🔧 ASME B16.5:2025 Flange Rating Calculator
Determine flange class based on design pressure and temperature per ASME B16.5:2025
Project Information
Design Conditions
Material Selection
📊 Calculation Results
⚠️ Warnings & Cautions
📋 Material Notes (per ASME B16.5:2025)
📈 Pressure-Temperature Rating Curves
● Design Point (Red) shows your operating conditions. The recommended class curve is highlighted.
📊 Allowable Pressures at Design Temperature
| Parameter | Class 150 | Class 300 | Class 600 | Class 900 | Class 1500 | Class 2500 |
|---|---|---|---|---|---|---|
| Allowable (bar) | - | - | - | - | - | - |
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⚠️ Disclaimer: This calculator is provided for informational purposes only. The results should be verified by a qualified engineer before use in any design or application. KW Piping assumes no responsibility or liability for any errors, omissions, or results obtained from the use of this calculator.

