压力管道广泛应用于各工业领域和城市管网，按我国《压力管道安全监察规定》，城市公用管道为GB级管道。本文从我国城市埋地压力管道的现状出发，简要阐述了风险分析技术在城市埋地管道安全分析中的应用，旨在促进风险分析技术应用的推广和提高我国城市埋地压力管道的管理水平。

压力管道广泛应用于各工业领域和城市管网，按我国《压力管道安全监察规定》，压力管道可分为长输管道、工业管道和公用管道。本文从我国压力管道的现状出发，简要阐述了风险分析技术在不同管道中的应用，旨在促进风险分析技术应用的推广和提高我国压力管道风险分析管理水平。

This paper discusses the plastic limit load of elbows under combined internal pressure and in-plane closing bending moment. Finite element analysis (FEA) and experiments have been carried out. The results of FEA show that when the ratio of pressure to the limit pressure (P/PL) is smaller than 0.469, the limit moment of elbows increases with the increasing of the pressure; when the ratio (P/PL) is bigger than 0.469, the limit moment of elbow decreases with the increasing of the pressure. The results of FEA are verified by experiments. By fitting the results of FEA, the safety assessment figure for elbow under combined internal pressure and in-plane closing bending moment is drawn. The safety assessment method using the figure is simple and is applicable for the engineering.

Four different topics for high-temperature components, namely the development of the assessment codes for the structural integrity of high-temperature components, the application of continuous damage mechanics and probabilistic damage mode on the life assessment of high-temperature components, the life extension for high-temperature components and a proposed strategy for remanufacturing of high-temperature components were discussed in this paper. These topics should provide some important insights for the design and re-design of high-temperature components.

W. Kent Muhlbauer的指数评分法是一种比较成熟的管道风险评价方法，但该方法还存在不完善之处。通过对此方法加以改进，并将改进后的方法用于南京市城市天然气利用工程高压输气管道的风险评价中，实际应用结果表明，此改进方法的评价结果与相关文献的结果相一致，其表达更明确更直观。