Xie Dongbai, Hong Hao, Duo Shuwang, Li Qiang, Su Jianmin
{"title":"Visual and oxide analysis for oil-filled heater fire scene","authors":"Xie Dongbai, Hong Hao, Duo Shuwang, Li Qiang, Su Jianmin","doi":"10.1680/jfoen.21.00027","DOIUrl":null,"url":null,"abstract":"This study demonstrates the use of visual and oxide analyses to identify the cause of an actual electrical fire. Three severely oxidized electric oil-filled heaters and heating elements located at different locations were discovered in the debris of a megamall fire. According to visual analysis, the steel fins exhibited signs of overheating and the presence of large amounts of iron oxidation, denoting that the fins were the probable ignition source. Metallographic analysis showed that oxidation inside the oil-filled heaters at the fire site was also severe. Moreover, the temperature-dependent wear of the metal parts provided new evidence about the exposure temperature of the fire. The microstructure of the oxide scale of metallic materials was also temperature dependent, indicating that metallurgical characterization will greatly complement the conventional evidence collection via macroscopic visual examination.","PeriodicalId":42902,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Forensic Engineering","volume":null,"pages":null},"PeriodicalIF":0.4000,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the Institution of Civil Engineers-Forensic Engineering","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1680/jfoen.21.00027","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}
引用次数: 0
Abstract
This study demonstrates the use of visual and oxide analyses to identify the cause of an actual electrical fire. Three severely oxidized electric oil-filled heaters and heating elements located at different locations were discovered in the debris of a megamall fire. According to visual analysis, the steel fins exhibited signs of overheating and the presence of large amounts of iron oxidation, denoting that the fins were the probable ignition source. Metallographic analysis showed that oxidation inside the oil-filled heaters at the fire site was also severe. Moreover, the temperature-dependent wear of the metal parts provided new evidence about the exposure temperature of the fire. The microstructure of the oxide scale of metallic materials was also temperature dependent, indicating that metallurgical characterization will greatly complement the conventional evidence collection via macroscopic visual examination.