本项目燃料罐采用双耳立式设计，单侧设置气室及人孔，结构高度达32米，是中集太平洋海工首次建造的超高立式双耳罐，将安装在德国船东Hartmann公司的3500TEU集装箱船上。据悉，3500TEU集装箱船为车滚装船，该船甲板上及舱内空间主要用于装载汽车，空间紧凑，而采用双耳立式存放的燃料罐设计，可以为甲板滚装区域及货舱内纵向空间释放部分容量，以达到装载量最大化的目的。

然而，构造这样的燃料罐绝非易事，其独特的结构形式给项目建造带来了较大挑战：

限定的场地资源

作为中集太平洋海工目前最高的燃料罐，其结构合拢受限于900T桥吊区域，超高结构和指定的生产制作区域将对公司其它燃料罐产品发货造成影响。对此，项目组及海工各部门精心组织生产，严格执行计划；同时，与其他产品项目组积极沟通，策划发货方案，保证项目间的影响降到最小。

全新的立式鞍座设计

项目启动之初，团队即着手策划水压试验鞍座设计方案。按常规要求，燃料罐充满水后，罐身和托架总重将超过5200吨，对立式鞍座结构强度、地面承受都提出了新的挑战。为确保试验安全进行，项目组精心计算鞍座结构强度和刚性、地面受力情况，确保满足安全要求。

水气结合压力试验

为进一步确保水压试验安全进行，项目组提出采用水气结合的压力试验方案，并与客户AC-INOX公司、船东Hartmann公司、船级社充分讨论，吸纳船东和船检方的建议，持续完善方案。最终，中集太平洋海工成功实现首次在C型罐上采用水气结合压力试验。

The fuel tank of this project adopts a two-ear vertical design, with an air chamber and manhole on one side, with a structural height of 32 meters. It is the first ultra-high vertical amphoric tank built by CMP Offshore Engineering, and will be installed on a 3500TEU container ship of Hartmann Company, a German ship owner. It is reported that 3500TEU container ship is a ro-ro ship, the ship's deck and cabin space is mainly used for loading cars, compact space, and the use of two-ear vertical storage fuel tank design, can release part of the capacity for the deck ro-ro area and the longitudinal space in the cargo hold, in order to maximize the purpose of loading.

However, the construction of such a fuel tank is not easy, and its unique structural form has brought great challenges to the construction of the project:

Limited site resources

As CIMC Pacific Marine Engineering's highest fuel tank at present, its structural closure is limited to the 900T bridge crane area, and the ultra-high structure and designated production area will affect the company's other fuel tank products. In this regard, the project team and various departments of offshore engineering carefully organize production and strictly implement the plan; At the same time, actively communicate with other product project teams to plan delivery plans to ensure that the impact between projects is minimized.

New upright saddle design

At the beginning of the project, the team began to plan the design of the hydraulic test saddle. According to the conventional requirements, after the fuel tank is filled with water, the total weight of the tank body and bracket will exceed 5200 tons, which poses new challenges to the structural strength of the vertical saddle and the ground bearing. In order to ensure the safety of the test, the project team carefully calculated the strength and rigidity of the saddle structure and the force on the ground to ensure that the safety requirements were met.

Water gas combination pressure test

In order to further ensure the safety of the water pressure test, the project team proposed a pressure test scheme combining water and gas, and fully discussed it with the customers AC-INOX, the owner Hartmann and the classification society to absorb the suggestions of the owner and the ship surveyor and continue to improve the scheme. In the end, CIMC Pacific Marine Engineering successfully achieved the first water-gas combined pressure test on the C-type tank.