1.

The drawing following this question shows a layout of underground piping to a facility. All hydrants shown in Figure 7-2 are at the same elevation. The C factor of the 6 in. pipe has been determined to be 80 while that of the 10 in. pipe is 100.

1. For this question only, valve D is closed. A hydrant flow is taken at Hydrant H-6. Pressure is monitored at Hydrant H-7. Test results show a static pressure of 62 psi and a flow of 800 gpm available at a residual pressure of 55 psi at H-7. What would the residual pressure be available at H-6 if Hydrant H-4 were flowing 1250 gpm?

   1. 15

   2. 25

   3. 35

   4. 45

2. From the lead-in connection to the loop, the 6 ? leg has an equivalent length of 1180 feet to Hydrant H-4. The 10 ? leg has an equivalent length of 1040 feet. The estimated flow in the 6 ? leg (gpm), when 1500 gpm is being flowed from Hydrant H-4, is most nearly:

   1. 250

   2. 500

   3. 750

   4. 1000

3. The lead-in from the city connection to the loop has 100 linear feet of 10 ? pipe, one tee, 4 standard elbows, three gate valves and a detector check valve with a pressure drop of 3 psi at 2000 gpm. A flows of interest are near 2000 gpm. The equivalent length of the lead-in (feet) at this flow, including the check valve, is most nearly:

   1. 150

   2. 200

   3. 250

   4. 300

4. For this question...