When testing the priming system, the pump fails to achieve -75 kPa during the vacuum test. What should the operator do?

• A. Restart test after adjustments
• B. Remove the apparatus from service
• C. Record failure and continue
• D. Check gauges for accuracy

Answer: (B)

The test for the priming system verifies that the pump can establish the required vacuum to pull water into the priming chamber. If the vacuum cannot reach -75 kPa, the priming system isn’t capable of creating prime, which can lead to the pump losing prime, running dry, cavitation, or damage when placed back in service. The appropriate action is to remove the apparatus from service until the fault is found and repaired, preventing unsafe operation and potential damage. After securing the unit, inspect the priming line for leaks, blockages, and ensure fittings and seals are intact, and verify gauge accuracy as part of the repair and verification process. Restarting after adjustments or simply recording the failure and continuing isn’t appropriate until the system meets the specification.