Premium Carbon, Stainless & Alloy Steel Pipe Reducers
A pipe reducer is an essential pipe fitting designed to connect two pipes of different diameters, seamlessly reducing the flow volume and adjusting the piping system. We offer both Concentric and Eccentric reducers manufactured to strict international standards for exceptional durability and fluid dynamics.
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Types: Concentric Reducer (CON) & Eccentric Reducer (ECC).
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Size Range: Seamless (1/2″ ~ 24″) | ERW / Welded (1/2″ ~ 48″).
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Wall Thickness: 3mm ~ 40mm (SCH5 to XXS).
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Materials: Carbon Steel, Stainless Steel, and Alloy Steel.
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Standards: ASME B16.9, MSS SP-75, DIN 2616, JIS B2311, GB/T 12459.
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Applications: Petroleum, chemical processing, power plants, natural gas, metallurgy, and construction.
Description
1. Product Overview
A Pipe Reducer is a kind of pipe fitting used to join two pipes of different diameters, primarily applied to alter the fluid flow rate in a piping system. Depending on the alignment of the pipe centerlines, reducers are classified into two main types:
Concentric Reducer
Designed with matching centerlines. The reduction is uniform around the pipe. They are typically used in vertical pipe lines to maintain a symmetrical flow and reduce turbulence.
Eccentric Reducer
Designed with an offset centerline, maintaining a flat edge on one side (usually the bottom). They are essential in horizontal liquid pipelines to prevent the accumulation of air or gas bubbles.
2. General Specifications
| Feature | Details |
|---|---|
| Outer Diameter | Seamless: 1/2″ ~ 24″ ERW / Welded: 1/2″ ~ 48″ |
| Wall Thickness | 3mm ~ 40mm / SCH5, SCH10, SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
| Materials | Carbon Steel: SY/T5257, DL/T515, ASTM A234 WPB/WPC, ASTM A105 WPB/WPC, ASTM A420 WPL6/WPL3, DIN 17175-79, DIN 2448-81, ST45.8, ST35.8, DIN 1629, PB Stainless Steel: ASTM A403 WP304, 304L, 316, 316L, 321, 1Cr18Ni9Ti, 00Cr19Ni10, 00Cr17Ni14Mo2 Alloy Steel: ASTM A234 WP12, WP11, WP22, WP5, WP9, WP91, 16MnR, Cr5Mo, 12Cr1MoV, 10CrMo910, 15CrMo, 12Cr2Mo1 |
| Coating Options | Black paint, varnish, rust-proof oil, hot-dip galvanizing, cold galvanizing, 3PE coating, epoxy coating. |
| Usage | Petroleum, chemical, power, gas, metallurgy, shipbuilding, construction, etc. |
3. Executive Standards
| Standard Origin | Standard Code | Designation |
|---|---|---|
| ASME | ASME B16.9 | Factory-Made Wrought Buttwelding Fittings |
| ASME B16.28 | Wrought Steel Buttwelding Short Radius Elbows and Returns | |
| MSS | MSS SP-43 | Wrought and Fabricated Butt-Welding Fittings |
| MSS SP-75 | Specification for High Test Wrought Butt Welding Fittings | |
| DIN | DIN 2605 | Steel Butt-Welding Pipe Fittings |
| DIN 2616 | Steel Butt-Welding Pipe Fittings – Reducers | |
| JIS | JIS B2311 | Steel Butt-Welding Pipe Fittings for Ordinary Use |
| JIS B2312 | Steel Butt-Welding Pipe Fittings | |
| GB | GB/T 12459 | Steel Butt-Welding Pipe Fittings |
| GB/T 13401 | Steel Plate Butt-Welding Pipe Fittings |
4. Concentric & Eccentric Reducer Dimensions (ASME B16.9)
| Nominal Pipe Size (NPS) | Outside Diameter at Bevel (Large End) mm | Outside Diameter at Bevel (Small End) mm | End-to-End Length (H) mm |
|---|---|---|---|
| 3/4 x 1/2 | 26.7 | 21.3 | 38 |
| 1 x 1/2 | 33.4 | 21.3 | 51 |
| 1 x 3/4 | 33.4 | 26.7 | 51 |
| 1-1/4 x 3/4 | 42.2 | 26.7 | 51 |
| 1-1/4 x 1 | 42.2 | 33.4 | 51 |
| 1-1/2 x 1 | 48.3 | 33.4 | 64 |
| 1-1/2 x 1-1/4 | 48.3 | 42.2 | 64 |
| 2 x 1 | 60.3 | 33.4 | 76 |
| 2 x 1-1/4 | 60.3 | 42.2 | 76 |
| 2 x 1-1/2 | 60.3 | 48.3 | 76 |
| 2-1/2 x 1-1/2 | 73.0 | 48.3 | 89 |
| 2-1/2 x 2 | 73.0 | 60.3 | 89 |
| 3 x 2 | 88.9 | 60.3 | 89 |
| 3 x 2-1/2 | 88.9 | 73.0 | 89 |
| 4 x 2 | 114.3 | 60.3 | 102 |
| 4 x 2-1/2 | 114.3 | 73.0 | 102 |
| 4 x 3 | 114.3 | 88.9 | 102 |
| 5 x 3 | 141.3 | 88.9 | 127 |
| 5 x 4 | 141.3 | 114.3 | 127 |
| 6 x 3 | 168.3 | 88.9 | 140 |
| 6 x 4 | 168.3 | 114.3 | 140 |
| 6 x 5 | 168.3 | 141.3 | 140 |
| 8 x 4 | 219.1 | 114.3 | 152 |
| 8 x 6 | 219.1 | 168.3 | 152 |
| 10 x 6 | 273.0 | 168.3 | 178 |
| 10 x 8 | 273.0 | 219.1 | 178 |
| 12 x 8 | 323.8 | 219.1 | 203 |
| 12 x 10 | 323.8 | 273.0 | 203 |
| 14 x 10 | 355.6 | 273.0 | 330 |
| 14 x 12 | 355.6 | 323.8 | 330 |
| 16 x 12 | 406.4 | 323.8 | 356 |
| 16 x 14 | 406.4 | 355.6 | 356 |
| 18 x 14 | 457.0 | 355.6 | 381 |
| 18 x 16 | 457.0 | 406.4 | 381 |
| 20 x 16 | 508.0 | 406.4 | 508 |
| 20 x 18 | 508.0 | 457.0 | 508 |
| 24 x 18 | 610.0 | 457.0 | 508 |
| 24 x 20 | 610.0 | 508.0 | 508 |
Note: The table covers standard dimensions. Further sizes are available upon request.
5. Manufacturing Process Flow
Our pipe reducers are manufactured using precise hot pressing and expanding techniques to ensure uniform wall thickness and structural stability across the transitional gradient.
Raw Material Cutting → Heating → Hot Pressing / Expanding → Heat Treatment → Machining & Beveling → Inspection → Painting → Packing → Delivery.
