Which of the following methods is NOT an acceptable way to transfer Class I and II or Class III liquids from containers exceeding 5.3 gallons?

The method of transferring Class I and II or Class III liquids using gravity is not acceptable because it poses a significant risk of spills and leaks, which can lead to hazardous situations. Gravity transfer does not provide a controlled means of transferring liquids and can result in uncontrolled flow, increasing the potential for accidents and environmental contamination.

In contrast, transferring liquids through safety cans that comply with UL 30 standards ensures that the transfer method adheres to safety regulations designed to minimize risks. An approved closed piping system is engineered to contain the liquids securely and manage pressure, thereby preventing hazards. Using an approved pump also allows for controlled dispensing of liquids, reducing the likelihood of spills and ensuring safe handling. These methods are designed to provide both safety and efficiency when handling flammable or hazardous liquids, adhering closely to established safety protocols.