Meana Petro

HSE & emissions

Vented methane to CO₂ equivalent

A vented or fugitive gas volume converted to tonnes of methane and tonnes of CO₂ equivalent on both the 20- and 100-year horizons, with an OGMP 2.0 reporting level attached.

Inputs

Results

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How it is calculated

  • Methane mass = volume × methane mole fraction × 0.6785 kg/Sm³ at 15 °C and 101.325 kPa.
  • CO₂ equivalent uses IPCC AR6 GWPs including climate–carbon feedback: 82.5 over 20 years and 29.8 over 100.
  • Any CO₂ already in the stream is counted at a GWP of 1 and added.
  • Both horizons are always computed, because a CO₂e figure without its horizon is not a figure.

Standards it speaks

Where this stops being true

The arithmetic is trivial and the input is not. Vented volume is the hard number: generic emission factors, which is what most Level 3 reporting rests on, routinely under-count real emissions by a factor of two or more, because a site total is usually dominated by a small number of large intermittent sources that no factor captures. Nothing here measures anything — it converts a volume you supply, and the quality of the answer is entirely the quality of that volume.

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