Which function does the hose liner of a jacketed fire hose serve?

The hose liner of a jacketed fire hose functions primarily as the waterproof layer, which is crucial for maintaining the integrity of the hose during firefighting operations. This liner is designed to prevent water from seeping through the outer layers, ensuring a reliable and effective flow of water to combat fires. Having a waterproof layer also protects against environmental factors, such as moisture and contaminants, that could compromise the hose's performance.

Understanding the role of the hose liner is essential, as it directly affects the efficiency of water delivery in emergency situations. A properly functioning liner helps ensure that the hose can withstand the pressure of high-volume water flow without leakage, which is vital for the safety and success of firefighting efforts.