Grooved 90° Reducing Elbow
- Standard: ASME B16.9, ASME B16.11 .
- Material: carbon steel, cast iron, stainless steel
- Certification: UL/FM for fire protection systems.
- Diameter: DN15 (1/2“) to DN200 (8”)
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The Grooved 90° Reducing Elbow connects grooved pipe of different diameters, allowing 90° turning and adapting to reducer piping systems to reduce fluid resistance. Conforms to ASME B16.9, ASTM A420 and other standards. Application areas may be in fire fighting, chemical industry, water treatment, etc.
Grooved 90° Reducing Elbow
- Certification requirements: fire protection system through UL/FM certification, ASME B16.9 dimensional standards to certify its industrial scenario.
- Carbon steel/stainless steel: OD tolerance ± 0.1~0.3mm, adjust its wall thickness according to the pressure level (e.g., DN50 wall thickness ≥ 3mm).
- Seal selection: EPDM rubber for water system, chemical media need to use fluorine rubber or EPDM rubber.
- Elbow design performance: 90 ° elbow design reduces fluid resistance and pressure loss, to avoid the impact of turbulence on the pipeline.
Grooved 90° Reducing Elbow Dimensions
| NPS | Outside Diameter (inches) | Wall thickness (Sch 40, inches) | Center to End Face (Long Radius, inches) |
| 1/2×3/8 | 0.84 | 0.109 | 1.5 |
| 1×3/4 | 1.315 | 0.133 | 1.5 |
| 2×1.5 | 2.375 | 0.154 | 3 |
| 3×2.5 | 3.5 | 0.216 | 4.5 |
| 4×3 | 4.5 | 0.237 | 6 |
| 6×5 | 6.625 | 0.28 | 9 |
| 8×6 | 8.625 | 0.322 | 12 |
Note: OD tolerances are ±0.01 to 0.03 inches, wall thicknesses are adjusted for Sch grades (e.g., Sch 80 wall thicknesses are higher)
Differences Between American Standard and National Standard
| Parameter | ASME Standards | GB/T Standards |
| Dimensional Reference | Based on NPS (Nominal Pipe Size) in inches | Based on DN (Diameter Nominal) in millimeters |
| Pressure Rating | Defined by Class (e.g., Class 150, 300), which decreases with temperature | Defined by PN (Nominal Pressure) as a fixed value at 20°C, requiring temperature correction factors |
| Outer Diameter (OD) Tolerance | ±0.01–0.03 inches | ±0.1–0.3 mm |
| Flange Compatibility | Follows ASME B16.5 for bolt hole patterns and dimensions | Follows HG/T 20592 (aligned with EN standards), with larger bolt hole tolerance (±1.5mm vs. ASME’s ±0.8mm) |