What is the maximum quantity allowed in a single portable tank for liquids in categories 2/3/4?

• A. 25 gallons
• B. 120 gallons
• C. 660 gallons
• D. 1000 gallons

Answer: (C)

Focus on how containment size relates to safety when handling hazardous liquids. Portable tanks are designed for ease of transport and quick response in spills, so there are hard limits on how much liquid a single tank can hold, depending on the hazard level of the liquid. For liquids classified in categories 2, 3, or 4, the maximum amount allowed in one portable tank is 660 gallons. This limit helps keep the potential release within a size that fire teams and emergency responders can manage, reduces the heat and vapor load from a spill, and keeps handling and containment practical for typical facilities. If more than 660 gallons are needed, a different type of packaging or additional safety measures are required, reflecting the higher hazard and the need for enhanced controls.