Potable Water Distribution System

Front 1

Velocity

Back 1

Rate at which water flows

Front 2

Pressure

Back 2

Force exerted to walls of pipe

Front 3

What effect does unreamed pipe have on the flow of water in a pipe?

Back 3

Turbulence

Front 4

When does water hammer occur

Back 4

When water is forced to change direction or suddenly stop

Front 5

3 way to prevent water hammer?

Back 5

1)shock absorber

2) air chambers

3) open valves slowly

Front 6

4 causes of water hammer?

Back 6

1)Opening/closing valves too quick

2) temperature change

3) change in direction of pipe

4) water stopping too quickly

Front 7

How do you recharge an air chamber?

Back 7

Drain system and refill

Front 8

5 things must be known in order to size water supply?

Back 8

1) pressure at water supply

2) min. Static pressure at property line

3) maximum pressure at highest point

4) total developed length of water supply

5) length of distribution pipe (building supply-furthest fixture

Front 9

Min. Working pressure at a fixture?

Back 9

Manufacturer spec.s

Front 10

Max working pressure at a fixture?

Back 10

550 kPa

Front 11

When sizing multiple wc with direct flush valves. Where is the largest value?

Back 11

Furthest fixture

Front 12

Min air gap on a lav?

Back 12

1"

Front 13

How must water supply to a lab sink be protected from backflow?

Back 13

Air gap

Front 14

Term used to describe the water piping inside a building?

Back 14

Distribution piping

Front 15

What is the min size of water metre?

Back 15

5/8"

Front 16

What does water meter do?

Back 16

Monitor and record water consumption

Front 17

What meter is most commonly used?

Back 17

Positive displacement

Front 18

What is the primary use of a turbine meter?

Back 18

Industrial use and large flow volume

Front 19

Do water meters have to be electronically grounded?

Back 19

Yes to prevent injury on person working on it.

Front 20

How far must a meter be from any entrance, wall, or grade wall?

Back 20

12"

Front 21

For a 5/8" water meter how much space is needed between adapters?

Back 21

12"

Front 22

How many valves needed build bypass?

Back 22

3

Front 23

What type of valves on bypass?

Back 23

Full port valves - gate and ball

Front 24

How do you prevent water condensation on water lines?

Back 24

Insulation

Front 25

What causes condinsation on water lines

Back 25

Humidity condensing on the surface of cold pipe (water continues to move)

Front 26

Can public water system be connected to private system?

Back 26

No

Front 27

Provisions shall be made to protect water distribution from adverse effects of?

Back 27

Water hammer

Front 28

A newly installed part of potable water distribution system shall be ________before the system is used?

Back 28

Flushed

Front 29

A newly installed part of potable water distribution system shall be ________before the system is used?

Back 29

1) recirc pump

2) heat tracing

Front 30

Name 2 types of methods of water distribution?

Back 30

1) gravity fed

2) pressure and forced

Front 31

.433psi

Back 31

1 ft high of water

Front 32

1 psi is equal to how many ft of water?

Back 32

2.31'

Front 33

How long should water supply hold under pressure testing?

Back 33

0 minutes at max working pressure

Front 34

Air min pressure test?

Back 34

700 kPa for 120 minutes

Front 35

Chart for sizing urinals?

Back 35

2.6.3.2.B

Front 36

Chart used for wc flush valves?

Back 36

2.6.3.2.C

Front 37

Name 4 things you need to size booster pump?

Back 37

1) needs of building

2) number of FU

3)height of building

4) flow rate needed

Front 38

For every metre there is____ lost?

Back 38

10 kPa

Front 39

2 reasons for installing control valves on cold supply to HWT

Back 39

1)Isolation

2)service

Front 40

What is the purpose of the sacrificial anode

Back 40

Reduce corosion due electrolysis

Front 41

Why are gas and electrical tanks heavily insulated?

Back 41

Min heat loss

Front 42

Coating applied to steel HWT to prevent corosion

Back 42

Galvanized, glass or stone lining

Front 43

Why is PRV valve required on HWT?

Back 43

Prevent tank from exploding when water gets too hot and flashes to steam

Front 44

4 Advantage of electric HWT?

Back 44

1)quiet

2)no venting

3)more choice in location

4)no energy lost in transfer of heat

Front 45

2 types of gas HWT?

Back 45

1)direct fire

2) instantaneous

Front 46

How is the cold water directed in a HWT to the bottom?

Back 46

Dip tube

Front 47

What is inserted into the flue for better heat transfer from flue gases in a gas HWT?

Back 47

Helix type baffle

Front 48

Advantage of instantaneous HWT?1

Back 48

No storage and no heat loss

Front 49

Advantage of gas fired HWT?

Back 49

Better recovery

Front 50

4 areas domestic HWT needs to meet code?

Back 50

1)shut off

2)T&P within 6" top of tank

3)T&P needs to be certified

4) has to have gas valve (device shutoff the electricity of gas when reaches desired temp)

Front 51

What size does discharge pipe from T&P valve be?

Back 51

Same as inlet

Front 52

Where should outlet terminate?

Back 52

12" above floor

Front 53

Can you alter T&P valve?

Back 53

No

Front 54

Device that prevents HWT from exploding?

Back 54

T&P valve

Front 55

Define thermal lag on water supply line?

Back 55

Slow timing for HW to reach fixtures

Front 56

What can be done to prevent T&P valve from liming up?

Back 56

Install in vertical position and use plastic coated sensing element

Front 57

What Temperature do fusible plugs melt?

Back 57

210°F

Front 58

How should T&P valve be sized?

Back 58

By input burner rating

Hint 58

BTU

Front 59

In commercial HWT installed on horizontal it must be on metal masonry stand ____-_____ from the floor to bottom of tank.

Back 59

4'-6'

Front 60

What is the 4 factors when deciding method of install for HWT?

Back 60

1)volume

2)space required

3)existing structures (power and chimney)

4) delivery of HW to furthest fixture

Front 61

What does the dip tube have if cold supply is on top of tank?

Back 61

Small hole called anti-siphon

Front 62

Temperature rises to 210°F what happens?

Back 62

The sensing element activates relief valve

Front 63

Warm setting on HWT?

Back 63

120°F

Front 64

Normal temperature setting on HWT?

Back 64

140°F

Front 65

Hot temperature setting on HWT?

Back 65

160°F

Front 66

How valves on bypass?

Back 66

1

Front 67

T and p relief valve temp storage water tank cant exceed?

Back 67

99°C / 210°F

Front 68

Water supply size to a flush tank urinal?

Back 68

3/8"

Front 69

_____water piping shall be identified by markings that are permanent distinct and recognized?

Back 69

Non potable

Front 70

In an apartment building with private use is the laundry room public or private?

Back 70

Private