Butt-weld concentric reducers for transitioning between different pipe sizes while maintaining a common centerline. Available in carbon steel, low-temperature carbon steel, alloy steel and stainless steel according to project requirements.
A concentric reducer is a pipe fitting used to connect pipes of different nominal sizes while maintaining the same centerline. The fitting provides a gradual transition between the larger and smaller pipe diameters.
Concentric reducers are commonly used where the piping arrangement permits the centerline of the connected pipes to remain aligned. They are available in different sizes, schedules and material grades according to the applicable piping specification.
Rhevon can source concentric reducers for process piping, oil & gas, petrochemical, chemical, power, utility and general industrial applications.
Supplied according to required size combination, schedule, material and applicable specification.
The appropriate reducer configuration depends on the piping arrangement, flow requirements and available installation space.
Provides a symmetrical transition between different pipe sizes while maintaining a common centerline between the larger and smaller ends.
Reducers can be supplied for different combinations of larger and smaller nominal pipe sizes, subject to the applicable standard and manufacturing range.
Material selection can be matched to the operating temperature, pressure, process media and applicable project specification.
| Material | Typical Specification | Typical Application |
|---|---|---|
| Carbon Steel | ASTM A234 WPB | General Process · Oil & Gas |
| Low-Temperature Carbon Steel | ASTM A420 WPL6 | Low-Temperature Service |
| Alloy Steel | ASTM A234 WP11 / WP22 | High-Temperature Service |
| Stainless Steel | ASTM A403 WP304 / WP316 | Corrosive / Process Service |
Reference overall lengths for concentric reducers by large and small nominal pipe size.
| Large NPS | Small NPS selections | H(mm) |
|---|---|---|
| ¾ | ½ | 38.10 |
| 1 | ¾, ½ | 50.80 |
| 1 ¼ | 1, ¾, ½ | 50.80 |
| 1 ½ | 1 ¼, 1, ¾, ½ | 63.50 |
| 2 | 1 ½, 1 ¼, 1, ¾ | 76.20 |
| 2 ½ | 2, 1 ½, 1 ¼, 1 | 88.90 |
| 3 | 2 ½, 2, 1 ½, 1 ¼ | 88.90 |
| 3 ½ | 3, 2 ½, 2, 1 ½, 1 ¼ | 101.60 |
| 4 | 3 ½, 3, 2 ½, 2, 1 ½ | 101.60 |
| 5 | 4, 3 ½, 3, 2 ½, 2 | 127.00 |
| 6 | 5, 4, 3 ½, 3, 2 ½ | 139.70 |
| 8 | 6, 5, 4, 3 ½ | 152.40 |
Obtain D, d and the wall at each end from catalog page 3.
Do not assume equal wall thickness at unequal ends. Special reduction ratios require an approved supplier drawing.
Product requirements can be reviewed against the applicable material specification, dimensional standard and purchase order requirements before supply.
Common questions about concentric reducer specifications, sizing, materials and applications.
A concentric reducer connects pipes of different nominal sizes while maintaining a common centerline. It is used where a symmetrical transition between the larger and smaller pipe is suitable for the piping arrangement.
A concentric reducer maintains a common centerline between the two pipe ends, while an eccentric reducer has an offset centerline. The appropriate configuration depends on the piping layout, flow arrangement and installation requirements.
Butt-weld concentric reducers are generally supplied to applicable ASME B16.9 dimensional requirements, with the material specified separately according to the applicable ASTM material specification.
Ideally, provide the larger NPS, smaller NPS, material grade, schedule or wall thickness, quantity and applicable standard. Project specifications, service conditions or special requirements can also be included where applicable.
Yes. Concentric reducers can be included along with elbows, tees, caps, flanges, gaskets, fasteners and other piping components in a single Bill of Materials. Rhevon can review the complete requirement and coordinate sourcing accordingly.
Share the larger and smaller pipe sizes, schedule, material, quantity and applicable specification. Mixed piping component requirements are also welcome.
