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Plumbing Level 2 > DWV take 2 > Flashcards

DWV take 2 Flashcards

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1
Q

The maximum horizontal length of a w.c fixture drain is?

A

10 ft (3m)

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2
Q

A vent stack shall be installed to protect the base of every soil or waste stack that passes through more than:

A

4 storeys

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3
Q

What is the hydraulic load of a 3” floor drain in a public washroom?

A

no load

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4
Q

The size of the portion of vent pipe that terminates through the roof shall not be less than:

A

3”

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5
Q

Any roof vent terminating into the open air shall be located at a distance of not less than:

A

3.5m away from any window, door or other opening

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6
Q

The min developed length of a trap arm shall not exceed:

A

2 x the pipe diameter

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7
Q

Strap hangers shall not be used to support horizontal pipe greater than:

A

4”

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8
Q

Fixtures that drain into a vertical section of a relief or circuit vent shall not have a hydraulic load of?

A

1 1/2 FU

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9
Q

All fixtures shall have a trap w/ a water seal of?

A

not less than 1 1/2 “ (38mm)

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10
Q

A trap used to carry acid waste shall have a water seal of:

A

not less than 2” (50mm)

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11
Q

How many fixture units are permitted to drain into a soil or waste stack if the stack was to act as a relief vent?

A

6 FU each

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12
Q

The max number of a water closets allowed on a 3” soil stack is?

A

6 water closets

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13
Q

The rate of discharge through an 1 1/4” fixture outlet pipe is called a/an

A

fixture unit

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14
Q

Where a building trap is installed, a fresh air inlet shall be installed on the building drain upstream of the trap:
2.5.5.4

A

as close as possible to the trap and w/in 1.2m of the trap

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15
Q

The trap weir is?

A

The highest part of the lower interior surface

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16
Q

A vertical pipe means:

A

45 degree from the vertical

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17
Q

The max distance bn hangers on a horizontal run of ABS plastic pipe shall be:

A

1.2m (4’)

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18
Q

A building sewer begins outside a building at a point?

A

1m from the building wall

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19
Q

The total fall of a fixture drain from the trap weir to the vent fitting shall not exceed:

A

two times the diameter of the pipe

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20
Q

Any vent pipe shall extend vertically above the flood level rim of a fixture:

A

to adjust above the flood level rim before connecting to another vent

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21
Q

The min size of a fresh air inlet for a 7 storey building is:

A

4”

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22
Q

A shower receptor for 2 or 3 heads is equal to a hydraulic load of:

A

3 fixture units

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23
Q

A kitchen sink with a domestic type garbage disposal unit installed on it has a hydraulic load of?

A

1 1/2 FU

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24
Q

A 2” trap not listed in table 2.4.9.3 has a hydraulic load of?

A

3 FU

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25
Q

The max number of FU that may be connected to a horizontal branch off a 2” stack that passes through 5 storeys is?

A

6 FU

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26
Q

The max number of FU that may be connected to a 3” stack of 60 meters in developed length is:

A

102 FU

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27
Q

The max number of FU that may be connected to a 4” building drain at uniform grade of 1 in 50 is?

A

240 FU

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28
Q

The size of a trap / waste opening for a potato peeler is?

A

2”

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29
Q

The size of a trap / waste opening for a beauty parlor basin is?

A

1 1/2”

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30
Q

The min size vent for a 2” trap is?

A

1 1/2”

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31
Q

The max cumulative change in direction of a trap arm serving a lavatory is?

A

135 degrees

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32
Q

A branch cannot be connected w/in 1.5m of the base of the stack:

A
  • receives a discharge of 30 of more FUs
  • receives a discharge from fixtures located on 2 or more storeys
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33
Q

A common cause of trap seal loss in a properly vented system is?

A

evaporation

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34
Q

An ABS stack 15m in length, when subjected to a temp change of 50 C, would have a linear expansion of about?

A

70 mm
A-2.3.3.9

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35
Q

The trap seal refers to the vertical distance measured from?

A

the trap weir to the trap dip

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36
Q

In testing a 5 storey (15m) stack with water, the pressure at the base of the stack on the gauge would read?

A

147 kPa

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37
Q

If 8 water closets are required in a washroom, how many urinals could be substituted for w.c’s?

A

5
(2/3)

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38
Q

The max length of an offset on a 4” soil / waste stack serving as a wet vent is?

A

max 2.5 m

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39
Q

You must connect a sanitary building drain w/ a combined building sewer. If an open air restaurant is located on the roof of the building, and the roof drain has to be located w/in 1 m of the patio, what must you do to ensure that your rough-in passes inspection?

A

Place a running trap / clean-out on the storm building drain prior to its connection w/ the building sewer

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40
Q

What is the min length of a trap arm serving a lavatory?

A

2 1/2”

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41
Q

Which arrangement may allow a fixture to self-siphon?

A

Trap too far below fixture

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42
Q

If you have a 4” building drain connected to a 3” soil stack, what would the size of the c/o at the base of the stack be?

A

4”
2.4.7.2

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43
Q

What is the min grade on a building drain?

A

1%
1/8

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44
Q

What is the primary function of a p-trap?

A

Keep sewer gases from entering the building

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45
Q

Trap arm size are based on?

A

The size of the fixture outlet pipe

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46
Q

What would be the size of a trap that serves two lavatories that are in the same room?

A

1 1/2”

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47
Q

What size of vent terminal would be required for a 1 1/2” vent?

A

1 1/2” x 3”
2.5.6.5

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48
Q

What is the max size of a trap arm that may drain into a wet vent?

A

2 w/ the exception of an emergency floor drain

49
Q

What is the min size of c/o for a 4” pipe?

A

4”

50
Q

Flat vent is a trade name for a vent that?

A

requires a c/o fitting to be placed

51
Q

The main stack / vent located in a single - family dwelling:

A

Should be chosen to allow as many fixture as possible to connect to the main stack.

52
Q

The min drainage pipe size for a lavatory is?

A

1 1/4”

53
Q

What is the max degree change of direction on a water closet trap arm?

A

225 degrees

54
Q

On a ferrous c/o fitting, all nuts, bolts, caps and plugs shall be?

A

non-ferrous

55
Q

Which of the following traps is prohibited from use in a plumbing system?

A

bell-trap

56
Q

______ is a vent pipe that serves one fixture?

A

individual vent

57
Q

A branch vent:

A

is two or more dry vents connecting together

58
Q

the positive or negative pressure in a drainage will never exceed ____ of water column at the trap seal serving the fixture:

A

1”

59
Q

What is the max length of a continuous waste serving a kitchen sink?

A

1200mm

60
Q

On a fixture drain serving a kitchen you cannot exceed ____ degrees bn c/o:

A

90 degrees

61
Q

A 3” (80mm) stack vent is required in a residence because of:

A

the national plumbing code of Canada

62
Q

What kind of trap is allowed to be used on an interceptor?

A

drum trap

63
Q

The min pipe size for a building sewer that is to be connected to public sewer is:

A

4 “

64
Q

A pipe positioned at a 45 degree from the horizontal, is considered to be?

A

vertical

65
Q

The continuous waste / vent principle connection is considered as the best arrangement for venting because:

A

waste water does not enter the vent pipe

66
Q

A vent connection fitting placed on a trap arm:

A

must have the vent opening arranged above horizontal centreline of the trap

67
Q

The min slope to which a trap arm must be installed is?

A

2% grade

68
Q

What is the min distance that a vent can terminate above a door?

A

1m

69
Q

The waste pipe of dual-vented fixtures must connect at?

A

same level

70
Q

What is the min trap seal depth for all traps except those that drain acid wastes?

A

1 1/2” –> 38mm

71
Q

When applying a water test to a part of the drainage system:

A

a 10 ft head must be created

72
Q

Where does a fixture drain start?

A

at the trap weir

73
Q

A building sewer which conducts both sewage / storm water is called a?

A

combined building sewer

74
Q

A wet vent pipe acts as a/an ___ pipe and also a/an ____ pipe:

A

waste / vent

75
Q

What is the largest size pipe that can be hung w/ perforate steel strap?

A

4”

76
Q

What is the min size of a wet vent that serves a water closet?

A

2” (50mm)

77
Q

An individual vent becomes a stack vent when:

A

a fixture drain extends through at least one complete storey

78
Q

What would happen is the fall on a trap arm was more than one pipe diameter?

A

the trap may self-siphon

79
Q

What is the min distance that a vent can terminate above a balcony?

A

2m
6 ft

80
Q

What is the portion of the fixture drain bn the trap weir and the vent pipe fitting?

A

Trap arm

81
Q

A properly piped wet vented group of fixtures that includes a water closet:

A

Must have the water closet piped as the lowest vented fixture

82
Q

What is the max allowable change of direction bn a c/o and the pipe that it serves?

A

135 degrees

83
Q

On a building drain you cannot exceed ____ degrees bn c/o?

A

45 degrees

84
Q

When sizing the vertical portion of the wet vent, do not include the fixture unit load of the connected fixture?

A

Lowest (most downstream)

85
Q

What connects the waste opening of a fixture to the trap serving the fixture?

A

fixture outlet pipe

86
Q

Which vent pipe that is an extension of the soil or waste stack above the highest horizontal drain connected to the stack?

A

stack vent

87
Q

The combined wastes from a lavatory / a single compartment sink are used to wet vent a 3” water closet. The wet vent size should be?

A

2”

88
Q

A fixture drain piped to a drain through one complete storey min is called a:

A

soil or waste stack

89
Q

Rain water leader sizing is based on rainfall volume in ____ over a period of 15 min:

A

mm

90
Q

What is the min size for a circular rainwater leader?

A

2”

91
Q

For conversion of a fixture unit loads to litres for pipe sizing purposes, 260 FU or less is equal to ____ L?

A

2360

92
Q

When the number of FU exceeds 260 FU, the load is ____ litres from each fixture unit

A

9.1

93
Q

A pump rated at 10 gallons per min would add a load to the combined sewer ____ liters

A

681
45 x 15 min = 681L

94
Q

How many fixture units are allowed to connect to the vent stack?

A

8

95
Q

How high must a building be before a vent stack is required?
2.5.4.2 (1)

A

5 storeys
“More than 4 storeys”

96
Q

How is a bathroom group sized when tied in to the vent stack?

A

wet vent

97
Q

How far above the floor level of the lowest storey of the section the yoke vent shall be connected to the vent stack?

A

1m

98
Q

Yoke vents are required on buildings of what height?

A

12 storeys
(more than 11 storeys)

99
Q

What is the min size of a fresh air inlet?

A

4”

100
Q

When circuit venting 3 drinking fountains, what would be the size of the fixture drain immediately downstream of the circuit vent connection?

A

2”

101
Q

What are the NPC intended for?

A
  • ensures the quality / functionality of plumbing installations
  • protects the health of the occupants / general public
  • Protects building structure from damage caused by improper piping installation.
102
Q

What does AHJ mean?

A

Authority having Jurisdiction

103
Q

When does testing + inspection need to be done?

A

Once piping rough-in has been completed (ground work or above grade)
(piping needs to be under a test while being inspected)

104
Q

What are the 4 main tests that may be performed on a DWV system?

A
  • Water pressure tests
  • Air pressure tests
  • Final tests
  • Ball tests
105
Q

How much water column must be applied to all joints?

A

3m (10’)

106
Q

How long does a test need to be
done for?

A

15 min

107
Q

How much pressure does a air pressure test need?

A

35 kPa (5 psig)

108
Q

For final tests, what water column must be maintained for 15 min?

A

25 mm (1”)

109
Q

When a pipe is 3” or more, what size of ball is used for a ball test?

A

min 2” (50mm)

110
Q

When a pipe is 3” or less, what size of ball is used for a ball test?

A

1” (25mm)

111
Q

What is this?

A

A drop head auger

112
Q

What is a drop head auger used for?

A

For cleaning the trap arms of fixtures mounted back-to-back

113
Q

What is this?

A

A spade cutter

114
Q

What is a spade cutter used for?

A

Following up after augers have been used / to open up floor drains

115
Q

What is this?

A

A shark-tooth cutter

116
Q

What is a shark-tooth cutter used for?

A

For cleaning pipes of general material clinging to pipe walls

117
Q

What is this?

A

A grease C cutter

118
Q

What does a grease C cutter used for?

A

For grease blockages in lines leading from garbage disposal units or waste pipes

119
Q

What is the best tool to use when you suspect that a building sewer is frozen b/c it isn’t buried deep enough?

A

A steam cleaning machine

Plumbing Level 2 (8 decks)

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