Design of filament-wound circular toroidal hydrogen storage vessels based on non-geodesic fiber trajectories

One of the most important design issues for filament-wound hydrogen storage vessels reflects on the determination of the optimal winding trajectories. The goal of this paper is to determine the optimal fiber paths and the resulting laminated structures for non-geodesically overwound circular toroidal hydrogen storage vessels. With the aid of the continuum theory and the non-geodesic law, the differential equations describing non-geodesic paths on a toroidal surface are given. The general criteria for avoiding fiber-bridging and slippage on a torus are formulated by differential geometry. The relation between the slippage coefficient and the winding angle is obtained to meet stable winding requirements. The initial winding angle and the slippage coefficient of non-geodesics are considered as the design variables, while the minimum shell mass acts as the objective function. The optimal non-geodesic trajectories, corresponding to various relative bending radii, are determined in order to evaluate the effect of non-geodesics on the structural performance of toroids. Results indicate that circular toroidal vessels designed using the present method show better performance than geodesics-based ones, mainly triggered by maximum utilization of the laminate strength. The results also reveal that the structural efficiency of circular toroidal vessels can be significantly improved using non-geodesic winding.     

压力容器抗应力腐蚀设计的讨论

本文分析了压力容器及设备在湿润硫化氢、氢氧化钠溶液和液氨介质中应力腐蚀开裂的机理和应力腐蚀开裂过程。分析了影响应力腐蚀开裂的环境因素、材料因素和应力因素。讲座了设计中的材料选择和技术要求。通过加强制造过程的管理降低残余应力，是经济有效方法之一。     

Probabilistic safety analyses developments resurgence in Bulgaria—Kozloduy nuclear power plant example

This paper presents some of the main technical features and insights of the Kozloduy nuclear power plant (NPP) units 5 and 6 probabilistic safety analysis (PSA) level 1. Probabilistic analyses and their applications in Bulgaria were given further impetus in recent years. More than 17 years after the first PSA study in Bulgaria in 1992 today probabilistic analyses receive increasing attention and application than ever before. The Bulgarian regulatory body (BNRA) is also interested in expanding their capability of reviewing and using PSA in plant safety assessments. In November 2008 within the framework of the program financed by European Union (PHARE), a project for assisting the BNRA in establishing the regulatory requirements on the base of PSA was completed. One of the objectives of this project was performance of the independent review of Kozloduy NPP units 5 and 6 PSA. This review was a new impulse for the authors to present in more details of Kozloduy NPP probabilistic assessment studies in the present paper.     

SW6-98编制说明及使用指南

ＳＷ６－９８自发行以来，已成为广大设备工程师朱设计工具。为了使得用户在理解标准有关条款的基础上，进一步正确使用ＳＷ６－９８，本文对ＳＷ６－９８中对ＣＢ１５０－１９９８中的部分设计参数选择，公式使用作了说明，并对ＳＷ６－９８的部分计算功能作了简单介绍。同时，对由于标准中的疏漏而引起的程序计算结果存在的问题进行了讨论。     

闪蒸分离釜壳体的疲劳分析

由于闪蒸分离釜为间歇操作,属受交变载荷作用的疲劳设备,在设备的强度设计时,需要对釜体进行疲劳分析。采用ANSYS通用有限元分析软件对设备的壳体进行应力分析,计算出设备各处的应力,并对其进行评定,为闪蒸分离釜的设计提供可靠依据。     

带夹套容器的结构及型式

本文概述了带夹套容器的基本要求、结构及型式。     

压力容器的安全技术管理

过程装备是从事现代化流程工业必不可少的物质技术基础,是生产力的主要因素,是企业投入产出的决定性环节,是企业质量保障体系的重要组成部分。随着科学发展、技术进步和生产方式的不断革新,机械设备不断向结构复杂化、性能高级化、技术综合化的方向发展。这就迫使从事装备工作的人们重新认识设备的重要性,管理好企业中的设备,而压力容器作为过程装备的重要组成部分,它的安全技术管理更是紧密的联系着企业的微观经济效益,社会的宏观经济效益。     

热处理工艺对13MnNiMoR压力容器用钢组织和性能的影响

对13MnNiMoR钢热轧态、正火态和回火态下的组织进行了对比分析,进行了常温及高温拉伸性能和冲击性能试验,研究了正火、回火工艺对试验钢组织和性能的影响。试验结果表明,试验钢的力学性能均能达到要求,但接近下限;应适当降低正火温度以获得较细的晶粒,或提高Nb含量,充分利用回火时Nb的碳氮化物析出,以提高强度。     

2万m~3大型烧碱储罐的节材和节能设计

探讨用于离子膜烧碱生产中的大型烧碱储罐的节材和节能设计的方法。     

超高压水晶釜超声检测方法及缺陷评定

在对超高压水晶釜结构特点及缺陷产生方式分析的基础上,提出了采用准确有效的纵波、横波超声检测方法,并提出了缺陷评定方法,以确保危险缺陷的检出。