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Flange Weight Calculator Guide – Accurate & Easy
Flanges play a crucial role in piping systems. Understanding their weight and dimensions is essential for efficient design, transport, and cost calculation. This guide provides a detailed Flange Weight Calculator along with ready-made weight charts from Class 150 to Class 2500 flanges.
This article is designed for engineers, fabricators, buyers, and suppliers dealing in Stainless Steel Flanges, Carbon Steel Flanges, or Alloy Steel Flanges.
Why Flange Weight Matters
- Transport & Logistics: Knowing the flange weight helps avoid overloading during shipping.
- Structural Design: Accurate weight ensures proper support in pipe systems.
- Costing: Heavier flanges increase overall material and fabrication costs.
- Storage Planning: Proper inventory management requires exact weight data.
Flange Weight Calculator
Flange Weight Calculation Formula
Theoretical flange weight is calculated using the following formula:
Where:
- Volume = π × (Outer Diameter² – Inner Diameter²) × Thickness / 4
- Density varies by material:
- Stainless Steel ≈ 7.9 g/cm³
- Carbon Steel ≈ 7.85 g/cm³
You may also use spreadsheets or CAD tools for faster results.
Flange Weight Chart – Class 150
Class 150 flange dimensions and weight estimates:
| NPS | OD (mm) | Thickness (mm) | Approx. Weight (kg) |
|---|---|---|---|
| 1/2" | 90 | 11.2 | 1.5 |
| 1" | 100 | 12.7 | 2.5 |
| 2" | 150 | 15.9 | 4.8 |
| 4" | 229 | 19.1 | 12.5 |
| 6" | 279 | 22.2 | 21.4 |
| 8" | 343 | 24.3 | 35.8 |
Note: These values are approximate. Refer to ASME B16.5 standards for final engineering use.
Flange Weight Charts – Class 300 to 2500
Class 300 Flange
| NPS | OD (mm) | Thickness (mm) | Approx. Weight (kg) |
|---|---|---|---|
| 1/2" | 95 | 14.3 | 2.0 |
| 1" | 117 | 16.0 | 3.6 |
| 2" | 165 | 19.1 | 6.9 |
| 6" | 318 | 25.4 | 28.6 |
Higher Pressure Classes (Approximate Weights for 6”)
| Pressure Class | Weight Range (kg) |
|---|---|
| Class 600 | 35 – 40 |
| Class 900 | 55 – 60 |
| Class 1500 | 70 – 90 |
| Class 2500 | 110 – 130 |
For exact weights, refer to the ASME B16.5 and B16.47 standard charts.
Material-Wise Flange Weights
| Material | Density (g/cm³) | Characteristics |
|---|---|---|
| Stainless Steel | 7.9 | Corrosion-resistant and durable |
| Carbon Steel | 7.85 | Economical and strong |
| Alloy Steel | 7.7 – 8.0 | Suitable for high temp/pressure |
| Cast Iron | 7.2 | Lower cost, used in basic systems |
Internal Links – Related Stainless Steel Products
We are not promoting any brand here, but if you're looking for reliable solutions, explore these pages:
- Stainless Steel Flanges – Suitable for hygienic and industrial systems.
- Stainless Steel Pipe – Available in seamless and welded options.
- Sanitary Pipe Fittings – Food-grade and pharma-ready fittings.
- Buttweld Pipe Fittings – Designed for secure and durable connections.
