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20 Cards in this Set
- Front
- Back
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WHP= |
Flow, gpm X TDH, ft/ 3960 |
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What happens if ph is too high |
Scaling in mains |
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What temp is water most dense |
4 degrees C |
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What are the main sources of water hardness |
Calcium magnesium |
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What type of meter meter measures turbidity |
Nephelometric |
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When placing a main in service what is the first test performed |
Flow |
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At what temperature will the fusible plugs in a chlorine cylinder melt |
71-74 degrees C |
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How many samples must be collected after a positive coliform test |
4 |
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One use of polyphosphate in water treatment is |
Keeps iron and manganese in solution |
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What is the recommended free chlorine residual for the farthest point in the distribution system |
0.20 mg/l |
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What causes black staining |
Manganese |
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What is the most effective disinfectant |
Free available chlorine |
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What is used to detect a chlorine gas leak |
Amonia vapor |
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The usual percentage of unaccounted-for water in a fully metered system is |
10-20% |
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At what temperature does chlorine gas freeze |
49.5* F |
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Formula to find how many gallons of chlorine for treatment |
MG x mg/l |
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How many lb of chlorine for treatment |
MG x 8.34 x mg/l |
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If the water in the reservoir drops eight feet what will the head on the pump do |
Increase |
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Dose= |
Demand + residual |
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Residual = |
Total chlorine. Combined+free |
