Sample Solution

argo tank space of the vessel is used for this.
Comparison between tank types
Tank type A and type B are the tanks with a low maximum pressure. With a low pressure it is more difficult to contain the required temperature of the LNG. With these tanks you need re-liquefaction units. The other disadvantage of these tanks is that the tank takes cargo space while Tank type C is placed on deck. And the last disadvantage of these tanks are that they are less safe than tank type C, tank C has a second barrier and very good insulation. Type c is also safer because the tank is resistant to higher pressures, so they can purge inert gas to the tank without any safety issues when there is a dangerous situation.
Advantages of vertical type C in relation to horizontal type C tank
Cost savings for material and construction
When the diameter of the tank increases , the tank price will increase too. The vertical tanks is able to increase the length of the tank and to decrease the diameter easier than the horizontal tanks. The horizontal tanks have to be fitted on deck and are dependent of the ship lay out.
Stability and stress distribution
It is more easy to place a vertical tank on a solid flat surface, this will be more difficult with a horizontal tank because the horizontal tank will take more space and the chance that you have to make a type of support will be bigger. The stress distribution of the tank will be less when the tank is bolted on a flat surface. The cylindrical vertical storage tank design provides a better pressure distribution due to elimination of stress points that are in horizontal and square tanks.
Vertical tanks have also less issues with free surface aspects like fuel sloshing.
Efficiency
The vertical tank has a better efficiency because all the weight of the LNG is pushing down to a smaller area, so it will be easier for the pump.
Reduction of footprint
The space used by a vertical tank is much lower than a horizontal tank.
When you’re looking at the design of the ship, then there will be 2 options of placement of the fuel tanks. In the front of the ship just before the accommodation or behind the funnel at the back of the ship. In the middle of the ship are a lot of pipes, manifolds and cargo handling equipm