Under what condition is a fire pump not required to supply the manual wet standpipe system to the most remote hose connections?

• A. When the water supply can provide 100 gpm at 65 psi to the most remote 1/2 in. hose connection.
• B. When the standpipe is not required to be connected to a water supply.
• C. When a booster pump is installed to support the system.
• D. When the most remote hose connection is larger than 2 inches.

Answer: (B)

The need for a fire pump is driven by the requirement to deliver adequate pressure and flow to the most remote hose connections when the standpipe is connected to a water supply. If the standpipe is not required to be connected to a water supply, there’s nothing for the pump to provide, so a fire pump isn’t required for that system. In other scenarios, where water supply is required, a pump would be used to overcome pressure losses and meet the minimum flow at the farthest outlet. The other options describe conditions that still involve supplying or boosting water pressure, or do not remove the need for a pump.