BTU Blending • Wobbe Index • Peak Shaving Analysis
Wobbe Index (WI = BTU/√SG) determines fuel gas interchangeability. Pipeline-quality gas typically requires WI between 1290–1400. Values outside this range may cause combustion issues in end-use equipment.
Understand air-gas blending principles, calculations, and industry applications
| Gas Type | BTU/cf | Sp. Gravity | Wobbe Index |
|---|---|---|---|
| Pipeline Natural Gas | 1,000–1,050 | 0.58–0.62 | 1,310–1,390 |
| Propane (C₃H₈) | 2,516 | 1.52 | 2,041 |
| Butane (C₄H₁₀) | 3,262 | 2.01 | 2,302 |
| Propane-Air (55/45) | 1,384 | 1.29 | 1,218 |
It calculates blended gas properties including heating value, specific gravity, Wobbe Index, and peak shaving requirements per AGA and ASTM standards.
The calculator is compliant with AGA Bulletin 36 and ASTM D3588 for gas blending and BTU adjustment.
The Wobbe Index measures interchangeability of fuel gases, ensuring blended gas will perform correctly in equipment designed for a specific gas type.