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Backflow Prevention > Chapter 6, Field Testing > Flashcards

Chapter 6, Field Testing Flashcards

1
Q

Mechanical backflow prevention assemblies must be field tested at

A

Once a year, annually

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2
Q

Test gauges should have their accuracy verified at least

A

Once a year

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3
Q

This type of gauge can be used to test, reduce pressure, principal assemblies, double check, valve assemblies, pressure, vacuum, breakers, and spill resistant vacuum breakers

A

A differential pressure gauge

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4
Q

For a DCVA, differential pressure gauge measures pressure differentials between the ______ side and _____ side of a _____ valve

A

High, Low, check

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5
Q

True or false. The general design of the differential pressure gauge must include three pressure hoses and two, three, or five needle valves.

A

True

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6
Q

The gauge itself measures the difference in pressure between the____ and the______

A

Low pressure hose, high-pressure hose

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7
Q

These are used to remove air from the backflow preventer and the test gauge

A

Bleed valves

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8
Q

As soon as the test cocks are open, the gauge is:

A

Online

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9
Q

True or false water is always supplied to both sides of the gauge, no matter which test gage needle valves are open or closed

A

True

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10
Q

When the bleed valves are open water forces air out of

A

The bleed line

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11
Q

The control valves are used during the testing to control the ______ of water from the high-pressure hose to the low pressure hose

A

Bypass

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12
Q

When testing the pressure vacuum breaker assembly the differential pressure gauges used to ensure that the air inlet valve opens at:

A

1.0 psi or greater

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13
Q

For a pressure vacuum breaker, the single check valve in the pressure vacuum breaker assembly must hold tight against

A

1.0 psi in the direction of flow

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14
Q

When testing the double check valve, the differential pressure gauge is used to test the assembly to check that each check valve closes when water is moving through the check assembly. This is also called a:

A

Direction of flow test

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15
Q

When testing a reduced pressure assembly, the differential pressure gauge is used to verify that check valve number one will maintain a pressure differential of at least:

A

5.0 PSI

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16
Q

A site tube is used on a:

A

Double check valve assembly

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17
Q

Once the site tube is attached to the TC it is filled with water to a minimum height of

A

28 inches

18
Q

The disadvantage of the site tube is that it cannot be used if there is not enough

A

Adequate space (at least 28 inches)

19
Q

Test results from the site to only indicate:

A

Pass or fail

20
Q

When testing with a tube, the tester must wait

A

Two minutes for the water to stabilize

21
Q

Double check valve assemblies must hold drip tight against:

A

1.0 psi in the direction of flow

22
Q

Any problems with the assembly due to vandalism or whether also should be noted on the form in a

A

Comments or remark section

23
Q

Evidence of _____ include wet spots, tall grass, moss, or algae growth, erosion, or puddled water around the assembly

A

Leaks

24
Q

Prior to any backflow preventer testing, the customer should be

A

Notified

25
Q

These types of installations allow one backflow preventer to be tested while the other is still in service

A

Parallel installations

26
Q

True or false duplex, pressure gauges are frequently used in the United States

A

False

27
Q

Accurate readings on the differential pressure gauge can only be accomplished during a

A

No flow condition (static)

28
Q

Leaking check valve number two on an RP should show a value of

A

Zero PSI on the gauge

29
Q

The differential pressure across check valve number one in an RP should be at least

A

5.0 psi

30
Q

The relief valve opening point on an RP should be at least

A

2.0 psi or above

31
Q

This test on an RP shows a differential pressure reading across:

A

Check valve number one

32
Q

This test shows what on an RP

A

The opening point of the relief valve

33
Q

This test shows how to:

A

Test an RP with a leaking outlet shut off valve

34
Q

This test is used to determine that:

A

Check valve number two on an RP will hold tight against back pressure

35
Q

This test is used to confirm that:

A

The outlet shut off valve is not leaking

36
Q

This test is used to determine the differential pressure across

A

Check valve number two

37
Q

This test is used to check what on a double check valve assembly:

A

Checking the tightness check valve number one

38
Q

This test is used to determine the tightness of what on a double check valve assembly

A

The tightness of check valve number two

39
Q

Check valve #one and check valve #2 should hold at

A

One PSI or greater

40
Q

This test shows what on a pressure vacuum breaker:

A

The opening point of the air inlet valve

41
Q

This test shows what on a pressure vacuum breaker:

A

Verifying that the single check of a PVV will Hoback 1.0 psi in the direction of flow 

42
Q

The low bypass control must not be open more than

A

1/4 turn

Backflow Prevention (11 decks)

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