For how long should the pressure be maintained after the proper test pressure for a fire hose is reached?

Maintaining the pressure for three to five minutes after reaching the proper test pressure for a fire hose is critical for ensuring the integrity and reliability of the hose. This duration allows for adequate assessment of the hose's ability to withstand the specified pressure without any signs of failure, such as leaks or bulging.

During this testing period, firefighters or technicians can closely observe the hose for any signs of weakness that could indicate a potential failure under operational conditions. Ensuring a thorough examination within this timeframe is essential in confirming that the hose can safely be used in emergency scenarios.

While shorter durations may not provide sufficient time for thorough observation of the hose's performance, longer durations could lead to unnecessary delays and possibly cause wear on the hose itself. This balance of time is what makes the three to five minutes the most appropriate choice for ensuring hose safety during testing.