ASME B31.12 Hydrogen Pipeline Design Pressure
This tool is developed in accordance with ASME B31.12: Hydrogen Piping and Pipeline – Part PL to assist with hydrogen pipeline design calculations, specifically for determining the design pressure or minimum wall thickness based on location class and fracture control requirements.
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Basic Design Factor, F (Used with Option A)
Longitudinal Joints Factors for Pipeline Materials
| Spec. No. | Pipe Class | E Factor |
| API 5L | Seamless | 1.00 |
| Electric ressistance welded | 1.00 | |
| Electric flash welded | 1.00 | |
| Double submerged arc welded | 1.00 | |
| API A53 | Seamless | 1.00 |
| Electric ressistance welded | 1.00 | |
| ASTM A106 | Seamless | 1.00 |
| ASTM A134 | Electric fusion arc welded | 0.80 |
| ASTM A135 | Electric resistance welded | 1.00 |
| ASTM A139 | Electric fusion welded | 0.80 |
| ASTM A333 | Seamless | 1.00 |
| Electric ressistance welded | 1.00 | |
| ASTM A381 | Double submerged arc welded | 1.00 |
| ASTM A671 | Electric fusion welded | |
| Classes 13, 23, 33, 43, 53 | 0.80 | |
| Classes 12, 22, 32, 42, 52 | 1.00 | |
| ASTM A672 | Electric fusion welded | |
| Classes 13, 23, 33, 43, 53 | 0.80 | |
| Classes 12, 22, 32, 42, 52 | 1.00 |
Temperature Derating Factor, T, for Steel Pipe
| Temperature, °C (°F) | Temperature Derating Factor, T |
| 121 or less (250 or less) | 1.000 |
| 149 (300) | 0.967 |
| 177 (350) | 0.933 |
| 204 (400) | 0.900 |
| 232 (450) | 0.867 |
GENERAL NOTE: For intermediate temperatures, interpolate for derating factor.
Carbon Steep Pipeline Materials Performance Factor, Hf
| Specified Min. Strength, ksi | System Design Pressure, psig | |||||||
| Tensile | Yield | ≤ 1,000 | 2,000 | 2,200 | 2,400 | 2,600 | 2,800 | 3,000 |
| 66 and under | ≤ 52 | 1.0 | 1.0 | 0.954 | 0.910 | 0.880 | 0.840 | 0.780 |
| Over 66 through 75 | ≤ 60 | 0.874 | 0.874 | 0.834 | 0.796 | 0.770 | 0.734 | 0.682 |
| Over 75 through 82 | ≤ 70 | 0.776 | 0.776 | 0.742 | 0.706 | 0.684 | 0.652 | 0.606 |
| Over 82 through 90 | ≤ 80 | 0.694 | 0.694 | 0.662 | 0.632 | 0.610 | 0.584 | 0.542 |
SMYS for Steel Pipe Commonly Used in Pipeline Systems
| Specification No. | Grade | Type | SMYS | |
| psi | MPa | |||
| API 5L | A25 | ERW, S | 25,000 | 172 |
| A | ERW, S, DSA | 30,000 | 207 | |
| B | ERW, S, DSA | 35,000 | 241 | |
| X42 | ERW, S, DSA | 42,000 | 290 | |
| X52 | ERW, S, DSA | 52,000 | 359 | |
| API 5L | X56 | ERW, S, DSA | 56,000 | 386 |
| X60 | ERW, S, DSA | 60,000 | 414 | |
| X65 | ERW, S, DSA | 65,000 | 448 | |
| X70 | ERW, S, DSA | 70,000 | 483 | |
| X80 | ERW, S, DSA | 80,000 | 552 | |
| ASTM A53 | A | ERW, S | 30,000 | 207 |
| B | ERW, S | 35,000 | 241 | |
| ASTM A106 | A | S | 30,000 | 207 |
| B | S | 35,000 | 241 | |
| C | S | 40,000 | 276 | |
| ASTM A135 | A | EFW | 30,000 | 207 |
| B | EFW | 35,000 | 241 | |
| ASTM A139 | A | EFW | 30,000 | 207 |
| B | EFW | 35,000 | 241 | |
| C | EFW | 42,000 | 290 | |
| D | EFW | 46,000 | 317 | |
| E | EFW | 52,000 | 359 | |
| ASTM A333 | 1 | S, ERW | 30,000 | 207 |
| 6 | S, ERW | 35,000 | 241 | |
| ASTM A381 | Class Y-35 | DSA | 35,000 | 241 |
| Class Y-42 | DSA | 42,000 | 291 | |
| Class Y-46 | DSA | 46,000 | 317 | |
| Class Y-48 | DSA | 48,000 | 331 | |
| ASTM A381 | Class Y-50 | DSA | 50,000 | 345 |
| Class Y-52 | DSA | 52,000 | 359 | |
| Class Y-56 | DSA | 56,000 | 386 | |
| Class Y-60 | DSA | 60,000 | 414 | |
| Class Y-65 | DSA | 65,000 | 448 | |
Limitations on SMYS, S:
- When pipe that has been cold worked for meeting the SMYS is subsequently heated to a temperature higher than 482°C (900°F) for any period of time or over 315°C (600°F) for more than 1 h, the maximum allowable pressure at which it can be used shall not exceed 75% of the calculated pipe design pressure.
- In no case the specified minimum value of a mechanical property shall the higher actual value of a property be substituted in the steel pipe design pressure calculation. If the actual value is less than the specified minimum value of a mechanical property, the actual value may be used, when it is permitted by ASME B31.12.