Dixon T31W-200150PL BioPharm Weld Reducer SS PL finish - SF1
Available
This Dixon BioPharm weld reducer joins two BPE tube sizes end to end on a common centreline (concentric), with a weld end on each side. It is 316 stainless steel and Dixon lists sizes from 3/4" x 1/2" up to 6" x 4" (manufacturer-stated).
The PL finish (SF1) is mechanically polished on both surfaces: Dixon gives the outside as .812 and the inside as .508 (manufacturer-stated).
Dixon lists the reducer to ASME BPE 2012 (table DT-4.1.3-1) and lists eccentric reducers as a separate range. Its packing page says each fitting is capped, with a blue cap marking the PL finish (manufacturer-stated).
Where this product is used
- Transport of liquid media in the biotechnology, cosmetic and pharmaceutical industries (manufacturer-stated).
- Stepping a welded BPE tube run down from a larger tube to a smaller one.
- Systems where a mechanically polished inside surface (.508) meets the process specification.
Features
- Ends: weld x weld, concentric (manufacturer-stated)
- Material: 316 stainless steel; Dixon's packing page lists the material as 316L (manufacturer-stated)
- PL finish (SF1): outside .812 and inside .508, both mechanically polished (manufacturer-stated)
- Listed to ASME BPE 2012 (table DT-4.1.3-1) (manufacturer-stated)
- Supplied capped, with a blue cap marking the PL finish (manufacturer-stated)
Common specifications
| Specification | Detail |
|---|---|
| Material | 316 stainless steel (Dixon's packing page lists 316L) |
| Type | Weld x weld concentric reducer |
| Finish | PL (SF1): outside .812 and inside .508, both mechanically polished |
| Standard | ASME BPE 2012 (table DT-4.1.3-1) (manufacturer-stated) |
| Weld end chemical analysis (%) | Per ASME BPE Table DT-3: C 0.030 max, Mn 2.00 max, P 0.045 max, S 0.005 to 0.017, Si 1.00 max, Cr 16.00 to 18.00, Ni 10.00 to 15.00, Mo 2.00 to 3.00 (manufacturer-stated) |
| Sizes | 26 combinations from 3/4" x 1/2" to 6" x 4" |
PL and PM finish compared
| PL finish (SF1) | PM finish (SF4) | |
|---|---|---|
| Outside surface (OD) | Mechanically polished, .812 | Mechanically polished, .812 |
| Inside surface (ID) | Mechanically polished, .508 | Mechanically polished and electropolished, .381 |
| Dixon 2024 catalogue wording | OD 32 Ra, ID 20 Ra, mechanically polished | OD 32 Ra mechanically polished, ID 15 Ra mechanically polished and electropolished |
| Colour of the cap on each fitting | Blue | White |
Dixon prints the finish figures without a unit on its product pages. Its BPE surface finish table lists them as Ra maximum in micrometres (um), and the 2024 Dixon catalogue prints the same finishes as 32 Ra, 20 Ra and 15 Ra. Dixon describes mechanical polishing as smoothing the surface with tools and progressively finer abrasives, and electropolishing as an electrochemical process that removes material and leaves a smoother, mirror-like surface (all manufacturer-stated).
Key specifications
| Dixon part number | Size | Tube OD (mm) | Dimension A (mm) | Nominal wall (in) |
|---|---|---|---|---|
| T31W-075050PL | 3/4" x 1/2" | 19.05 x 12.7 | 101.60 | 0.065 x 0.065 |
| T31W-100050PL | 1" x 1/2" | 25.4 x 12.7 | 114.30 | 0.065 x 0.065 |
| T31W-100075PL | 1" x 3/4" | 25.4 x 19.05 | 101.60 | 0.065 x 0.065 |
| T31W-150050PL | 1-1/2" x 1/2" | 38.1 x 12.7 | 139.70 | 0.065 x 0.065 |
| T31W-150075PL | 1-1/2" x 3/4" | 38.1 x 19.05 | 127.00 | 0.065 x 0.065 |
| T31W-150100PL | 1-1/2" x 1" | 38.1 x 25.4 | 127.00 | 0.065 x 0.065 |
| T31W-200050PL | 2" x 1/2" | 50.8 x 12.7 | 196.85 | 0.065 x 0.065 |
| T31W-200075PL | 2" x 3/4" | 50.8 x 19.05 | 184.15 | 0.065 x 0.065 |
| T31W-200100PL | 2" x 1" | 50.8 x 25.4 | 184.15 | 0.065 x 0.065 |
| T31W-200150PL | 133.35 | |||
| T31W-250050PL | 2-1/2" x 1/2" | 63.5 x 12.7 | 247.65 | 0.065 x 0.065 |
| T31W-250075PL | 2-1/2" x 3/4" | 63.5 x 19.05 | 234.95 | 0.065 x 0.065 |
| T31W-250100PL | 2-1/2" x 1" | 63.5 x 25.4 | 234.95 | 0.065 x 0.065 |
| T31W-250150PL | 2-1/2" x 1-1/2" | 63.5 x 38.1 | 184.15 | 0.065 x 0.065 |
| T31W-250200PL | 2-1/2" x 2" | 63.5 x 50.8 | 139.70 | 0.065 x 0.065 |
| T31W-300100PL | 3" x 1" | 76.2 x 25.4 | 0.065 x 0.065 | |
| T31W-300150PL | 3" x 1-1/2" | 76.2 x 38.1 | 0.065 x 0.065 | |
| T31W-300200PL | 3" x 2" | 76.2 x 50.8 | 0.065 x 0.065 | |
| T31W-300250PL | 3" x 2-1/2" | 76.2 x 63.5 | 0.065 x 0.065 | |
| T31W-400100PL | 4" x 1" | 101.6 x 25.4 | 393.70 | 0.083 x 0.065 |
| T31W-400150PL | 4" x 1-1/2" | 101.6 x 38.1 | 342.90 | 0.083 x 0.065 |
| T31W-400200PL | 4" x 2" | 101.6 x 50.8 | 298.45 | 0.083 x 0.065 |
| T31W-400250PL | 4" x 2-1/2" | 101.6 x 63.5 | 247.65 | 0.083 x 0.065 |
| T31W-400300PL | 4" x 3" | 101.6 x 76.2 | 196.85 | 0.083 x 0.065 |
| T31W-600300PL | 6" x 3" | 152.4 x 76.2 | 254.00 | 0.109 x 0.065 |
| T31W-600400PL | 6" x 4" | 152.4 x 101.6 | 254.00 | 0.109 x 0.083 |
Dimension A and the tube OD are from Dixon's Australian catalogue; the nominal wall (large end x small end) is from the 2024 Dixon catalogue, in inches as Dixon prints it. Dimension A is not shown for the four 3" reducers (T31W-300100, T31W-300150, T31W-300200 and T31W-300250) because Dixon's catalogues give different figures for them, and the size of T31W-200150PL is not shown. Ask us to confirm these before ordering.
Selecting the right option
Read the size as large end x small end, and check both tube ODs and the nominal wall in the table. Choose the finish from your process specification: PL is mechanically polished inside and out and PM is electropolished inside. For a reducer where the two tubes must sit on a common centreline, concentric is the right type; ask us about Dixon's eccentric range if you need one.
Related products
Related Dixon products: Dixon BioPharm Weld Reducer SS PM Finish - SF4, Dixon BioPharm Weld Tee PL Finish - SF1, Dixon BioPharm 90° Weld Elbow PL Finish - SF1 and Dixon Automatic Weld Ferrule PL Finish - SF1.
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1" x 1/2"
Model Number: T31W-100050PL
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1" x 3/4"
Model Number: T31W-100075PL
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1 1/2" x 1/2"
Model Number: T31W-150050PL
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1 1/2" x 3/4"
Model Number: T31W-150075PL
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1 1/2" x 1"
Model Number: T31W-150100PL
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2" x 1/2"
Model Number: T31W-200050PL
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2" x 3/4"
Model Number: T31W-200075PL
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2" x 1"
Model Number: T31W-200100PL
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2" x 2 1/2"
Model Number: T31W-200150PL
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2 1/2" x 1/2"
Model Number: T31W-250050PL
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2 1/2" x 3/4"
Model Number: T31W-250075PL
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2 1/2" x 1"
Model Number: T31W-250100PL
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2 1/2" x 1 1/2"
Model Number: T31W-250150PL
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2 1/2" x 2"
Model Number: T31W-250200PL
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3/4" x 1/2"
Model Number: T31W-075050PL
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3" x 1"
Model Number: T31W-300100PL
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3" x 1 1/2"
Model Number: T31W-300150PL
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3" x 2"
Model Number: T31W-300200PL
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3" x 2 1/2"
Model Number: T31W-300250PL
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4" x 1"
Model Number: T31W-400100PL
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4" x 1 1/2"
Model Number: T31W-400150PL
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4" x 2"
Model Number: T31W-400200PL
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4" x 2 1/2"
Model Number: T31W-400250PL
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4" x 3"
Model Number: T31W-400300PL
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6" x 3"
Model Number: T31W-600300PL
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6" x 4"
Model Number: T31W-600400PL
