In the context of tank classification, what does 'primary tank' refer to?

The term 'primary tank' in the context of tank classification typically refers to an atmospheric tank used to store liquid. Primary tanks are designed to hold liquids at pressure levels that are equal to the surrounding atmosphere, making them suitable for storing various types of bulk liquids such as water, chemicals, and fuels without the need for pressurization. This classification is important because it dictates how the tank is constructed, regulated, and maintained.

Understanding that primary tanks must conform to specific safety standards and regulations helps ensure they can safely contain the liquids stored within them. In contrast, the other options, such as portable tanks or tanks designated for hazardous waste disposal, refer to different types of storage solutions with distinct purposes and specifications, which do not align with the definition of a primary tank.