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Cross Connections > Chapter 1 > Flashcards

Chapter 1 Flashcards

1
Q

What is the Definition of a Cross Connection?

A

Any actual or potential connection bn a potable water supply / pipe, vessel, fixture, equipment - where it’s possibly for used, polluted, contaminated water chemicals to enter potable water system

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2
Q

What are 5 examples of Cross Connections? (DBJRS)

A

Direct connections
Bypass connections
Jumper connection
Removable connection
Swivel or change - over device

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3
Q

What is the definition of backflow?

A

Is the undesirable reversal of a flow in a potable water connection

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4
Q

What are the 2 principle causes of backflow?

A

1) Back-siphonage
2) Back pressure

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5
Q

What is the definition of Back siphonage?

A

Backflow caused by pressure below atmospheric in the supply system

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6
Q

What are 2 principle causes of back siphonage?

A

1) broken water main
2) Open fire hydrant

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7
Q

What is the definition for back pressure?

A

A pressure higher than the supply pressure

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8
Q

What are 3 common causes of back pressure?

A

1) Booster pumps
2) Boilers –> thermal expansion
3) Interconnections w/ other systems at high pressure
4) Elevated piping

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9
Q

What is atmospheric pressure?

A

Is pressure created by the weight of the atmosphere on a surface

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10
Q

What is the number of atmospheric pressure?

A

14.7 psia (101 kPaA)

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11
Q

What is 1’ water column height?

A

.433psi / ft WC

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12
Q

What is 1” water column height?

A

0.0361 psi / in WC

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13
Q

What is Gauge pressure?

A

Is the pressure read on a gauge

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14
Q

How do you get absolute pressure?

A

gauge pressure + atm pressure

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15
Q

What is a vacuum?

A

When the absolute pressure is less than the atm pressure
Gauge pressure is negative

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16
Q

What is Differential pressure?

A

the difference in pressure bn 2 points

17
Q

1 imperial gallon = how many pounds?

A

10lbs

18
Q

what is the Density of water?

A

62.4 lbs / cubic foot

19
Q

What 3 things affect pressure?

A

1) height
2) density of fluids
3) temperature

20
Q

What does not affect pressure?

A
  • width / diameter / shape of the container
21
Q

A building of — height should consider backflow protection

A

10m (30’)

22
Q

A broken water main will cause what to happen?

A

Back siphonage

23
Q

What are 4 things that cause thermal expansion?

A

1) boilers w/ potable water make - up lines
2) domestic water hot
3) Glycol loops
4) Solar heating systems

24
Q

What is the best form of backflow protection?

A

Air Gap

25
Q

Something that is written with “mandatory - type” language means what?

A

It’s not mandatory
ex: CCC = not mandatory

26
Q
A

Cross Connections (10 decks)

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