What is the minimum and maximum LP-gas capacities for cylinders requiring overfilling prevention devices?

The minimum and maximum LP-gas capacities for cylinders requiring overfilling prevention devices are outlined in the NFPA 58 code, which stipulates that these devices are mandatory for cylinders that have specific size and capacity limitations.

In this context, the correct choice specifies a minimum capacity of 4.2 gallons and a maximum capacity of 40 gallons. This range is significant because it is designed to ensure safety during the storage and transportation of liquefied petroleum gas. Cylinders falling within this capacity requirement are subjected to potential overfilling risks, thus necessitating the implementation of overfilling prevention devices to avoid hazardous situations associated with excess gas.

These regulations are in place to minimize risks such as leaks or ruptures that could lead to explosive conditions. They aim to ensure that cylinders are safely filled and maintained within specific parameters, contributing to a safer working environment and preventing accidents that may arise from improper handling of LP-gas containers.