C型独立液货舱开孔区域的强度对整个液货舱围护系统的安全性至关重要。根据压力容器规范计算方法对罐体上气室处开孔及气室封头上的接管处开孔进行强度校核,并提出补强设计方案;通过有限元计算方法对补强方案进行验证与研究。结果表明,气室处开孔应力水平较高,通过设置复板及增加气室筒体板厚的方式能最有效改善该区域的强度。

C型独立舱型式的小型液化气船,其液货系统(含液货罐)的设计是难点。液货罐的自身质量和液货质量由与船体相连的两道鞍座来承受,罐体内部的加强环则承载了鞍座处的支反力,因此鞍座处加强环的强度尤为重要。文中提出了一种在设计初期确定鞍座处液罐内加强环尺寸的方法,并采用有限元分析法验证了该方法的可行性。

The external draft of Harmonized Common Structural Rules(CSR-H) for Bulk Carriers and Oil Tankers has been released for external review. Based on a consistent methodology at the adoption of the current CSR, CSR-H aims to be in compliance with the IMO GBS where GBS functional requirements fall within the scope, and the safety level is equivalent to or higher than the current CSR criteria. In this paper, by consequence assessment on a 320k VLCC, a 163k Suezmax tanker, a 115k Aframax tanker, a 76k Panamax tanker and a 48k MR tanker, the results of the comparison on the structural scantlings to CSR, the evaluation on the increasing of steel weight and some critical technique issues are discussed.