Carbon dioxide transport and sequestration marine vessel

A method for operating a marine vessel, the method comprising:

• offloading liquid cargo from a marine vessel out of at least one liquid storage tank disposed within each of at least two holds within the marine vessel;
• and
• during offloading of the liquid cargo, loading water ballast into each of the holds from which liquid cargo is offloaded, wherein the total weight of water ballast loaded to each hold is proportional to the total weight of liquid cargo offloaded from the marine vessel out of each hold based on the density of the water ballast and the density of the liquid cargo.

A method for operating a marine vessel, the method comprising:

• loading liquid cargo onto a marine vessel into at least one liquid storage tank disposed within each of at least two holds within the marine vessel;
• during loading of the liquid cargo, offloading water ballast from each of the holds in which liquid cargo is loaded, wherein the total weight of water ballast offloaded from each hold is proportional to the total weight of liquid cargo loaded onto the marine vessel in the corresponding hold based on the density of the water ballast and the density of the liquid cargo;
• and adjusting the flowrate of at least one of liquid cargo being loaded or water ballast being offloaded in order to maintain as constant at least one condition of the marine vessel during loading of liquid cargo, where the at least one condition is selected from the group consisting of waterline, deadweight distribution, hull girder loading, mass inertia, stability, and motions, wherein the offloading of the water ballast occurs simultaneously with the loading of the liquid cargo.

A method for operating a marine vessel, the method comprising:

• loading liquid cargo onto a marine vessel into at least one liquid storage tank disposed within each of at least two holds within the marine vessel;
• during loading of the liquid cargo, offloading water ballast from each of the holds in which liquid cargo is loaded, wherein the total weight of water ballast offloaded from each hold is proportional to the total weight of liquid cargo loaded onto the marine vessel in the corresponding hold based on the density of the water ballast and the density of the liquid cargo, wherein loading liquid cargo comprises pumping a gaseous cargo onboard the marine vessel, liquifying the gaseous cargo to produce a cryogenic cargo, and storing the cryogenic cargo in one or more liquid storage tanks onboard the marine vessel.

A method for operating a marine vessel, the method comprising:

• loading cargo onto a marine vessel into at least one cargo hold within the marine vessel;
• and
• during loading of the cargo, simultaneously offloading water ballast from the cargo hold in which cargo is loaded, wherein the total weight and distribution of water ballast offloaded from the cargo hold is proportional to the total weight and distribution of cargo loaded onto the marine vessel in the cargo hold based on the density of the water ballast and the weight of the cargo.