Cross Connection Ilms

Front 1

Backflow is defined as

Back 1

Unwanted flow of non potable water, used water, gas, industrial fluids etc into a potable water system.

Front 2

Back siphonage is_____

Back 2

A reversal of the normal direction in flow in a water supply line due to a negative pressure or vacuum being created in the system.

Front 3

List 10 Back siphonage preventers

Back 3

Air gaps

Atmospheric Vacuum breakers

Pressure vacuum breakers

Dual check Backflow preventers

Dual check Backflow preventers with atmospheric port

Dual check Backflow preventers with vent

Double check valve assembly

Hose connection vacuum breakers

Reduced pressure principal Backflow preventer

Laboratory faucet type vacuum breakers

Front 4

Define back pressure

Back 4

A reversal in flow where Water flows from a higher point in the system to a lower one,

A reversal in flow when the normal supply pressure is reduced or lost when there is high velocity flow in the main.

Front 5

Back pressure/Backflow preventers rated by 3 degrees of hazard. What are they?

Back 5

Minor, moderate, severe

Front 6

How is an ‘ Air Gap’ rated ?

Back 6

Severe in critical areas or where water is not required under pressure.

Front 7

What is an RP?

Back 7

Reduced pressure principle Backflow prevention Device

Front 8

Certified testers successfully perform tests on what 3 devices?

Back 8

Pressure Vacuum Breaker Assembly (PVB)

Double Check Valve Assembly (DCVA)

Reduced Pressure Principal Backflow prevention assembly ( RP)

Front 9

Testers must be recertified every ____years or demonstrate-testing every _____ years.

Back 9

5

2

Front 10

Who is responsible for test certification requirements?

Back 10

American Water Works Association

AWWA

Front 11

Size of an air break:

Back 11

1” or 1 pipe diameter

Front 12

Air Gap

Back 12

1” or 2 pipe diameter

Front 13

Define Anti Siphon Breaker

Back 13

Device installed on a line that is designed to prevent a Vacuum from forming in a piping system.

Installed max 1” from the top

Front 14

Define an Atmospheric Vacuum Breaker (AKA non pressure type vacuum breaker)

Back 14

A device containing a shut off valve followed by a valve body containing a disc float assembly a check seat and an air inlet port.

Front 15

Location and max pressure of an atmospheric Vacuum Breaker

Back 15

6” above flood level rim

12 hours

Front 16

Atmospheric pressure

Back 16

14.7 psia

101 KPA

29.92 inches of mercury

Front 17

Define Back pressure Backflow preventer

Back 17

Prevents Backflow due to condition in which pressure in the system become greater than the supply pressure.

Front 18

Define Backflow preventer , double check valve type (DCVA)

Back 18

Device consisting of 2 internally force loaded approved check valves installed between two shut off valves .

Front 19

Describe an RP

Back 19

Two independently acting force loaded check valves separated by an independently operating hydraulic differential pressure relief valve.

Front 20

Define barometric Loop

Back 20

A piping loop rising at least 35 feet at its uppermost point above the highest fixture it supplies. This is done to prevent Backflow and back pressure.

Front 21

What is a check valve?

Back 21

Self closing valve designed to permit flow in one direction, that closes if there is a reversal of flow.

Front 22

In regards to a back siphonage preventer, what is the Critical Level (CL)?

Back 22

Lowest level to which a back siphonage preventer can be submerged in water before Backflow begins.

Front 23

Cross connection

Back 23

Any unprotected ACTUAL or POTENTIAL piping connection or structural arrangement between public potable water system and any other source where it is possible to introduce used water, industrial fluids, gases or substances into the potable water system.

Front 24

Describe a MINOR degree of Hazard:

Back 24

Cross connection that would constitute a nuisance without any health hazards.

Front 25

Describe a MODERATE hazard:

Back 25

Cross connection that has low probability of becoming a severe hazard

Front 26

Describe a SEVERE Hazard:

Back 26

Cross connection or potential cross connection involving a substance that could be a danger to health.

Front 27

Negative pressure is pressure ________atmospheric pressure, creating a ________

Back 27

Below

Vacuum

Front 28

What is a Vacuum Breaker?

Back 28

Device designed to prevent back siphonage by providing an opening through which air may be drawn automatically to relieve negative pressure in the supply pipe

Front 29

Define potable water

Back 29

For for human consumption, free of impurities at harmful levels

Front 30

Define non potable water

Back 30

Unsafe for drinking or cooking

Front 31

Possible cross connection

Back 31

Where modifications to the piping system could result in a cross connection.

Front 32

What is Backflow ?

Back 32

Unwanted flow of non potable water into the potable system

Front 33

What is the cause of back pressure?

Back 33

Interconnection with another system operated at a higher pressure.

Front 34

Backflow prevention devices must be ________, _______, _______ and ________ by the owner.

Back 34

Inspected, tested, installed and maintained

Front 35

List the areas where Air Gap is mandatory

Back 35

- sewage handling plants

-non potable water systems

- presence of any Lethal substances

Front 36

What is contamination?

Back 36

Impairment of quality of water that creates an actual hazard to public health through poisoning or spreading of disease.

Front 37

What is pollution?

Back 37

Impairment of quality of water that does NOT create an actual Health Hazard.

Front 38

List the diseases that can be carried in water and spread through cross connection

Back 38

Amoebiasis

Cholera

Infection Hepatitis

Salmonellosis

Shigellosis

Paratyphoid

Typhoid Fever

Front 39

What is the maximum height of a permanently installed device?

Back 39

5’ or 1.5m above the floor or any platform

Front 40

What class of contamination would medical gas fall into?

Back 40

Severe

Front 41

What method offers the best protection from cross connection?

Back 41

Air Gap

Front 42

What is the minimum protection to be used on a residential lawn sprinkler that uses no chemicals?

Back 42

DCVA

Front 43

A wet standpipe system with glycol would require what protection?

Back 43

RP

Front 44

What is the height requirement for clearance above the device for testing purposes?

Back 44

1 foot

Front 45

What is the minimum spacing below the device for testing purposes?

Back 45

1 foot

Front 46

Who has the jurisdiction of overall responsibility for health?

Back 46

Health departments

Front 47

List the responsibilities of the water purveyors:

Back 47

Provide safe and potable water

Front 48

List the responsibilities of the owner :

Back 48

Prevent pollutants and contaminants from entering the public water system

Front 49

At whos expense, shall the owners have tested and maintained , as directed by the authorities with jurisdiction .

Back 49

They’re own

Front 50

Certified cross connection specialist is responsible for :

Back 50

Completely testing Backflow assemblies

Front 51

The manufacturers of cross connection control devices must_____________________

Back 51

Ensure all its devices conform to applicable standards and bear the necessary stamp of approval of an accredited agency like CSA

Front 52

An open cat or water supply including a float operated inlet shall be protected by an_____

Back 52

Air Gap back siphonage preventer

Front 53

The minimum air Gap of a water supply pipe is ______the diameter of the effective opening of the ________

Back 53

Two times

Outlet

Front 54

Minimum air Gap shall be no less than ______”

Back 54

1”

Front 55

The Backflow prevention device that is open to the atmosphere shall not be located where _____________________

Back 55

It could contaminate the water supply, and the opening cannot be submerged and spillage where it is open to the atmosphere would be undesirable

Front 56

Reduced back pressure Backflow preventers are installed in the potable water supply service pipe to what types of facilities?

Back 56

Medical treatment hospitals, fertilizer plants , meat packing plants , abattoirs, chemical plants

Front 57

An atmospheric Vacuum Breaker shall be used on supplies that are ______and ____

Back 57

Non Toxic

Non Lethal

Front 58

An atmospheric Vacuum Breaker shall never be installed lower than _____” above the flood level rim

Back 58

12”

Front 59

The pressure vacuum shall never be used where it is subject to _______, and the device has a valve _______ of it.

Back 59

Back pressure

Downstream

Front 60

An atmospheric Vacuum Breaker must be installed so it’s critical level is not less than _____” when it is installed in other that a water closet tank and __” when it is used in a water closet tank.

Back 60

6”

1”

Front 61

The required distance for a pressure vacuum breaker above the flood level rim is ______”

Back 61

12”

Front 62

What hazard is the double check valve assembly used for?

Back 62

Moderate

Front 63

What hazard is an RP used for?

Back 63

Severe

Front 64

How many check valves does an RP device have?

Back 64

2

Front 65

How many check valves does a pressure vacuum breaker have?

Back 65

1

Front 66

Does

Back 66

Lawn service

Front 67

Define effective opening

Back 67

Diameter of supply opening

Front 68

Does an air Gap have mechanical parts?

Back 68

No

Front 69

What is the distance required above a double check valve assembly when using sight tubes for testing?

Back 69

900mm/3’

Front 70

The reduced pressure principal Backflow preventer is used for what type of protection only?

Back 70

Back Siphonage and back pressure

Front 71

The atmospheric Vacuum Breaker is used for protection from contamination by _______

Back 71

Back siphonage

Front 72

At atmospheric Vacuum Breaker must be installed ______ above the highest outlet of the flood level rim of all fixtures

Back 72

6”

Front 73

The atmospheric Vacuum Breaker shall not be installed where it is under continuous flow for more than ______hours

Back 73

12