Southwest Research Institute (SwRI) has been awarded a two-year, $650,000 contract from the U.S. Department of Transportation to study the risks posed by gases dissolved in hazardous liquids during transport, reports Eurekalert.
Regulations for distinguishing hazardous liquids and gases
The federal government has well-defined quantitative criteria and regulations for distinguishing hazardous liquids and gases as well as how and in what materials they can be transported. Some of the properties that distinguish these liquids and gases are their initial boiling point and degree of flammability, respectively.
“The regulations related to the transportation of hazardous chemicals such as crude oil or gasoline are very different from those for transporting milk,” said SwRI Fluids Engineering Department Research Engineer Dr. Swanand Bhagwat, who leads the project. “However, the Department of Transportation lacks regulatory language to classify the liquids containing significant quantities of dissolved gases. Current regulations do not provide guidelines on how much gas can be dissolved in liquid without changing the hazard classification of the fluid.”
The gap in regulations creates challenges such as discrepancies in handling and selection of appropriate shipping containers, and enforcement of compliance issues when it comes to transporting these fluids.
Additionally, the presence of gases such as methane and ethane in crude oil or dissolved air in fuels such as diesel and kerosene could increase the vapor pressure and the volatility of the liquids and form an ignitable mixture in the tank being transported.
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