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- W18662769 abstract "published has emphasized that the flash point of the material stored is the most important factor in determining if enough fuel is present in the vapor space for combustion.¹¯³ Dimpfl 4 concluded that factors unrelated to simple evaporation of asphalt are common causes of the buildup of combustibles in asphalt tanks. He cited smoldering coke deposits on the inner roof and shell of the tank, incidental thermal cracking, light hydrocarbons from solvent deasphalting (SDA) processes, contamination from crude feed/vacuum residuum heat exchanger leaks, and unstripped light hydrocarbons generated during air blowing as being potential sources of vapor space fuel not detected by flash point tests. He emphasized smoldering coke’s role in depleting oxygen and elevating carbon monoxide and carbon dioxide in the tank vapor space, and pointed out its potential as an ignition source, with or without the catalyzing effect of iron sulfide. However, based on his sampling of nine tank vapor spaces, Dimpfl was not able to predict what material and storage conditions tended to give explosive vapor spaces. His final conclusion was that the storage of asphalt is an unpredictable art. The work described in this article was undertaken to build an understanding of the factors affecting the accumulation of combustible vapors in tanks storing various types of asphalt. The key to this effort has been an extensive tank vapor space-monitoring program in which we have developed simple methods of evaluating asphalt tank vapor-space compositions. The methods are currently being used in our manufacturing facilities to define specific tank hazards, thus providing us with an ever-expanding data base to aid in predicting and controlling high-risk situations. This in-plant testing is being complemented by lab evaluations of materials, development of new testing methods, and moresophisticated characterization of actual vapor spaces. A verification of the accuracy of the simpler tank-monitoring methods has been completed, and that work is being prepared for publication." @default.
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- W18662769 date "1989-09-18" @default.
- W18662769 modified "2023-09-24" @default.
- W18662769 title "Better understanding needed for asphalt tank-explosion hazards" @default.
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