Unit 5 Backflow Prevention Test Your
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Knowledge exam with correct answers
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Define |and |briefly |explain |"backflow." |- |ANSWER✔✔✔-The |movement |of |a |liquid |in |reverse |of
|the |normal |direction |of |flow |in |a |piping |system. |Backflow |can |also |occur |in |the |injection |line, |
causing |the |pesticide |tank |to |overflow. |Backflow |results |from |either |backsiphonage |or |
backpressure.
Why |is |backflow |prevention |so |important? |- |ANSWER✔✔✔-To |protect |water |sources |from |
pollution. |Backflow |prevention |is |a |vital |part |of |safe |and |effective |chemigation.
Define |"backsiphonage" |and |name |some |common |causes. |- |ANSWER✔✔✔-A |vacuum |caused |
by |reduced |pressure |in |a |supply |line |to |a |piping |system. |This |vacuum |causes |a |siphoning |
action. |Common |causes |are:
1. |High |liquid |velocity |in |pipelines. |
2. |A |line |break |or |repair |that |is |lower |than |a |service |point.
3. |Lowered |main |pressure |due |to |a |high |rate |of |water |withdrawal |(ex. |fire |fighting). |
4. |Reduced |supply |pressure |on |the |suction |side |of |the |booster |pump.
, Define |"backpressure" |and |name |some |common |causes. |- |ANSWER✔✔✔-A |difference |in |
pressure |when |a |supply |line |is |connected |to |a |high-pressure |system. |If |the |system |exceeds |the
|operating |pressure |of |the |supply |pipes, |backpressure |can |result. |Common |causes |are:
1. |Booster |pumps.
2. |Connections |to |boilers.
3. |Cross |connections |with |another |system |running |at |a |higher |pressure. |
4. |Elevated |piping.
Define |and |briefly |explain |"cross |connection." |- |ANSWER✔✔✔-Any |physical |connection |
between |a |public |water |system |and |any |source |of |nonpotable |liquid, |solid, |or |gas. |The |
connection |can |be |actual |or |potential. |If |this |connection |could |contaminate |the |public |water |
supply |by |backflow, |it |is |a |cross |connection.
What |safety |equipment |must |you |have |if |your |chemigation |system |draws |from |a |domestic |or |
municipal |water |supply? |- |ANSWER✔✔✔-A |reduced |pressure-principle |backflow |preventer |or |
a |two-pump |system |with |an |air |gap.
How |can |you |find |out |what |safety |equipment |is |required |for |chemigation |of |a |pesticide? |- |
ANSWER✔✔✔-Consult |the |label. |Under |federal |law, |pesticide |labels |must |state |which |safety |
equipment |is |required |for |chemigation |of |the |product.
| | | || | |
Knowledge exam with correct answers
| | | |
Define |and |briefly |explain |"backflow." |- |ANSWER✔✔✔-The |movement |of |a |liquid |in |reverse |of
|the |normal |direction |of |flow |in |a |piping |system. |Backflow |can |also |occur |in |the |injection |line, |
causing |the |pesticide |tank |to |overflow. |Backflow |results |from |either |backsiphonage |or |
backpressure.
Why |is |backflow |prevention |so |important? |- |ANSWER✔✔✔-To |protect |water |sources |from |
pollution. |Backflow |prevention |is |a |vital |part |of |safe |and |effective |chemigation.
Define |"backsiphonage" |and |name |some |common |causes. |- |ANSWER✔✔✔-A |vacuum |caused |
by |reduced |pressure |in |a |supply |line |to |a |piping |system. |This |vacuum |causes |a |siphoning |
action. |Common |causes |are:
1. |High |liquid |velocity |in |pipelines. |
2. |A |line |break |or |repair |that |is |lower |than |a |service |point.
3. |Lowered |main |pressure |due |to |a |high |rate |of |water |withdrawal |(ex. |fire |fighting). |
4. |Reduced |supply |pressure |on |the |suction |side |of |the |booster |pump.
, Define |"backpressure" |and |name |some |common |causes. |- |ANSWER✔✔✔-A |difference |in |
pressure |when |a |supply |line |is |connected |to |a |high-pressure |system. |If |the |system |exceeds |the
|operating |pressure |of |the |supply |pipes, |backpressure |can |result. |Common |causes |are:
1. |Booster |pumps.
2. |Connections |to |boilers.
3. |Cross |connections |with |another |system |running |at |a |higher |pressure. |
4. |Elevated |piping.
Define |and |briefly |explain |"cross |connection." |- |ANSWER✔✔✔-Any |physical |connection |
between |a |public |water |system |and |any |source |of |nonpotable |liquid, |solid, |or |gas. |The |
connection |can |be |actual |or |potential. |If |this |connection |could |contaminate |the |public |water |
supply |by |backflow, |it |is |a |cross |connection.
What |safety |equipment |must |you |have |if |your |chemigation |system |draws |from |a |domestic |or |
municipal |water |supply? |- |ANSWER✔✔✔-A |reduced |pressure-principle |backflow |preventer |or |
a |two-pump |system |with |an |air |gap.
How |can |you |find |out |what |safety |equipment |is |required |for |chemigation |of |a |pesticide? |- |
ANSWER✔✔✔-Consult |the |label. |Under |federal |law, |pesticide |labels |must |state |which |safety |
equipment |is |required |for |chemigation |of |the |product.
