What is the county standard GPM for a 2 ½" attack line?

The standard gallon per minute (GPM) flow rate for a 2 ½" attack line is typically set at 250 GPM. This standard is based on the operational needs of most fire ground scenarios, where effective fire suppression requires a substantial flow of water. The 2 ½" hose diameter allows for higher water volumes compared to smaller lines, making it suitable for aggressive fire attack situations, where overcoming the heat of the fire rapidly is crucial.

Using a 250 GPM flow rate also takes into account the necessary pressure and nozzle capabilities, ensuring that firefighters can achieve both sufficient reach and effectiveness in their firefighting efforts. This standard flow rate is commonly adopted by fire departments for consistency and efficiency in pump operations and hose management.