Calculator Inputs
Example Data Table
| Asset | Gas | Method | Annual gas mass (kg) | GWP | Annual CO₂e (tCO₂e) |
|---|---|---|---|---|---|
| Compressor station A | Methane | Component count | 41.6200 | 27.9 | 1.1612 |
| Cold storage loop B | HFC-134a | Refrigerant loss | 48.0000 | 1430 | 68.6400 |
| Switchgear zone C | SF₆ | Refrigerant loss | 1.1000 | 25200 | 27.7200 |
Formula Used
Component Count Method:
Annual fugitive mass (kg/year) = Σ [Component count × Emission factor × Operating day factor × Control factor]
Operating day factor = Operating days ÷ 365
Control factor = (1 − Capture efficiency) × (1 − Maintenance reduction)
Refrigerant Loss Method:
Annual fugitive mass (kg/year) = [(Charge × Leak rate × Operating day factor) + Installation losses + Service losses + Disposal losses − Recovered gas] × Control factor
Carbon dioxide equivalent:
Annual CO₂e (tonnes) = Annual fugitive mass (kg) × GWP ÷ 1000
How to Use This Calculator
- Select the calculation method that matches your data.
- Enter the greenhouse gas name and its global warming potential.
- Set annual operating days, capture efficiency, and maintenance reduction.
- Fill component counts and factors, or refrigerant leak and loss data.
- Press Calculate Emissions to show results above the form.
- Review the summary, detailed breakdown, and chart.
- Use the CSV or PDF buttons for reporting exports.
FAQs
1. What are fugitive emissions?
Fugitive emissions are unintended greenhouse gas releases from equipment, piping, seals, storage, or handling activities. They often come from leaks, venting, losses during servicing, and imperfect recovery practices.
2. Which method should I choose?
Use the component method when you have equipment counts and emission factors. Use the refrigerant loss method when you know charge size, leak rate, servicing losses, disposal losses, and recovered gas amounts.
3. Why is global warming potential required?
Global warming potential converts gas mass into carbon dioxide equivalent. This allows comparison across gases and aligns results with climate inventories, ESG reporting, and disclosure frameworks.
4. Can I use custom GWP values?
Yes. The calculator accepts any numeric GWP. Enter the value required by your reporting standard, regulatory program, or internal carbon accounting methodology.
5. What does capture efficiency mean?
Capture efficiency represents the share of fugitive gas prevented or captured before release. Higher efficiency lowers net emissions and can reflect recovery systems, vapor capture, or improved containment.
6. What does maintenance reduction mean?
Maintenance reduction reflects leak prevention from inspections, repairs, replacements, or better operating practice. It applies an additional reduction after baseline emissions are estimated.
7. Are the results suitable for formal disclosure?
The calculator is useful for screening, internal planning, and preliminary estimates. Formal disclosure may require approved emission factors, documented assumptions, source boundaries, and framework-specific methodologies.
8. Why do results change with operating days?
Operating days scale annualized leakage where emissions depend on time in service. Fewer operating days reduce the time factor and lower the estimated annual release.