Thesis

Investigation of corrosion protection systems and development of design rules for enhanced corrosion fatigue life in positive displacement pumps

Downloadable Content

Download PDF
Creator
Rights statement
Awarding institution
  • University of Strathclyde
Date of award
  • 2019
Thesis identifier
  • T15455
Person Identifier (Local)
  • 201565679
Qualification Level
Qualification Name
Department, School or Faculty
Abstract
  • The current study comprises an extensive investigation of the effect of cathodic protection on the fluid erosion-corrosion and corrosion fatigue performance of a low alloy steel grade used for the manufacturing of pump components and pipelines, designed to work in severe environmental conditions. The experimental investigation showed that factors such as electrolyte salinity and flowing conditions significantly affect the performance of the material and the behaviour of cathodic protection systems. The adoption of the proper cathodic protection strategies has been seen to eliminate the effect of corrosion and extend the fatigue life to levels observed in dry conditions. The implementation of sacrificial anode cathodic protection using Magnesium alloy sacrificial anodes in low salinity and Zinc alloy sacrificial anodes in high salinity aqueous environments, proved to be successful strategies in mitigating corrosion. The development of a 1-D mathematical model enabled the sensitivity analysis of the behaviour of sacrificial anode cathodic protection systems used in various working conditions. Moreover, design rules have been developed for sacrificial anode cathodic protection systems aimed for the elimination of the effect of fluid erosion-corrosion on the fatigue life of pipelines and positive displacement pumps. The systems designed, based on these rules, were modelled using commercial simulation tools for the prediction of their performance. The findings demonstrate that sacrificial anode cathodic protection can be successfully used for the corrosion protection of such industrial equipment. Finally, the effect of current drain on the performance of sacrificial anode cathodic protection systems, used in positive displacement pumps, due to their electrical connection to pipelines, was investigated using modelling techniques. The results showed that proper design of such systems may dramatically decrease this effect and so enable the designer to avoid the use of electrical insulation systems that would increase the production cost.
Advisor / supervisor
  • MacKenzie, Donald
  • Galloway, Alexander
Resource Type
DOI

Relations

Items

Thumbnail Title Date Uploaded Visibility Actions
file details T15455.pdf 2025-02-24 Public Download