Which outcome best describes the risk when dead-heading occurs due to valve misalignment?

• A. Decreased discharge pressure.
• B. Increased risk of pump damage and reduced system availability.
• C. Faster system startup.
• D. Better energy efficiency.

Answer: (B)

When a pump runs with dead-head due to valve misalignment, the pump is effectively operating with little to no discharge flow. The main risk is pump damage and reduced system availability. Without flow, the pump can’t shed heat, so temperature inside the pump, seals, bearings, and impeller rises. This overheating and the resulting mechanical stress can lead to seal and bearing failure, impeller damage, and even motor overload or electrical troubles. All of that undermines the pump’s reliability exactly when it’s needed most, reducing system availability during a fire event.

Other outcomes don’t capture the primary danger. Dead-heading doesn’t imply lower discharge pressure as the critical issue; it often coincides with high pressure buildup upstream and no flow. It also won’t improve startup speed or energy efficiency—quite the opposite, since energy is being wasted with no useful flow and increased risk of damage.