What total flow is required for the forward flow test when the system specifies 312 gpm at 42 psi with a 250 gpm outside hose allowance?

What total flow is required for the forward flow test when the system specifies 312 gpm at 42 psi with a 250 gpm outside hose allowance?

• A. 562 gpm
• B. 312 gpm
• C. 762 gpm
• D. 812 gpm

Answer: (A)

In a forward flow test, you must meet the total water flow the system is required to deliver, plus any water that will be used by outside hoses during testing. Here, the system demands 312 gpm, and the outside hose allowance is 250 gpm. Add them together to get the total flow the test must achieve: 312 + 250 = 562 gpm. The specified pressure of 42 psi is the target at which this total flow should be delivered, but it doesn’t change the arithmetic. So the required total flow is 562 gpm.

In a forward flow test, you must meet the total water flow the system is required to deliver, plus any water that will be used by outside hoses during testing. Here, the system demands 312 gpm, and the outside hose allowance is 250 gpm. Add them together to get the total flow the test must achieve: 312 + 250 = 562 gpm. The specified pressure of 42 psi is the target at which this total flow should be delivered, but it doesn’t change the arithmetic. So the required total flow is 562 gpm.