American Butt Weld Reducing Tee
- Material: carbon steel, duplex steel, Hastelloy.
- Standard: ASME B16.9-2024、API 5L 55th.
- Temperature Range: -200 ~ 900°C (UNS N08825).
- American Butt Weld Straight Tee
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The American Butt Weld Reducing Tee is a core component in pipework systems for connecting branches of different pipe diameters with up to 50 per cent difference in size between main and branch (e.g. NPS 8 x 8 x 4).
American Butt Weld Reducing Tee
- The main (Run) and branch (Branch) diameters are different (e.g., NPS 8 x 6 x 8, indicating an 8-inch main and a 6-inch branch).
- Butt Weld connections are used to ensure that the strength of the weld is consistent with the body of the pipe, reducing turbulence and pressure drop.
- Maximum 50% reduction allowed, additional support structure required for >50% reducer ratio (anti-vibration fatigue).
- Avoid carbon steel tees for H₂S environments (NACE MR0175 certification required)
Common Materials
Something to keep in mind:
Carbide decomposition (carbon steel): >425°C, the need for internal wall cladding of nickel-based alloys.
Stainless steel: 600 ~ 900 ° C long-term service after the impact function decline, need to control the Cr / Mo content.
Duplex steel: H₂ partial pressure > 0.1bar need to use ultra-low carbon variant (C ≤ 0.02%).
| Material | Temperature Range | Suitable Media | 2025 Enhancements |
| A234 WPB (Carbon Steel) | -29°C ~ 425°C | Water, Steam, Oil & Gas | New H₂-resistant coating (H₂ ≤20MPa) |
| 316L (Stainless Steel) | -196°C ~ 800°C | Corrosive Fluids, High-Temp Chemicals | Optimized σ-phase embrittlement threshold model |
| UNS N06625 (Nickel Alloy) | -253°C ~ 1095°C | Supercritical CO₂, Molten Salts | AI-driven grain boundary oxidation lifetime prediction |
| Duplex 2205 (Duplex Steel) | -50°C ~ 300°C | Seawater, Acidic Oil & Gas | 30% improvement in chloride SCC resistance |
American Butt Weld Reducing Tee Dimensions and Weight
