Which action is a direct part of the post-operation shutdown to prevent hose movement?

• A. Secure lines
• B. Document results
• C. Reduce throttle
• D. Calibrate gauges

Answer: (C)

During post-operation shutdown, the goal is to stop water flow and energy in the system so hoses stop moving and can be secured safely. Lowering the throttle to idle directly achieves this by reducing pump output and pressure in the attack and supply lines. With the pressure down, hoses are less prone to whipping or shifting as you disconnect or secure them. Securing lines is important, but it’s something you do after the throttle is reduced and the system is stabilized. Documentation of results and gauge calibration are procedures for records and maintenance, not the action that directly prevents hose movement during shutdown.