Zeng Shunpeng

Corrosion of welded joints of bimetallic composite tube in simulated offshore gas field environment

Purpose – The purpose of this investigation was to research the corrosion behavior of welded joints of bimetallic composite tube (X65/316L) welded with Inconel 625 in simulated sea water and in simulated production water, respectively. Design/methodology/approach – The different electrochemical corrosion and galvanic corrosion behaviors of different welded zones were identified using the dynamic potential scan method and galvanic corrosion technique. Findings – The heat-affected zone (HAZ) of welded joints was the most critical zone for corrosion. The closer to the welding line, more severe was the corrosion that was evident in the HAZ at room temperature. In welded joints of X65 tested in simulated seawater, tremendous corrosion occurred in the HAZ, followed by the base metal, and finally the welding line. However, there were few differences in corrosion of the different zones of welded joints in 316L in simulated production water. In such joints of 316L, corrosion comparatively attacked more easily to t...

Study on Safety Assessment of Gas Station Based on Fuzzy Theory

Gas Station safety is non-linear systems that refer to many factors and multilayer. There are much flammable and explosive compressed natural gas in gas station, and it is considered as a kind of major hazard source. Therefore, the safety assessment of gas station has their special important and realistic significance. Based on the types of accident and risk factors, a new index system of safety assessment was set up. The weight of the evaluation index would be analyzed by analytic hierarchy process, and then the matrix of evaluating results could be calculated through fuzzy comprehensive evaluation. At last, the grade of safety for gas station could be obtained. This Safety Assessment Model can be applied for every gas station.