What is the standard unit used to express the flow rate for an FDC inlet?

What is the standard unit used to express the flow rate for an FDC inlet?

• A. GPM
• B. PSI
• C. CFM
• D. RPM

Answer: (A)

Flow rate is expressed in gallons per minute when describing how much water can be delivered into an FDC inlet. This unit communicates the amount of water that can pass through the connection per minute, which is the critical measure for fire protection since the system must meet demand quickly. Pressure is measured in psi, which tells how hard the water is being pushed, not how much water flows per minute. CFM measures air or gas volume flow, not liquid water. RPM relates to rotating parts, not flow. Therefore, the standard unit for the FDC inlet flow rate is gallons per minute.

Flow rate is expressed in gallons per minute when describing how much water can be delivered into an FDC inlet. This unit communicates the amount of water that can pass through the connection per minute, which is the critical measure for fire protection since the system must meet demand quickly. Pressure is measured in psi, which tells how hard the water is being pushed, not how much water flows per minute. CFM measures air or gas volume flow, not liquid water. RPM relates to rotating parts, not flow. Therefore, the standard unit for the FDC inlet flow rate is gallons per minute.