Why should the bleeder valve be opened before opening the hydrant gate during a transition to hydrant supply?

Why should the bleeder valve be opened before opening the hydrant gate during a transition to hydrant supply?

• A. To remove air from the line prior to opening the gate
• B. To pressurize the hydrant
• C. To measure residual pressure
• D. To prime the pump

Answer: (A)

Vent air from the line so water can fill and flow smoothly when the hydrant gate is opened. Opening the bleeder first releases trapped air in the supply line, preventing air locks and reducing the risk of water hammer or losing pump prime when the hydrant gate is opened. Once the line is vented and water begins to flow, you can then open the hydrant gate.

Vent air from the line so water can fill and flow smoothly when the hydrant gate is opened. Opening the bleeder first releases trapped air in the supply line, preventing air locks and reducing the risk of water hammer or losing pump prime when the hydrant gate is opened. Once the line is vented and water begins to flow, you can then open the hydrant gate.