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24 Cards in this Set
- Front
- Back
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Chlorine, (Cl2) Dangerous at _____ to ______ ppm in 30 min. At _____ to _____ ppm apt to be fatal in a few breaths. |
40 to 60 ppm, 1,000 ppm |
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Hydrogen sulfide (H2S) Death in a few min. At ____% |
0.2% |
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Oxygen (O) Normal _____% If less than ______% do not enter space without respiratory protection |
20.93%, 19.5% |
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Oxygen above ____% concentration speeds up combustion. |
23.5% |
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The most common toxic gas is _____ _____. |
Hydrogen sulfide |
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The loss of ability to smell hydrogen sulfide is called ______. |
Olfactory Fatigue |
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MSDS |
Material safety data sheet |
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Chemicals classified as hazardous must be identified at concentration of ____% |
1.0% |
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Cancer-causing chemicals must be identified at concentrations of ____% |
0.1% |
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What do UEL and LEL stand for? |
UEL- upper explosive limit LEL- lower explosive limit |
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TWA |
Time weighted average- exposure to 85 decibels equal to or over 8 hr. |
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SCBAs |
Positive-pressure self-contained breathing apparatus |
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SARs |
Positive pressure supplied air respirators |
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What type of fire extinguisher should be used in a pump station? |
All-purpose, ABC chemical type |
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A _____ or _____ deposit indicates a chlorine leak. |
Green or reddish deposit |
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Only ____ lbs of chlorine should be removed from a day from a chlorine cylinder because of the danger of freezing and reducing the chlorine flow. |
40 lbs |
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Screens should be cleaned befor the head loss reaches _____. |
3 in. |
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Screens should be inspected _______ for indicators of malfunctions. |
Daily |
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Gravity pulls particles of grit down. ____ pushes grit forward. |
Velocity |
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Grit classifies remove excess water from the grit and return _______ to the wastewater. |
Organics |
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Flow-proportional weird are used in velocity control horizontal flow grit basins to ..... |
Maintain a constant velocity |
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It takes ____ lbs of O for every __ lb of ammonia converted to nitrate. |
4.5 lbs, 1lb |
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It takes ____ lbs of O for every __ lb of ammonia converted to nitrate. |
4.5 lbs, 1lb |
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Domestic wastewater soluble BOD is ___ to ____% |
20 to 40% |
