What is the primary difference between stored pressure and cartridge-operated extinguishers?

The primary difference between stored pressure and cartridge-operated extinguishers is that stored pressure extinguishers are maintained at a certain pressure continuously, which means they are always ready for use. They contain a pressurized agent within the same canister that also holds the extinguishing agent. This makes them simple and quick to deploy; when the nozzle is directed at the fire, the pressure releases the agent for immediate action.

On the other hand, cartridge-operated extinguishers utilize a separate cartridge that must be punctured to release the pressurized extinguishing agent. This type of extinguisher is typically more versatile for particular applications because it can allow for varying levels of pressure depending on the cartridge used, offering a distinct method of activation compared to the continuous pressurization of stored pressure models. This distinction is crucial for understanding the operational differences and appropriate contexts for each type of extinguisher.