| Summary: | 碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 103 === Petrochemical industry in Taiwan flourishingly developed along with the industrial development. However the pipeline systems may be corrosion, leaks, obstruction, or damage after long-term use. Shocked disaster of petrochemical industry such as Kaohsiung Blast accident last August 1, and Mailiao 6th Naphtha Cracking Plant accidents caused huge damage. One cannot overlook the danger of petrochemical pipeline leaking disaster. Corrosion-resistant coating material of pipelines, which were used over 30 year in Da-Lin refinery plant and its cover soil was affected by the sea tide, was scale off when the new pipeline system construction processed. In this study, we the corrosion-resistant coating material were tested to simulate the aging effect and find the reason for scaling off.
Aging test were done by using commercially available 20% concentration of hydrochloric acid and coating material were immersed in this acid solution for 1, 2, 4, 8, 24, and 48 hours. Weight deduction and corrosion depth measurement, tensile strength test
and penetration test were done for each immersion period.
Experimental results display that corrosion depth and weight deduction happened fast at first 2 hours, and the corrosion-resistant coating material became brittle and easily cracked. Tensile strength decreases with the increase of etching time. Penetration index decrease fast from original 12 to 8, and stop at 7 which is the minimum value of the specification. Those experimental results clearly show that corrosion-resistant coating material will lose function after long-term soaking at sea tide environment.
Once petrochemical pipeline leak and cause a fire, it will lead to a major work safety accident. Therefore, it is important to increase environment control before underground pipeline construction and increase inspection frequency after pipeline using. It must have a stratagem to control the pipeline corrosion, consider the related risk, and prepare the anti-corrosion protection to extend the service life and safety of petrochemical pipelines.
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