Papers by Author: Yan Liu

Abstract: A bellows expansion joint of a refinery cracked within a year of use. Analysis was carried out based on the investigation of the working conditions and environments. Through the macroscopic analysis, chemical components analysis, microstructure analysis and SEM analysis, we drew some conclusions. The high-temperature sulfur corrosion led to the failure directly, while the direct reason was the extra load applied on the joint which was caused by the unreasonable support structure. Preventive measures were proposed at last.

Abstract: Non-Dimensional Design Method (NDDM) for pressure vessels may simplify the design process, reduce the human resource, and it can substitute for the traditional method. The principles and steps of the NDDM were presented. In the method, we constructed two kinds of non-dimension parameters through introducing referenced dimension and pressure. Non-dimensional data of the opening reinforcement structure of pressure vessels were attained. In order to validate the results, two pressure vessels with same structure and different computing pressure and size were designed. The correctness was checked by the present standards. It showed that the NDDM could be applied briefly and reliable.