Hoselines

Hoselines are lengths of flexible fire hose used to convey water from a source to a fire scene. They are a core element of firefighting tactics, enabling firefighters to apply water or other extinguishing agents directly to the fire. A hoseline consists of the hose, a nozzle at the discharge end, and couplings on the opposite end to connect to water sources or other lines.

Two main categories are commonly described: attack lines and supply lines. Attack lines are smaller-diameter hoses (typically about 1.5 to 2 inches) intended for direct fire suppression and maneuverability. Supply lines are larger-diameter hoses (often 3 to 5 inches) used to transfer water from hydrants or pumpers to an engine, draft site, or to feeder lines. Hoses are typically stored in standard lengths such as 50 or 100 feet.

Construction and materials: most hoses have an inner lining that carries water, a reinforced jacket, and end couplings. Modern hoses often use synthetic jackets (nylon or polyester) with rubber or synthetic linings. Couplings may be of various standards, including National Standard Thread (NST) or Storz, enabling secure, rapid connections.

Operation: to deploy, firefighters connect the hose to a water source, charge the line with water, and advance it to the scene while managing friction loss and nozzle pressure. The nozzle type and setting determine the spray pattern and flow rate. Safe handling, communication, and attention to kinks, leaks, and heat are essential.

Maintenance and standards: hose lines are inspected after use and periodically tested. Fire departments follow standards such as NFPA 1962 for service tests, cleaning, and storage. Regular hydrostatic testing, drying, and proper storage extend life and reliability, while avoiding contamination and mildew.