
122
D
Deliverability Rate
a
typical round voyage of an LNG carrier. A typical delivery calculation for
a137,500m
3
LNG carrier might be
One-way distance 6,000 nautical miles
Ship “service” speed 19 knots
Sea days (round trips) 26.31
Port days (round trips) 2
Total days in voyage 28.31 say 29
Operating days in year 350
Voyages per year 12.07
Ship capacity (net) 135,000 m
3
Less: heel 3,000 m
3
Discharge quantity 132,000 m
3
Annual delivered quantity 132,000 × 12.07
=
1,539,103 m
3
LNG specic gravity varies depending on gas composition but is typically
about 0.45; therefore, the annual deliverability of the vessel is 0.45 × 1,593,103
716,896 metric tons. If ...