Plumbing Theory Flashcards
(111 cards)
1
Q
Minimum size cleanout for 8” pipe
A
4”
2
Q
Min size clean out for a 8” building sewer
A
Manwhole
3
Q
Min size building drain
A
3”
4
Q
How many wcs till bd is 4”
A
3
5
Q
How far must a vent terminal be from a fresh air inlet?
A
1m above 3.5m away
6
Q
What does a backwater valve protect?
A
Fixtures below grade
7
Q
Do slab on grade buildings need a backwater valve.
A
No
8
Q
Min size bs sewer connected to a public sewer?
A
4”
9
Q
A soil or waste stack is sized acording to?
A
The number of fu and the number of fu from any one story
10
Q
Min size building drain?
A
3”
11
Q
A continues vent is?
A
A vent pipe that is an extension of a vertical section of branch or fixture drain
12
Q
Backwater valve needs to be?
A
Redilly accsesible
13
Q
A branch vent is best defined
A
A junction of two or more vent pipes
14
Q
Min size cleanout serving 4
A
3inch
15
Q
Max cumilitive change of direction on kitchen sink for cleanout food receptical
A
90degrees
16
Q
Where do you have 135 degrees of comulitave change
A
Trap weir to vent fitting
17
Q
Max distance between 4” barret clean outs on bd is?
A
100’ 30m
18
Q
Min size roof terminal where subject to frost closure?
A
3”
19
Q
Horzontal dwv plastic support?
A
1.2 meters (4feet)
20
Q
Why are vents upsized before leavint building
A
Frost
21
Q
Min size vent for 4” trap
A
1 1/2
22
Q
Max change on wc
A
225 degrees
23
Q
Trap arm is from
A
Trap weir to vent fitting
24
Q
Min wize wet vent
A
1 1/2
25
Vents are installed to
Prevent back pressure
26
Min size wet vent serving a wc and a basin is?
2 "
27
A soil or waste may serve a wet vent provided there is not more than one nomally horizontal offset (less then 45degrees) in the wet vent , and the offset does not exceed ______ for pipes 2 inches or less
1. 2 m
| 2. 5 m for larger than 2"
28
The largest size trap arm or fixture drain that can drain into a wet vent?
2" normally unless 3" emergency floor drain
29
Maximum amount of tank type wc that drain into 3" wet vent?
None. They can be vented but not wet vent
30
A trap is reauired on subsoil drainage if
It drains into combined sewer
31
What is the proper order of fittings on a sump discharge (with direction of flow)
Union, check valve, fullport valve (ball valve, gate valve)
32
A subsoil drainage system that is connected to a storm sewer must have
A backwater valve
33
Thermostat in domestic water heater normally set at what tempature?
140F 60C
34
Dip tube has small hole on hw t
To prevent siphoning on the hot water tank
35
The discharge tube from a hw heater should be
End within 12" 300mm
36
Tmp relief valve on hwt is openned at
210f 150 psi 99c
37
Main purpose of dip tube on hwy
Prevent cold water from mixing with hot water
38
Testing water system with air?
700kpa 100psi for 2 hours
39
What needs a shut off valve fixture
Wc
40
Pres reg valve should provide downstream pressure of no mor than
80 psi
41
Min size water sevice allowed?
3/4"
42
Min water supply tubing for bathtub or shower
1/2"
43
Water line fu rating for a domestic clothes washer?
1.4 fu
44
What is the maximum tempature settinf for bathrub or shower
120f 49c
45
A cast iron service sink is installed with preferable
3" p trap standard. Minimum is 2" p trap
| Made of cast then sprayed with enamel porcelain paint
46
What type trap is perfered for mop sink
3" p trap min is 2"
Made out of terrazzo, fibre glass, or built in concrete.
Terrazzo is mixture of rock and concrete then it is smothed out
47
Why does a clothes washer have a loop
To stop from self draining
48
Min hight and diameter of lsp is?
24" min 600mm 36" max and terminates above flood level rim. Measured from trap weir.
2" diameter
49
Two types of garborstors
Continues feed and batch feed. Stopper off on batch wont work
50
Garbage grinder must be drained into?
A trap.
51
Can A vent pipe be erected outside a building as apposed to through the roof
Yes. True
52
A service sink faucet generally include
Integeral stops, hose thread on spout, vacuum breaker, wall bracket.
53
What is a branch?
Soil or waste pipe connected upstream end to the junction of 2 or more soil or waste pipes or soil or waste stacks, and connected at its downstream end to another branch,
54
What is a branch vent?
Two or more dry vents connecting together but if on top of stack, stack takes presidence so its called a stack
55
What makes a vent header?
Two stack vents
56
Hot water velocity in distrinution piping in a residence?
1.5 fu velocity
57
What fixture has a 2.2 fu velocity?
Wc
58
What fixture has a fu velocity of 2.5?
Hosebib
59
Min size cleanout for bs ?
4"
60
Min size bs cleanout for 4"bs
4" cleanout
61
Max length on 3" fld
Shorter than 12 feet to vent through the building drain
62
Tests for dwv include?
Water test for 15min, ball test, air test. Test plug needed and no more then 1" water collum of pressure on final test because smoke will go through trap seals
63
Whats a top snake?
Hand opperated drain cleaner
64
After use on drain cleaner what should be done to the cable?
Sprayed with corrosion protection
65
For operator saftey, Larger electric drain cleaning machines are controlled on/off by a ?
Captive air bulb saftey switch
66
First tool into a drainage line containing an unknown blockage should be.
Sampling or inspecting tool
67
How is the distance (fall) from the vent and the trap sized?
Drop cant be more then one pipe diameter.
| 11/4"-3" is 1/4 "/ft 1/50 or 2% 4" and higher is 1/8th"per foot 1/100 1%
68
Minimum distance between a vent and a trap?
Twice the the size of fixture drain
69
What is a storey?
Two floors
70
What is a soil or waste stack?
A soil or waste pipe that goes through atleast 1 storey
71
What can cause a fixture to self siphon?
Trap is too far below fixture. Canadian Max is 1200mm in alberta only 900m (36")
72
Min trap seal depth?
1 1/2 or 38mm
| Or 2" for acid waste 50mm
73
When is the artiel loop distribution system used by municipalities
When there is heavy demand on the system
74
How do you protect changes in elavation or direction on a water distribution line?
Thrust blocks and anchors
75
If a check valve or backflow preventer is installed to protect a water service pipe that is for cold water only, what does the system become?
Closed system, a diaphram/expansion tank is now needed.
76
What is the minimum size of water service distribution piping to a water heater serving more than two fixtures ?
3/4"
77
When do you need a reserculation line?
4 storeys, or 30m developed length
78
A stack vent is measured by?
| Min size?
The developed length from its lower end to outside air
| Half the size of soil or waste stack at its base.
79
Max pressure for a fixture in water distribution system is?
550kpag and pressure reducing valve maintains that if it has excess pressure.
80
When will a meter bypass be installed?
When the meter is larger then 1 1/4
81
Smallest service pipe allowed in water distribution?
3/4"
82
Hot water tanks ussually have a maximum working pressure of?
150 psi
83
The information needed for sizing water distribution system is?
Pressure at building isolation(min 200kpa)
| Distance from main to furthest fixture
84
How are hwt sized?
Number of building occupants
85
A vacuum breaker on a hwt does what?
Replace small whole drilled in dip tube
86
After installation of water lines you should?
Flush all lines, including clothes washer and dishwasher lines
87
Minimum size continues vent?
1 1/4
88
What tables are continnues vents under?
2.5.8.3 and then cross referanced 2.5.7.1
89
What tables are wet vents sized from?
2.5.8.1
90
2.5.7.1 is what table? What vents are sized by 2.5.7.1?
vents size based on trap served.
| All vents
91
The minimum size building cleanout is?
4"
92
Minimum slop a trap arm can be installed at?
2%
1/50
1/4"/ft
93
How are trap arms sized?
The size of the fixture outlet pipe
94
A water closet must be in a room with what?
Lighting and ventilation.
| A dwelling needs a lav
95
Min size wet vent serving a wc?
2"
| 50mm
96
How far generally is the toilet mounted off finish wall?
12" 300mm
97
Why is a tank on wc insulated?
Stop condensation from forming on the outside of the tank.
98
Where do you find specs on space requirement on wc?
Manufactures rough in book
99
What is the maximum size trap arm of a minimum size floor drain?
2.4 m or 8ft for 2"
3 m or 12ft for 3"
10m 32 ft
100
When can you have floor drain trap arm that is 2 pipe diameters to 18"
When it has its own vent.
| Otherwise connected through bd and must be 18"
101
Max amount of fixture units drained from any 1 storey
4 f.u
102
A wet vent will be sized according to what table?
2.5.8.1
103
What must be known to size a building drain?
Total fixture units and grade
104
How do you size a continues vent?
Developed length and amount of f.u its venting, then sized according to largest trap served
105
What is the minimum supply pressure to a fixture?
50kpa 7psi
| Maximum is 550 kpa
106
Max amount of f.u drained into a 3" building drain
| Horizontal
27 f.u
| 102
107
Minimum size wet vent venting a wc.
2"
108
Max fixture unit load from any one fixture drained into a wet vent?
2 f.u
| A 2 f.u urinal may be drained into a wet vent as long as its within the 8 ft.
109
Minimum size garbage grinder?
1 1/2" resi
| 2" comercial
110
What additional fixture should be supplied with a clothes washer?
Floordrain
111
Min Size trap on 3 compartment sink?
2"
Common trap arm to all three sinks must be one size larger than the largest fixture outlet pipe being served.
