What is the minimum fire extinguisher requirement for a cargo tank motor vehicle?

The minimum fire extinguisher requirement for a cargo tank motor vehicle, according to NFPA 58, is indeed 18 pounds. This specification is in place to ensure that in the unfortunate event of a fire incident, the vehicle is equipped with an adequate means to suppress small fires that may arise, potentially preventing greater damage and ensuring the safety of the vehicle and its cargo.

An extinguisher of this weight typically contains a higher capacity of extinguishing agent, allowing for longer use and more effective suppression of fires compared to lighter options. The choice of 18 pounds aligns with established safety standards aimed at protecting both responders and the public.