm | mm | mm | |
| 3/4″ | 1/2″ | 1 | 98.5 | 30 | 5.0 |
| 1″ | 1/2″ | 1 | 108 | 30 | 5.0 |
| 1″ | 3/4″ | 1 | 108 | 30 | 5.0 |
| 1.1/2″ | 1/2″ | 1 | 127 | 30 | 5.0 |
| 1.1/2″ | 3/4″ | 1 | 127 | 30 | 5.0 |
| 1.1/2″ | 1″ | 1 | 127 | 30 | 5.0 |
| 2″ | 1/2″ | 3 | 152 | 30 | 5.0 |
| 2″ | 3/4″ | 2 | 152 | 30 | 5.0 |
| 2″ | 1″ | 2 | 152 | 30 | 5.0 |
| 2″ | 1.1/2″ | 1 | 152 | 30 | 5.0 |
| 3″ | 3/4″ | 3 | 190.5 | 35 | 5.0 |
| 3″ | 1″ | 3 | 190.5 | 35 | 5.0 |
| 3″ | 1.1/2″ | 2 | 190.5 | 35 | 5.0 |
| 3″ | 2″ | 1 | 190.5 | 35 | 5.0 |
| 4″ | 3/4″ | 3 | 228.6 | 35 | 5.0 |
| 4″ | 1″ | 3 | 228.6 | 35 | 5.0 |
| 4″ | 1.1/2″ | 3 | 228.6 | 35 | 5.0 |
| 4″ | 2″ | 3 | 228.6 | 35 | 5.0 |
| 4″ | 3″ | 2 | 228.6 | 35 | 5.0 |
| 6″ | 3/4″ | 3 | 280 | 40 | 5.0 |
| 6″ | 1″ | 3 | 280 | 40 | 5.0 |
| 6″ | 1.1/2″ | 3 | 280 | 40 | 5.0 |
| 6″ | 2″ | 3 | 280 | 40 | 5.0 |
| 6″ | 3″ | 3 | 280 | 40 | 5.0 |
| 6″ | 4″ | 2 | 280 | 40 | 5.0 |
| 8″ | 1″ | 3 | 343 | 35 | 5.0 |
| 8″ | 1.1/2″ | 3 | 343 | 35 | 5.0 |
| 8″ | 2″ | 3 | 343 | 40 | 5.0 |
| 8″ | 3″ | 3 | 343 | 40 | 5.0 |
| 8″ | 4″ | 3 | 343 | 40 | 5.0 |
| 8″ | 6″ | 2 | 343 | 40 | 5.0 |
| 10″ | 1″ | 3 | 406 | 35 | 2.5 |
| 10″ | 1.1/2″ | 3 | 406 | 35 | 2.5 |
| 10″ | 2″ | 3 | 406 | 35 | 2.5 |
| 10″ | 3″ | 3 | 406 | 35 | 2.5 |
| 10″ | 4″ | 3 | 406 | 35 | 2.5 |
| 10″ | 6″ | 3 | 406 | 35 | 2.5 |
| 10″ | 8″ | 2 | 406 | 35 | 3.5 |
| 12″ | 1″ | 3 | 483 | 35 | 3.5 |
| 12″ | 1.1/2″ | 3 | 483 | 35 | 3.5 |
| 12″ | 2″ | 3 | 483 | 35 | 3.5 |
| 12″ | 3″ | 3 | 483 | 35 | 3.5 |
| 12″ | 4″ | 3 | 483 | 35 | 3.5 |
| 12″ | 6″ | 3 | 483 | 35 | 3.5 |
| 12″ | 8″ | 3 | 483 | 35 | 3.5 |
| 12″ | 10″ | 2 | 483 | 35 | 3.5 |
| 14″ | 12″ | 1 | 533 | 40 | 3.5 |
| 16″ | 12″ | 3 | 597 | 40 | 3.5 |
| 16″ | 14″ | 2 | 597 | 35 | 3.5 |
ANSI Reducing Flange Standards
Reducing Flange Standards are established to ensure compatibility, reliability, and safety when using reducing flanges in piping systems. These standards govern dimensions, materials, pressure ratings, and manufacturing tolerances for various types of reducing flanges.
- ASME/ANSI Standards (American):
- ASME B16.5 – Pipe Flanges and Flanged Fittings (NPS 1/2" to 24").
- ASME B16.47 – Large Diameter Steel Flanges (Series A & B, NPS 26" to 60").
- ASME B16.36 – Orifice Flanges.
- ASME B16.48 – Line Blanks (Spectacle, Spade, and Spacer Flanges).
- ANSI B16.1 – Cast Iron Flanges and Flanged Fittings.
- ANSI B16.42 – Ductile Iron Pipe Flanges and Flanged Fittings.
- ISO Standards (International)
- ISO 7005-1 – Steel Flanges for General Applications.
- ISO 7005-2 – Cast Iron Flanges.
- ISO 7005-3 – Copper Alloy Flanges.
- EN Standards (European)
- EN 1092-1 – Steel Flanges.
- EN 1092-2 – Cast Iron Flanges.
- EN 1092-3 – Copper Alloy Flanges.
- EN 1092-4 – Aluminium Alloy Flanges.
- DIN Standards (German)
- DIN 2527 – Blind Flanges.
- DIN 2576 – Slip-On Flanges (PN 10).
- DIN 2633 – Weld Neck Flanges (PN 16).
- DIN 2634 – Weld Neck Flanges (PN 25).
- DIN 2635 – Weld Neck Flanges (PN 40).
- JIS Standards (Japanese)
- JIS B2220 – Steel Pipe Flanges.
- GOST Standards (Russian)
- GOST 12820 – Flat Flanges for Steel Pipe Joints.
- GOST 12821 – Steel Welded Flanges for High-Pressure Applications.
- GOST 33259 – Flange Connections for Industrial Equipment and Pipelines.
- BS Standards (British)
- BS 4504 – Circular Flanges for Pipes, Valves, and Fittings.
- BS 10 – Specification for Flanges and Bolting.
- API Standards (Oil & Gas)
- API 6A – Wellhead and Christmas Tree Equipment Flanges.
- API 605 – Large-Diameter Carbon Steel Flanges (merged into ASME B16.47 Series B).
- AWWA Standards (Waterworks)
- AWWA C207 – Steel Ring Flanges for Waterworks Service.
- MSS Standards (Manufacturer's Standardization Society)
- MSS SP-44 – Steel Pipe Flanges (merged into ASME B16.47 Series A).
- MSS SP-51 – Flanges for Glass-Lined Equipment.
- Material-Specific Standards (ASTM)
- ASTM A105 – Carbon Steel Forged Flanges.
- ASTM A182 – Alloy and Stainless Steel Forged Flanges.
- ASTM A350 – Carbon and Low-Alloy Steel Flanges for Low-Temperature Service.
- ASTM A694 – High-Strength Carbon and Alloy Steel Flanges for High-Pressure Applications.
- Other Regional and Specialized Standards
- KS B1511 – Korean Standard Flanges.
- NF E29-206 – French Standard Flanges.
- SANS 1123 – South African Standard for Steel Flanges.
Why Ample Alloys For Pipe reducing flange!
Ample Alloys provides competitive pricing, on-time delivery, and exceptional after-sales support, making it the preferred choice for high-quality Reducing Flanges worldwide.
Quality Assurance
Ample Alloys offers high-quality pipe reducing flanges that meet international standards such as ASME, ANSI, and DIN, ensuring superior performance in every application.
Customization
Ample Alloys provides customized reducing flanges to meet specific project requirements, offering a wide range of sizes, materials, and pressure ratings.
Durability
Made from premium materials like stainless steel, carbon steel, and alloy steel, Ample Alloys' reducing flanges are designed for durability and resistance to corrosion, pressure, and temperature fluctuations.
Expert Support
The team at Ample Alloys provides expert guidance and support, assisting in selecting the right reducing flange for each application, ensuring efficiency and reliability.
Yes, reducing flanges can be customized to meet specific project requirements, including size, material, and pressure ratings. Customization ensures compatibility with unique piping systems.
The main difference is that a reducing flange has two different-sized openings to connect pipes of varying diameters, while a standard flange has the same size openings on both sides for connecting pipes of equal size.
Yes, reducing flanges are available in a range of pressure classes, typically from 150 lbs to 2500 lbs, based on the specific needs of the application and the piping system.
