Choosing different alternations for many ships.
1.To introduce the program of the heavy 1000 seconds or 1500 seconds to replace the light fuel oil, it can reduce fuel the cost of 30%-40% per ton;
2.To create buoyancy compartment in the bow of main deck, increse the ship full load draught and deadweight;
3.To lenghten the ship reasonably, improve ship deadweight;
4.To alternate ships which have platform deck and second hatch cover for convenient loading and increasing boat load.