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20 Cards in this Set
- Front
- Back
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How many gallons of a sodium hypochlorite solution containing 5% available chlorine should be added to 50 gallons of water in a chlorine chemical solution tank to prepare a 200 mg/L solution of chlorine? |
0.2 gallons |
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How many pounds of chlorine are needed to disinfect 100,000 gallons of water in a water storage tank at a chlorine concentration dose of 4 mg/L? |
3.3 pounds |
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How many gallons of hypochlorite (5% available chlorine) have to be added to 100 gallons of water to produce a 120 mg/L chlorine solution? |
0.24 gallons |
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A pressure gauge on a fire hydrant reads 60 feet of pressure head. What is the pressure in pounds per square inch? |
26 psi |
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What is the upward force on the bottom of an empty underground tank caused by ground water depth of 5 feet above the tank bottom? The tank is 5 feet wide, 12 feet long, and 8 feet high |
18,720 lbs F=62.4 x H x A F= upward force in pounds H= Head of water on the tank bottom in feet A= Area of bottom of tank in square feet |
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What is the chlorine feed rate in pounds per day to treat a flow of 0.30 MGD at a chlorine dose of 3 mg/L? |
7.5 pounds a day |
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What is the chemical feed in pounds of chlorine per day from a hypochlorinator if the hypochlorite solution is 1.5% or 15,000 mg chlorine per liter? During the test run, the Hypochlorinator delivers 500 mL during 15 minutes |
1.6 lbs/day |
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What is the actual leakage in GPD/mi-in from a new section of pipe if the leak rate during the test period was 50 GPD? The section tested is 0.30 miles long and the pipe diameter is 15 inches |
11 GPD/mi-in |
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What is the flow velocity and feet per second in a 12 inch diameter pipe when the flow rate is 2.5 cubic feet per second? |
3.2 ft/sec |
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What is the water flow rate in a 10 inch diameter pipe in gallons per minute when the flow velocity is 1.2 ft./s? (always convert inches to feet first) |
292 GPM |
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A 6 inch main is to be flushed at a velocity of 6.5 ft./s. What should be the reading on the flow meter in gallons per minute? |
570 GPM |
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During a test of a totalizing flowmeter, the water depth rose 15 inches in a tank 18 inches in diameter. What was the total flow in gallons? |
17 gallons |
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What horsepower must a pump deliver to water that must be lifted 100 feet when the flow is 100 gallons per minute? |
2.53 HP |
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How many kilowatt hours per day are required by a pump with a motor input horsepower of 35 hp when the pump operates 8 hours per day? |
209 kWh/day |
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What is the wire to water efficiency of a pump if the water horsepower is 60 hp and the electrical power input is 80 hp? |
75% |
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What should be the chlorine dose of a water that has a chlorine demand of 2.4 mg/L if a residual of 0.4 mg/L is desired? |
2.8 mg/L |
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What should be the setting on a chlorinator if a pump delivers 700 gallons per minute (assume 1 MGD) and the desired chlorine dose is 3.0 mg/L? |
25 lbs chlorine/24 hrs |
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Water from a well is being disinfected by a Hypochlorinator. If the hypochlorinator is set at a pumping rate of 50 GPD and uses a 5% available chlorine solution, what is the chlorine dose rate in mg/L? The pump delivers 250 GPM. |
6.9 mg/L |
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Water from a well is being disinfected by a Hypochlorinator. If the hypochlorinator is set at a pumping rate of 50 GPD and uses a 5% available chlorine solution, what is the chlorine dose rate in mg/L? The pump delivers 250 GPM. |
6.9 mg/L |
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A 10 inch diameter water main 500 feet long needs to be disinfected. An initial chlorine dose of 400 mg/L is expected to maintain a chlorine residual of over 300 mg/L during the three-hour disinfection period. How many gallons of 5.25% sodium hypochlorite solution will be needed? |
15.5 gallons |
