Learning Task questions Flashcards
(106 cards)
1
Q
Describe what Potable water is
A
Water that is safe for human consumption
2
Q
By code every dwelling should be supplied with what?
A
potable water
3
Q
True or False: Water supplies can be private or public
A
True
4
Q
What are some above ground sources of water?
A
Lakes and rivers
5
Q
What is an example of an underground water source?
A
Aquifers
6
Q
Are “water services” upstream or downstream of the of the curb stop?
A
Upstream
7
Q
Describes “Water Distribution System”
A
From: water service pipe / private water supply system
To: water supply outlets, fixtures, appliances / devices
8
Q
What water distribution system is for inside buildings?
A
Building water distribution system
9
Q
What type of water is contaminated water?
A
Water that contains matter
Is capable of seriously affecting health of people drinking the water
10
Q
What type of hazard would Contaminated water fall under?
A
Severe Hazard
11
Q
What kind of contaminates are in contaminated water?
A
organic or inorganic
12
Q
True or False: Corporation stops are considered sacrificial (or Sacrificed)
A
True - they get buried underground
13
Q
What is a Corporation Stop?
A
a valve installed on a municipal water main to permit joining of the water service pipe.
14
Q
What is the definition of Cross Connection?
A
Any source of pollution, contamination or other material/ substance that could change water quality in drinking water supply
15
Q
What term means: the use of water for human consumption, food preparation or sanitation?
A
Domestic Purposes
16
Q
Are plumbers involved in the design of Municipal Water Distribution Systems?
A
As a whole, No.
17
Q
Can plumbers install / maintain piping/ components of a Municipal Water Distribution System
A
Yes
18
Q
What type of Hazard is Polluted water?
A
moderate hazard
19
Q
Will polluted water cause serious injury to health?
A
No,
20
Q
What kind of pollutants are in Polluted water?
A
Organic and Inorganic
21
Q
Is polluted water treatable?
A
yes
22
Q
What is a pressure system?
A
Is a water supply design that uses equipment / components that include pumps, pressure tanks / controls.
23
Q
True or False: Pressure systems are private water supplies (ex: well water)
A
True
24
Q
What is Raw water?
A
is Water in its natural state
Untreated water
25
What are examples of raw water?
rainwater, groundwater / water from bodies (lakes / rivers)
26
What is Used water?
Water from purveyor and has passed through property line or water meter / is no longer under control of water purveyor
27
Who / what is a water purveyor?
Is the owner or operator of a potable waterworks system
28
What are other names for a water purveyor?
Water provider or water supplier
29
Where does most of the raw water come from?
surface water sources (rivers / lakes)
30
What is another name for the Hydrologic cycle?
The water cycle
31
What is the Hydrologic / water cycle?
It's the path water takes as it moves through the environment
32
What is Flocculation?
The thickening or coagulation of water (used in water treatment)
Alum - thickening agent?
33
What % is in chlorine solution?
1%
34
What are Head pressures?
aka Original sources
Surface water
Ground water (well)
Alternative supply
35
What does water stored in clouds store?
Carbon dioxide from the atmosphere
36
What is the level of natural precipitation?
close to 5.6
37
What is considered a universal solvent?
Water - it can dissolve more than any other liquid
38
What does Cross Connection Controls help with?
Helps prevent used water from backflowing into potable water supply systems
39
What is the best type of filtration?
Sand
40
What does filtration include?
removal of suspended particles, debris / algae
41
What does disinfection include?
removal of bacteria and viruses
42
When can water be considered Potable? (Mcb)
When water has been properly tested for its mineral, chemical / biological characteristics
43
True or False: Biological characteristics have to be tested by government agencies
True
44
What types of system are Booster pumps used on?
Building water distribution systems
45
What are the 2 different pumps based on operating principal?
Positive displacement
Centrifugal
46
What type of pump (bn positive displacement and centrifugal) have a spinning action?
centrifugal
47
What does the centrifugal spinning action create? (Vd)
Variable displacement
48
How does a centrifugal pump move liquids?
Through rotational energy from one or more driven rotors aka impellers
49
What does the action of an impeller do?
Increases fluid's velocity / pressure and directs liquid through outlet
50
What is the key component of a Centrifugal pump?
the impeller
51
What does the impeller consist of?
curved vanes - responsible for movement / speed of water
52
What are the entry and exit points of the fluid from a centrifugal pump?
entry = the impeller at the axis (eye)
Exists = along the circumference between the vanes
53
What is a Volute?
the pump casing on a centrifugal pump
54
How does a positive displacement pump move fluid?
by repeatedly enclosing a fixed volume / moving it mechanically through the system.
(like a piston)
55
How does a reciprocating positive displacement pump work?
By the repeated back / forth movement (strokes) of either a piston, plunger or diaphragm
56
What type of pump is electrically driven and multi-staged? (and a type of centrifugal pump)
Booster pump
57
When are booster pumps used?
they are used to boost the water main pressure at different intervals based on pressure loss or elevation loss
58
True or False: it is common to use a PRV (pressure reducing valve) on the downstream of a booster pumped system
True
59
What is a hot water recirculating pump used for?
used to circulate domestic hot water to have hot water usable w/in seconds
60
What is the difference bn a hot water recirc pump and hydronic circulator?
Hot water recirc has wetted - components that will not contaminate potable water supply
61
What type of materials make of a hot water recirc pump to make it safe for potable water?
Bronze and stainless steel materials and plastics
62
What are Jet pumps commonly used for?
To lift water from wells
63
What are the 2 different designs of a Jet pump?
Shallow well - contains suction line
Deep well - contains suction and dry lines
64
True or False: a Jet pump is 2 pumps in one: a centrifugal pump and an ejector
True
65
What is another name for ejector?
Jet assembly
66
What does the Ejector determine?
Pumping depth of the Jet pump
67
What depth can a shallow well do to?
25'
68
what depth can a deep well go to?
greater than 25'
69
What is the main advantage of a Submersible pump?
Is that is does not require priming as the suction is submerged in the fluid.
70
What types of submersible pumps do plumbers use?
sump pumps, sewage pumps, storm water pumps, deep well pumps.
71
At what depth would you use a Deep well jet pump?
25' - 110'
72
At what depth would you chose a shallow well jet pump?
less than 25'
73
When would you use a 4" submersible pump?
for lengths of 25' - 400'
74
What is the min coverage for freeze protection?
4' - 5'
75
What can the pressure in water supply mains exceed?
1380 kPa (200 psi)
76
Why do water supply utilities use pumps?
to increase pressure in water mains to sufficient levels to supply water for firefighting
Overcome pressure loss in high rise buildings
supply water towers / tanks
77
What must be installed if the pressure at any fixture exceeds 550kPa?
PRV (pressure reducing valve)
to limit the static pressure
78
What are the 2 types of pressure reducing valves used on water supply systems?
Direct acting
pilot - operated
79
Which of the 2 types of PRV are the most common?
Direct acting
80
What type of valve is used for low flow rates and has a spring that is always loaded to the open?
Direct acting, spring loaded PRVs
81
Why is a strainer always installed on the high-pressure side?
To prevent dirt / debris from becoming lodged bn the valve seat and disc, preventing it from shutting off.
82
What is it called when a second PRV is installed immediately downstream of the first PRV?
a Series
83
When 2 or more small PRVs are used to replace a large valve, Why would one have a slightly higher opening pressure?
To prevent both valves from operating during low-demand periods.
84
What does having a higher set PRV (when there are 2 PRVs) prevent?
Valve seat etching dt passage of water bn the valve seat / disc
Reduces maintenance costs by causing only one valve to be in constant operation
85
True or False: In Parallel PRVs, the smaller valve can handle very low demand periods
True
The larger PRV handles the peak demand flows
86
When is a Vacuum relief valve used?
to prevent a vacuum condition from occurring in the piping
87
What are the different options for air and vacuum relief valves? (there are 5, good luck)
-manually operated valves
-air released valve only
-vacuum relief valve only
-Separate air release / vacuum relief valves
-Combination air release / vacuum relief valves
88
Why is air permitted to enter the combination air release / vacuum relief valve / replace water while line is being drained?
To prevent system collapse
89
What degrees are corporation stop installed at?
30 - 40 degrees
90
What is the purpose of a gooseneck on a residential water supply system?
for settlement and protects against frost heave
91
Is the water service located on the inside or outside of the building?
Outside
92
Is the water distribution pipe located on the inside or outside of a building?
Inside
93
What is a Mueller thread?
Are fine threads and made of brass
94
what length of time is Peak - demand flow considered for?
2 hours
95
What is municipal water pipe's max velocity?
5' per second
96
What does Hazen - Williams formula figure out?
pipe friction loss
97
How is ductile - iron made?
centrifugal casting
98
How is ductile - iron joined together?
push on or mechanical joints
99
What are the different colours of PVC pipe?
Blue - potable water
Green - sewer
Purple - non - potable water
White - general use - radon
Gray - general use - electrical
100
What is manufactures max limit joint deflection
5 degrees
101
True or false: Stainless steel service saddles w/ a direct tapped tee is sacrificed.
True
102
What causes Thrust?
water pressure and sudden changes in water velocity
103
True or False: Thrust blocks provide restraint in vertically and horizontally
True
104
Why do we use polyethylene film to cover fittings?
It helps with future disassembly or revision
105
Where is hot tapping used most?
In hydraulics or sprinklers
106
Polluted water is what?
Water that contains objectionable matter
