Final answer:
Fire hydrants should be operated slowly to avoid damaging them and the water system due to water hammer from sudden pressure changes.
Step-by-step explanation:
All hydrants must be opened and closed slowly to prevent damage. It is important to operate fire hydrants in a gradual manner to avoid a surge of water, which can cause a spike in water pressure.
Sudden changes in water pressure can result in what is known as a water hammer, potentially damaging the hydrant itself, the water mains, and connected infrastructure. By opening and closing a hydrant slowly, one ensures the safety of the water system and the longevity of the hydrant equipment.