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Theory > Plumbing Theory > Flashcards

Plumbing Theory Flashcards

1
Q

Minimum size cleanout for 8” pipe

A

4”

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2
Q

Min size clean out for a 8” building sewer

A

Manwhole

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3
Q

Min size building drain

A

3”

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4
Q

How many wcs till bd is 4”

A

3

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5
Q

How far must a vent terminal be from a fresh air inlet?

A

1m above 3.5m away

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6
Q

What does a backwater valve protect?

A

Fixtures below grade

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7
Q

Do slab on grade buildings need a backwater valve.

A

No

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8
Q

Min size bs sewer connected to a public sewer?

A

4”

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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

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10
Q

Min size building drain?

A

3”

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11
Q

A continues vent is?

A

A vent pipe that is an extension of a vertical section of branch or fixture drain

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12
Q

Backwater valve needs to be?

A

Redilly accsesible

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13
Q

A branch vent is best defined

A

A junction of two or more vent pipes

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14
Q

Min size cleanout serving 4

A

3inch

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15
Q

Max cumilitive change of direction on kitchen sink for cleanout food receptical

A

90degrees

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16
Q

Where do you have 135 degrees of comulitave change

A

Trap weir to vent fitting

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17
Q

Max distance between 4” barret clean outs on bd is?

A

100’ 30m

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18
Q

Min size roof terminal where subject to frost closure?

A

3”

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19
Q

Horzontal dwv plastic support?

A

1.2 meters (4feet)

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20
Q

Why are vents upsized before leavint building

A

Frost

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21
Q

Min size vent for 4” trap

A

1 1/2

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22
Q

Max change on wc

A

225 degrees

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23
Q

Trap arm is from

A

Trap weir to vent fitting

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24
Q

Min wize wet vent

A

1 1/2

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25
Q

Vents are installed to

A

Prevent back pressure

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26
Q

Min size wet vent serving a wc and a basin is?

A

2 “

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27
Q

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

A
  1. 2 m

2. 5 m for larger than 2”

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28
Q

The largest size trap arm or fixture drain that can drain into a wet vent?

A

2” normally unless 3” emergency floor drain

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29
Q

Maximum amount of tank type wc that drain into 3” wet vent?

A

None. They can be vented but not wet vent

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30
Q

A trap is reauired on subsoil drainage if

A

It drains into combined sewer

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31
Q

What is the proper order of fittings on a sump discharge (with direction of flow)

A

Union, check valve, fullport valve (ball valve, gate valve)

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32
Q

A subsoil drainage system that is connected to a storm sewer must have

A

A backwater valve

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33
Q

Thermostat in domestic water heater normally set at what tempature?

A

140F 60C

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34
Q

Dip tube has small hole on hw t

A

To prevent siphoning on the hot water tank

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35
Q

The discharge tube from a hw heater should be

A

End within 12” 300mm

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36
Q

Tmp relief valve on hwt is openned at

A

210f 150 psi 99c

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37
Q

Main purpose of dip tube on hwy

A

Prevent cold water from mixing with hot water

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38
Q

Testing water system with air?

A

700kpa 100psi for 2 hours

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39
Q

What needs a shut off valve fixture

A

Wc

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40
Q

Pres reg valve should provide downstream pressure of no mor than

A

80 psi

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41
Q

Min size water sevice allowed?

A

3/4”

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42
Q

Min water supply tubing for bathtub or shower

A

1/2”

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43
Q

Water line fu rating for a domestic clothes washer?

A

1.4 fu

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44
Q

What is the maximum tempature settinf for bathrub or shower

A

120f 49c

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45
Q

A cast iron service sink is installed with preferable

A

3” p trap standard. Minimum is 2” p trap

Made of cast then sprayed with enamel porcelain paint

46
Q

What type trap is perfered for mop sink

A

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
Q

Why does a clothes washer have a loop

A

To stop from self draining

48
Q

Min hight and diameter of lsp is?

A

24” min 600mm 36” max and terminates above flood level rim. Measured from trap weir.
2” diameter

49
Q

Two types of garborstors

A

Continues feed and batch feed. Stopper off on batch wont work

50
Q

Garbage grinder must be drained into?

A

A trap.

51
Q

Can A vent pipe be erected outside a building as apposed to through the roof

A

Yes. True

52
Q

A service sink faucet generally include

A

Integeral stops, hose thread on spout, vacuum breaker, wall bracket.

53
Q

What is a branch?

A

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
Q

What is a branch vent?

A

Two or more dry vents connecting together but if on top of stack, stack takes presidence so its called a stack

55
Q

What makes a vent header?

A

Two stack vents

56
Q

Hot water velocity in distrinution piping in a residence?

A

1.5 fu velocity

57
Q

What fixture has a 2.2 fu velocity?

A

Wc

58
Q

What fixture has a fu velocity of 2.5?

A

Hosebib

59
Q

Min size cleanout for bs ?

A

4”

60
Q

Min size bs cleanout for 4”bs

A

4” cleanout

61
Q

Max length on 3” fld

A

Shorter than 12 feet to vent through the building drain

62
Q

Tests for dwv include?

A

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
Q

Whats a top snake?

A

Hand opperated drain cleaner

64
Q

After use on drain cleaner what should be done to the cable?

A

Sprayed with corrosion protection

65
Q

For operator saftey, Larger electric drain cleaning machines are controlled on/off by a ?

A

Captive air bulb saftey switch

66
Q

First tool into a drainage line containing an unknown blockage should be.

A

Sampling or inspecting tool

67
Q

How is the distance (fall) from the vent and the trap sized?

A

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
Q

Minimum distance between a vent and a trap?

A

Twice the the size of fixture drain

69
Q

What is a storey?

A

Two floors

70
Q

What is a soil or waste stack?

A

A soil or waste pipe that goes through atleast 1 storey

71
Q

What can cause a fixture to self siphon?

A

Trap is too far below fixture. Canadian Max is 1200mm in alberta only 900m (36”)

72
Q

Min trap seal depth?

A

1 1/2 or 38mm

Or 2” for acid waste 50mm

73
Q

When is the artiel loop distribution system used by municipalities

A

When there is heavy demand on the system

74
Q

How do you protect changes in elavation or direction on a water distribution line?

A

Thrust blocks and anchors

75
Q

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?

A

Closed system, a diaphram/expansion tank is now needed.

76
Q

What is the minimum size of water service distribution piping to a water heater serving more than two fixtures ?

A

3/4”

77
Q

When do you need a reserculation line?

A

4 storeys, or 30m developed length

78
Q

A stack vent is measured by?

Min size?

A

The developed length from its lower end to outside air

Half the size of soil or waste stack at its base.

79
Q

Max pressure for a fixture in water distribution system is?

A

550kpag and pressure reducing valve maintains that if it has excess pressure.

80
Q

When will a meter bypass be installed?

A

When the meter is larger then 1 1/4

81
Q

Smallest service pipe allowed in water distribution?

A

3/4”

82
Q

Hot water tanks ussually have a maximum working pressure of?

A

150 psi

83
Q

The information needed for sizing water distribution system is?

A

Pressure at building isolation(min 200kpa)

Distance from main to furthest fixture

84
Q

How are hwt sized?

A

Number of building occupants

85
Q

A vacuum breaker on a hwt does what?

A

Replace small whole drilled in dip tube

86
Q

After installation of water lines you should?

A

Flush all lines, including clothes washer and dishwasher lines

87
Q

Minimum size continues vent?

A

1 1/4

88
Q

What tables are continnues vents under?

A

2.5.8.3 and then cross referanced 2.5.7.1

89
Q

What tables are wet vents sized from?

A

2.5.8.1

90
Q

2.5.7.1 is what table? What vents are sized by 2.5.7.1?

A

vents size based on trap served.

All vents

91
Q

The minimum size building cleanout is?

A

4”

92
Q

Minimum slop a trap arm can be installed at?

A

2%
1/50
1/4”/ft

93
Q

How are trap arms sized?

A

The size of the fixture outlet pipe

94
Q

A water closet must be in a room with what?

A

Lighting and ventilation.

A dwelling needs a lav

95
Q

Min size wet vent serving a wc?

A

2”

50mm

96
Q

How far generally is the toilet mounted off finish wall?

A

12” 300mm

97
Q

Why is a tank on wc insulated?

A

Stop condensation from forming on the outside of the tank.

98
Q

Where do you find specs on space requirement on wc?

A

Manufactures rough in book

99
Q

What is the maximum size trap arm of a minimum size floor drain?

A

2.4 m or 8ft for 2”
3 m or 12ft for 3”
10m 32 ft

100
Q

When can you have floor drain trap arm that is 2 pipe diameters to 18”

A

When it has its own vent.

Otherwise connected through bd and must be 18”

101
Q

Max amount of fixture units drained from any 1 storey

A

4 f.u

102
Q

A wet vent will be sized according to what table?

A

2.5.8.1

103
Q

What must be known to size a building drain?

A

Total fixture units and grade

104
Q

How do you size a continues vent?

A

Developed length and amount of f.u its venting, then sized according to largest trap served

105
Q

What is the minimum supply pressure to a fixture?

A

50kpa 7psi

Maximum is 550 kpa

106
Q

Max amount of f.u drained into a 3” building drain

Horizontal

A

27 f.u

102

107
Q

Minimum size wet vent venting a wc.

A

2”

108
Q

Max fixture unit load from any one fixture drained into a wet vent?

A

2 f.u

A 2 f.u urinal may be drained into a wet vent as long as its within the 8 ft.

109
Q

Minimum size garbage grinder?

A

1 1/2” resi

2” comercial

110
Q

What additional fixture should be supplied with a clothes washer?

A

Floordrain

111
Q

Min Size trap on 3 compartment sink?

A

2”

Common trap arm to all three sinks must be one size larger than the largest fixture outlet pipe being served.

Theory (1 decks)

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