Aligned-axis steel transitions with both weld ends specified
We supply carbon steel concentric butt weld reducers for two-size pipe connections. Both openings share one centerline, preserving the aligned-axis transition shown on the spool drawing. Each item identifies the large and small pipe sizes, end walls and required length.
| Size order | Large-end NPS × small-end NPS |
|---|---|
| Material | Required carbon steel grade, including A234 WPB orders |
| Construction | Specified seamless or welded fitting route |
| Large-end connection | Required OD, wall and weld-end preparation |
| Small-end connection | Required OD, wall and weld-end preparation |
| Length and alignment | Adopted B16.9 row or approved special fitting drawing |
Check the two opening diameters and end-to-end length against the adjoining pipework.
| Large × small NPS (in.) | Large-end OD (mm) | Small-end OD (mm) | End-to-end length H (mm) |
|---|---|---|---|
| 2 × 1 | 60.3 | 33.4 | 76 |
| 2-1/2 × 2 | 73.0 | 60.3 | 89 |
| 3 × 2 | 88.9 | 60.3 | 89 |
| 4 × 3 | 114.3 | 88.9 | 102 |
| 6 × 4 | 168.3 | 114.3 | 140 |
| 8 × 6 | 219.1 | 168.3 | 152 |
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ASME B16.9 layout reference, cross-checked in the Weldbend metric reducer tables. Concentric and eccentric patterns can share these end sizes and lengths while having different centerline alignment. Wall thickness and pressure rating stay on the fitting line.
ASTM A234 WPB identifies a carbon steel fitting grade. The fitting material and required delivery condition are retained alongside the dimensional standard and manufacturing route.
Standard reducer dimensions provide defined weld-end sizes and length. A longer taper or different size combination is a special fitting item, with its own drawing and acceptance basis.
Reducer wall and bore fit follow the required joint and service design. Neither a schedule number nor the nominal reducer size supplies a standalone working-pressure rating.
The smaller opening remains centered relative to the large end. That geometry preserves the specified pipe centerline; a reducer with one straight side is a different pattern.
End machining addresses the required bore and wall at each pipe connection. The internal step and transition are checked against the weld detail.
A change in reducer length shifts the smaller pipe or adjoining equipment connection. A two-size match is therefore checked with the end-to-end dimension before the fitting replaces an existing item.
A common-axis reducer can retain the vertical centerline through a size change. The process and piping design still determine whether that geometry is appropriate for the service.
The reducer locates two different pipe sizes on one axis. Adjacent elbows, flanges and supports are coordinated from the required end positions, not from the taper’s appearance.
The large and small end diameters and walls are checked against their individual requirements. Each end is measured on its own.
The end-to-end dimension and common-axis relationship are checked to the selected pattern. Special transitions retain the drawing revision used for those measurements.
Finished edges, visible surface condition and required material identity are checked before packing. Any specified examination follows the fitting’s construction and order requirements.
Our quotation identifies the large and small NPS, their required walls, material, construction and end-to-end length. The concentric designation stays with that item.
Separators protect both bevels and keep different wall or reducer patterns distinguishable. Common-axis pieces remain identified separately from eccentric fittings of the same nominal size pair.
Required material records, dimensional results, special coating and packing are listed with the supply. Site welding and complete spool assembly are separate work unless included in the offer.
The process and piping design determine the flow direction and fitting selection. A concentric reducer is a geometric size transition; its name alone does not establish the pressure loss or operating conditions for an expanding flow.
No. The fabrication route, material, end dimensions and required acceptance must identify the supplied fitting. An externally similar cone does not establish compliance with the adopted wrought-fitting specification.
The actual end ODs, walls and weld details must be reconciled. Nominal DN or inch labels can refer to different diameter series; a transition between those series needs its own identified end geometry.
No. The surface finish does not establish the construction. Seamless or welded manufacture is identified in the supply description and required records.
Shortening changes the end diameter or wall position along the taper and the finished length. That modification needs an approved fitting detail and end preparation before the altered piece can replace the specified reducer.
Loose reducer supply covers the fitting and its stated end preparation. Matching pipe lengths, flanges and spool fabrication are separate items when included in the material order.
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Provide both pipe sizes and end walls, material, construction, required length and quantities. Add the destination for an itemized fitting supply quote.