What is the correct sequence of actions when connecting a hydrant supply to a pumper for a direct fire attack?

• A. Position apparatus, connect supply line to hydrant and to the pump intake, open hydrant gradually, bleed air, prime the pump, and monitor suction and discharge pressures.
• B. Position apparatus, connect supply line to hydrant first, then to the pump intake, gradually open hydrant, bleed air, and monitor suction and discharge pressures.
• C. Position apparatus, open hydrant gradually, connect supply line to hydrant and to the pump intake, bleed air, and monitor suction and discharge pressures.
• D. Position apparatus, connect supply line to hydrant and to the pump intake, open hydrant gradually, bleed air, prime the pump, and monitor suction and discharge pressures.

Answer: (D)

The sequence is designed to get water to the pump quickly while making sure the pump is filled with water and free of air before it starts delivering flow. Start by securing the apparatus and then connect the supply line to both hydrant and pump intake. Having both ends tied in before the hydrant is opened prevents pulling air into the pump and avoids delays or air locks once the hydrant is opened. Next, open the hydrant gradually to let water fill the line and the pump, controlling the water hammer that can occur with a sudden surge. After the line and pump are filling, bleed the air from the system so any trapped air is released and the lines become fully water-filled. With the line primed of air, prime the pump so it’s full of water and ready to develop suction. Finally, monitor suction and discharge pressures to confirm a solid prime and proper pump operation as the attack line is pressurized.