Study of erosion mechanism in piping system

Pao Yue-kong Library Electronic Theses Database

Study of erosion mechanism in piping system

 

Author: Chow, Fo-shing
Title: Study of erosion mechanism in piping system
Degree: M.Sc.
Year: 2000
Subject: Pipelines -- Corrosion
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Mechanical Engineering
Pages: 63 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1532174
URI: http://theses.lib.polyu.edu.hk/handle/200/3839
Abstract: In this dissertation, the study is focused on the ductile erosion under ambient conditions, while the brittle material have completely different erosion mechanisms. Three approaches have been taken in the investigation: phenomenological modeling, physical formulation, and experimental study of piping system in site service. In the phenomenological models are derived from a sequence of erosion events as observed directly by the electron microscopy. Predominantly, the scanning electron microscopy (SEM) is taken to study the erosion process. The existing observations indicate that the erosion process is directly coupled with conventional metal deformations including extrusion, pancake forging, bending and fracture. The physical models take the form of a mathematical expression, and they can be analytical, or numerical, or a combination of both. The main physical models developed between 1958 and 1989 are critically studied and reviewed. Comparing the physical models with experimental data, it is found that the best correlation can be achieved with the use of Beckmann & Gotzmann's erosion model. Finally, I have carried out an experiment on an ash conveying piping system in Lamma Power Station of Hong Kong Electric Co. Ltd. Through this experiment, I have further assessed the applicability of the physical models in realist operating conditions.

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