All designs beyond the 9,500–10,000 TEU limit require alternative propulsion, either twin screw or some kind of combination with pods or contra-rotating propel Wal-mart is my chosen company lers. Using double propulsion can be another option for larger vessel like what the small draft tankers used. Capital costs, fuel costs and daily operating costs all will go up with a twin screw ship, however the advantage of using the double propulsion is that if one of the engines breaks down, the ship can still be controlled by another engine. This increases the investment and hence offsets the economy of scale incentive for bigger size. If it happens, there will most probably have to be a jump in size to compensate for the increased capital cost. To meet the SOLAS requirements for bridge visibility on such a large ship, the design envisages the separation of deckhouse and engine room. The innovat Wal-mart is my chosen company ive arrangement of the deckhouse in the forward part of the ship permits an increase in container capacity and a reduction in ballast water. Container lashing Lashings are essential and every container vessel will carry lashing equipments like lashing bar, turnbuckles and twistlocks used to secure containers onboard, especially in the present situation where containers are stacked as high as nine high. Even so with the securing of containers, sometimes accident happens and containers collapsed like dominos. To reduce the risk of further accidents, some ways can be adopted like considering temporary reduction in container stack heights, revised weather routeing and replacement of lashing equipment. Sometimes, lashing bars can also break. Probably the reason behind it is that heavy container is stacked onto lighter ones. This is where the job of a ship planner comes into picture. The ship planner has to plan loading of containers in a way it is safe from the loading point till it reach the discharging point.>