LNG Methane Slip - GWP20 / GWP100 GHG
Methane-slip-corrected GHG footprint of an LNG DF engine using GWP_20 and GWP_100 factors - reveals the well-to-wake penalty of unburnt CH₄.
CH₄ as CO₂eq (GWP100)
7,000t/yr
Total CO₂eq (GWP100)
34,500t/yr
Methane-slip penalty
25.5%
Formula, assumptions, and limits
GWP100 = 28 (AR6), GWP20 = 82. Lean-burn Otto DF engines 3–5 % slip; 2-stroke diesel-cycle < 0.5 %. Shifts LNG from net +20 % to net −2 % vs HFO.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Unburnt methane | t/yr | slip × fuel | |
| CO₂ from fuel combustion | t/yr | C_F × fuel |