This document provides information about portable fire extinguishers, including their purposes, types of fires they can be used for, and maintenance requirements. It discusses the five classes of fires - A, B, C, D, and E - and the types of extinguishers for each. It also outlines the necessary maintenance, including regular checks of mechanisms, vent holes, caps, and plungers. Extinguishers must be recharged as per manufacturer instructions and hydraulic tests performed every 10 years to ensure proper operation. The overall goal is to understand how to use and maintain portable fire extinguishers onboard ships.