Abstract: The seagoing ships using liquefied natural gas (LNG) fuel are becoming popular for transportation ships with the increasing green and low-carbon requirements internationally. The International Maritime Organization has issued the International Code of Safety for Ships Using Gases or Other Low-Flashpoint Fuels (IGF code), which provides the principal requirements of the loads and design conditions for the design of the fuel tank containment systems using low ignition fuel. However, there is no guidance on the structural strength evaluation of the LNG fuel tank, and the coordination with the loading conditions and evaluation criteria for the transportation ships such as oil tankers, bulk carriers and container carriers, resulting in low operability. It carries out studies by combining the load requirements for the fuel tank design in the IGF code and the relevant requirements in the CSR. A direct calculation method for the structural strength of the fuel tank of an oil tanker using LNG fuel is proposed, including the model range, load conditions, and strength evaluation criteria. The finite element direct calculation for the fuel tank of a CSR oil tank is carried out for full-scale verification. The results show that the method is reasonable and feasible, and it can provide guidance for the structural strength evaluation of LNG fuel tanks of similar ships.

Key words: liquefied natural gas(LNG) dual-fuel oil tanker, fuel tank, structural strength, direct calculation

摘要： 随着国际社会对绿色低碳要求逐步提高,采用液化天然气（liquefied natural gas,LNG）燃料的海船正成为运输船主流趋势。国际海事组织发布《使用气体或其他低闪点燃料船舶的国际安全规则》（简称“IGF规则”）,虽然对使用低闪点燃料的燃料舱围护系统设计给出了载荷和设计条件的原则性要求,但对如何开展LNG燃料舱结构强度评估并同油船、散货船、集装箱船等运输船型的装载工况和评估衡准进行协调,则缺乏明确的指导,故操作性不高。该文结合IGF规则的燃料舱设计载荷要求及共同结构规范相关要求开展研究,提出了一种使用LNG燃料的油船燃料舱区域的船体结构强度直接计算方法,包括模型范围、载荷工况和强度评估衡准等,并以某油船为例,进行了燃料舱区域有限元直接计算的实船验证。结果表明该方法合理可行,并可为同类船舶的LNG燃料舱结构强度评估提供指导。

关键词: LNG双燃料油船, 燃料舱, 结构强度, 直接计算