In the forward flow test, what is the specified pressure at the base of the riser?

In the forward flow test, what is the specified pressure at the base of the riser?

• A. 42 psi
• B. 50 psi
• C. 60 psi
• D. 75 psi

Answer: (A)

Forward flow testing checks how the water supply behaves under flowing conditions, specifically what pressure remains at the base of the riser when flow is drawn through the system. The test protocol uses a baseline of 42 psi at that point so the results reflect a consistent reference that accounts for typical friction losses and elevation effects. This helps confirm the supply can deliver the required pressure to the system’s outlets during demand and provides a standard to compare across installations. If the base-of-riser pressure deviates from 42 psi, it signals potential issues with the water supply, pump performance, or piping losses. The other pressures listed do not match the standard baseline used for this forward flow test.

Forward flow testing checks how the water supply behaves under flowing conditions, specifically what pressure remains at the base of the riser when flow is drawn through the system. The test protocol uses a baseline of 42 psi at that point so the results reflect a consistent reference that accounts for typical friction losses and elevation effects. This helps confirm the supply can deliver the required pressure to the system’s outlets during demand and provides a standard to compare across installations. If the base-of-riser pressure deviates from 42 psi, it signals potential issues with the water supply, pump performance, or piping losses. The other pressures listed do not match the standard baseline used for this forward flow test.