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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesAn LNG cargo is natural gas chilled into liquid form so it can be carried by ship. A commonly used approximation is that one cubic metre of liquid LNG becomes about 600 cubic metres of natural gas when warmed back into gas. The amount aboard a ship varies by vessel: the U.S. Energy Information Administration (EIA) reported an average carrier capacity of 150,000 m³ in 2014, while a National Academies report describes about 174,000 m³ as the most-built large-carrier size.
What an LNG cargo is
Natural gas is cooled to about −260°F (−162°C), turning it into liquefied natural gas, or LNG. In liquid form it occupies roughly one-six-hundredth of the volume it would occupy as gas, making ship transport practical. The U.S. Energy Information Administration explains the approximate 600-to-1 volume relationship in its LNG overview; the U.S. Department of Energy also describes LNG as cooled for shipping and storage in its LNG overview.
A cargo is the LNG carried on a particular voyage. A ship’s stated capacity is the maximum volume it is designed to hold, not proof that it carried that full volume on a given trip.
How much gas one cargo can represent
To estimate gaseous volume, multiply liquid LNG volume by roughly 600. This is an explanatory approximation: exact conversion depends on LNG composition and the measurement conditions used for the resulting gas.
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| Vessel or figure | Liquid capacity or volume | Approximate gas-volume equivalent | What the figure means |
|---|---|---|---|
| EIA average carrier capacity, reported in 2014 | 150,000 m³ LNG | About 90 million m³ of gas, by multiplying 150,000 by the approximate 600 ratio | Historical reported fleet average capacity, not a universal or current cargo size. The EIA separately described this capacity as approximately 3,300 million cubic feet of gas in gaseous form. EIA, June 19, 2014 |
| Most-built large carrier size described by the National Academies | About 174,000 m³ LNG | About 104 million m³ of gas, using the same approximate ratio | A size description in the report, not a current global average or a claim about every loaded cargo. National Academies, chapter 4 |
| Q-Max example cited by the EIA in 2014 | 266,000 m³ LNG | About 160 million m³ of gas, using the same approximate ratio | An example of a very large vessel, not a typical ship. EIA, June 19, 2014 |
The National Academies report groups LNG carriers into several capacity classes: under 150,000 m³; 150,000–160,000 m³; 160,000–169,000 m³; 170,000–179,000 m³; and 180,000–200,000 m³. It also lists Q-Flex vessels at 210,000–215,000 m³ and Q-Max vessels around 260,000 m³. Those categories show why “one cargo” has no single fixed volume. The report describes 170,000–179,000 m³ vessels as the bulk of the large trading fleet and about 174,000 m³ as the most-built size; this is a fleet characterization in the report, not a definitive current census.
What happens after the ship arrives
At a receiving terminal, LNG is unloaded into insulated storage tanks and kept cold until needed. It is then warmed in a process called regasification and sent into a pipeline network for customers such as power plants and industrial facilities. The EIA outlines unloading and regasification in its LNG explanation. The Department of Energy describes the same sequence: “Once the ship arrives at the receiving port, LNG is off-loaded into well-insulated storage tanks, and later regasified for entrance into a pipeline distribution network.”
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Why gas volume does not tell you how much energy a cargo supplies
A gas-volume equivalent is not the same thing as an energy amount or a count of homes supplied. The energy available from a cargo depends on the LNG’s composition and quality, while a household or power-plant comparison also requires a defined consumption rate and time period. The cited sources do not establish a universal energy equivalent, number of households, or duration of supply for one LNG cargo.
For a cargo-specific estimate, you would need the actual quantity loaded, its energy content or composition, and the relevant gas-volume measurement conditions. Without those inputs, the 600-to-1 relationship supports a rough volume comparison only.
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