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Landscape Irrigation > Backflow Section > Flashcards

Backflow Section Flashcards

1
Q

Which devices can stop backsiphonage

A

PVB, DCA, RP and AVB

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2
Q

Which devices can stop backpressure

A

DCA and RP

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3
Q

Which device can handle constant pressure?

A

RP, DCA, and PVB

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4
Q

Which device, or devices, are approved when there is chemical applied by aspiration, injection, or emission?

A

RP

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5
Q

If there is an on-site sewage facility on site, which backflow is approved?

A

RP

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6
Q

If major maintenance has to be performed, which backflow device has to be properly installed prior to the repair work being performed?

A

An approved backflow device.

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7
Q

The approved backflow devices for non-health hazards include:

A

All devices (AVB, PVB, DCA, and RP)

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8
Q

If including a master valve, where does it have to be installed?

A

Downstream from the PVB, DCA, or RP.

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9
Q

Which devices have to be tested upon installation and annually?

A

Devices used in applications designed as health hazards.

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10
Q

Which backflow devices have to be tested upon installation?

A

All backflow devices.

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11
Q

If a DCA is installed below ground, what device is installed?

A

A Y-strainer installed on inlet side of the DCA.

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12
Q

If there is an additional water source supplying water to a system being supplied by a potable water supply, what device has to used with the potable water supply?

A

RP

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13
Q

What device cannot be used when there is a health hazard?

A

DCA

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14
Q

An AVB and PVB can be used in health hazard situations, if the following conditions are not present:

A

Backpressure
There is a pump downstream
Chemicals added

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15
Q

An atmospheric vacuum breaker (AVB):

A

Has to be installed 6” higher than the highest head or outlet in the retracted position, will not handle constant pressure, and will stop backsiphonage.

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16
Q

What is the unwanted reversal of water flow in an irrigation system?

A

Backflow

17
Q

A cross connection is any actual or potential connection between a potable water supply and:

A

Any source that has the possibility to introduce polluted or contaminated water back into the potable water that is supplying it.

18
Q

Backsiphonage is caused by:

A

Negative or sub-atmospheric pressure.

19
Q

Backsiphonage can be caused by:

A

A break in the city main.

The fire department using water from the city fire hydrant to put out a fire.

20
Q

If the pressure in the sprinkler system (or downstream side) exceed the pressure in the supply side, what phenomenon can occur?

A

Backpressure

21
Q

What can cause backpressure?

A

Gravity or a pump.

22
Q

How many total ways are there to protect against backpressure and/or backsiphonage?

A

5

23
Q

What is the unobstructed vertical distance through free atmosphere between the lowest point of a water supply outlet and the flood level rim of the fixture or assembly into which the outlet discharges?

A

An air gap

24
Q

The vertical, physical separation, of an air gap must be:

A

At least twice the diameter of the water supply outliet, but never less than 1 inch.

25
Q

What is a typical example of an air gap?

A

Kitchen sink.

26
Q

What is the maximum number of hours an AVB can have constant pressure?

A

12

27
Q

How high does a pressure vacuum breaker have to be installed?

A

12” above the highest head or outlet in the retracted position.

28
Q

How many test cocks does a PVB, DCA, and RP have, respectively?

A

PVB: 2
DCA: 4
RP: 4

29
Q

If the highest head a the site is shrub spray on a 12” riser, how high would a PVB have to be installed right next to that head?

A

24”

30
Q

Which backflow devices incorporate two check valves?

A

DC and RP

31
Q

Which backflow device can be installed below grade (local regulation permitting)?

A

DC

32
Q

Which backflow device uses a pressure differential relief valve and has to be installed 12” above grade?

A

RP

33
Q

There are two ball valves on which of the following?

A

DC and RP

34
Q

The phenomenon that causes water to backflow due to elevation or a pump is called:

A

Backpressure

Landscape Irrigation (4 decks)

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