Pipe Concentric Reducer
Greater Melbourne Stainless Steel Supplies
PIPE CONCENTRIC REDUCER
Mill Finish| NB | Inches | ODmm | SCH10 | SCH10 | SCH40 | SCH40 |
|---|---|---|---|---|---|---|
| 304 | 316 | 304 | 316 | |||
| 20 | 3/4" | 26.67 | – | 20 > 15 | 20 > 15 | – |
| 25 | 1" | 33.41 | – | – | – | 25 > 15 |
| 25 | 1" | 33.41 | – | – | – | 25 > 20 |
| 32 | 1 1/4" | 42.16 | – | 32 > 20 | – | 32 > 25 |
| 40 | 1 1/2" | 48.26 | – | 40 > 25 | – | 40 > 25 |
| 40 | 1 1/2" | 48.26 | – | 40 > 32 | – | 40 > 32 |
| 50 | 2" | 60.3 | – | 50 > 25 | – | 50 > 25 |
| 50 | 2" | 60.3 | – | 50 > 32 | – | – |
| 50 | 2" | 60.3 | – | 50 > 40 | – | 50 > 40 |
| 65 | 2 1/2" | 73.03 | – | 65 > 40 | – | 65 > 40 |
| 65 | 2 1/2" | 73.03 | – | 65 > 50 | – | 65 > 50 |
| 80 | 3" | 88.9 | – | 80 > 25 | – | – |
| 80 | 3" | 88.9 | – | 80 > 40 | – | 80 > 40 |
| 80 | 3" | 88.9 | – | 80 > 50 | – | 80 > 50 |
| 80 | 3" | 88.9 | – | 80 > 65 | – | – |
| 100 | 4" | 114.3 | 100 > 50 | 100 > 50 | 100 > 50 | 100 > 50 |
| 100 | 4" | 114.3 | – | 100 > 65 | 100 > 65 | 100 > 65 |
| 100 | 4" | 114.3 | 100 > 80 | 100 > 80 | – | 100 > 80 |
| 125 | 5" | 141.3 | 125 > 100 | – | – | – |
| 150 | 6" | 168.28 | 150 > 80 | 150 > 100 | – | – |
| 150 | 6" | 168.28 | – | 150 > 125 | – | – |
| 200 | 8" | 219.18 | 200 > 100 | 200 > 100 | – | – |
| 200 | 8" | 219.18 | 200 > 125 | – | – | – |
The Pipe Concentric Reducer is a stainless steel butt-weld pipe fitting used to transition between two different pipe bore sizes while maintaining a perfectly aligned shared centreline axis between the larger and smaller ends. As shown in the image, the fitting presents a smooth, symmetrical tapered body wider at the inlet end and tapering uniformly to a smaller outlet diameter with the centreline of both ends in perfect axial alignment. This concentric geometry makes it the standard choice for vertical pipe runs and any installation where consistent pipe centreline alignment is required throughout the bore size transition.
Supplied in mill finish and available in both SCH10 and SCH40 wall thickness schedules across Grade 304 and Grade 316 stainless steel, the range covers nominal bore sizes from 20NB (3/4") through to 200NB (8"), with outside diameters from 26.67mm up to 219.18mm. The SCH10 range offers the broadest size and reduction combination coverage across both grades, while the SCH40 range covers the smaller bore sizes where heavier wall thickness is more commonly specified.
Reduction combinations span from modest single-step reductions such as 20 × 15 and 25 × 20 through to larger multi-step reductions, including 200 × 100 and 150 × 80, providing engineers with the flexibility to achieve precise flow velocity and pressure management at bore transition points throughout the piping system. The smooth internal tapered bore minimises turbulence, pressure drop, and flow velocity change at the transition point, maintaining hydraulic efficiency through the reducer.
Grade 304 covers the majority of general industrial, water, and process piping applications. Grade 316 with molybdenum is specified for chemical, food processing, marine, and offshore installations where superior chloride corrosion resistance is required. The butt weld end preparation on both ends enables full-penetration weld joints suitable for high-pressure and elevated-temperature service.
