What is the Reynolds number of medium fuel oil being transported through an 8-inch (200 mm) pipe at a rate of 650 gpm (2460 L/min)? Is the flow laminar or turbulent? Liquid temperature is 70oF (21.1o C)2/3/2021

Take Test: Quiz 3 – FSE 360 Fire Prot Hydr & Water …

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QUESTION 1

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Water is moving at a rate of 1 ft3/sec (28 L/sec) through a 24-inch (600 mm) main. What is the Reynolds

number? Is the ow laminar or turbulent? Liquid temperature is 70oF (21.1o C).

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QUESTION 2

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What is the Reynolds number of medium fuel oil being transported through an 8-inch (200 mm) pipe at a rate

of 650 gpm (2460 L/min)? Is the ow laminar or turbulent? Liquid temperature is 70oF (21.1o C).

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QUESTION 3

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A typical automatic sprinkler system might be designed to deliver 22.5 gpm (85 L/min) through a 1-inch (25

mm) pipe. If the water temperature is 70oF (21.1o C), is the ow laminar or turbulent?

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QUESTION 4

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Use internal pipe diameters and the Hazen-Williams formula with the following C-factors and calculate the

friction loss for the situations described below:

a. Water at 60oF owing at 400 gpm through 1,000 feet of 6-inch unlined cast-iron pipe. C = 100

b. Water at 70oF owing at 1,500 gpm through 600 feet of 8-inch unlined cast-iron pipe. C = 100

c. Water at 70oF owing at 1,725 gpm through one-half mile of 12-inch cement lined cast-iron pipe. C = 140

d. Water at 70oF owing at 300 gpm through 150 feet of 4-inch commercial steel pipe/Sch 40. C = 120

e. Water at 70oF owing at 100 gpm through 15 feet of 2-inch copper tubing type K. C = 150

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QUESTION 5

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Change the following re protection demands in gpm (L/min) into units of millions of gallons (millions of liters)

per day.

a. 500 gpm (1,890 L/min)

b. 1,250 gpm (4,700 L/min)

c. 2,000 gpm (7,560 L/min)

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QUESTION 6

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Transform the following water treatment plant capacities in MGD (MLD) into ow rates in gpm (L/min)

a. 7.3 MGD (27.63 MLD)

b. 9.7 MGD (36.72 MLD)

c. 18.4 MGD (69.65 MLD)

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QUESTION 7

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If a community has a population of 30,000 and consumes water at an average rate of

150 gallons (570 liters) per person per day, what water treatment plant capacity in MGD

(MLD) would be needed to meet the average daily consumption?

QUESTION 8

If a city of 500,000 people consumes water at a maximum rate in the summer of 130

gallons (490 liters) per person per day, what water treatment plant capacity in MGD

(MLD) would be needed to meet the maximum daily consumption?

QUESTION 9

How high would a tank have to be to generate a pressure of 75 psi (5.2 bar) when full?

QUESTION 10

If a tank is 85 feet (25.9 m) high, what city water pressure would have to be maintained

to keep the tank full?

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