The dry barrel hydrant should be completely opened when is use to

• A. Ensure the drain valve is completely closed
• B. Open slowly to prevent splashing
• C. Fully rotate the hydrant to open
• D. Check the drain after opening

Answer: (A)

In a dry-barrel hydrant, the base has a drain that is designed to let the hydrant barrel drain when it’s not pressurized. To get full, reliable flow when you start using the hydrant, the drain valve must be kept closed. If the drain valve is left open, water can escape through the drain as you draw from the hydrant, causing a drop in pressure and reduced discharge. Opening the hydrant to use it achieves maximum flow only when the drain valve is completely closed, so all the supply goes to the outlet. After you’re done, the drain valve will drain the barrel to prevent freezing. The other options describe timing or methods that aren’t the critical step for achieving proper discharge during use.