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Plumbing Level 3 > LT: Install piping for Sewers > Flashcards

LT: Install piping for Sewers Flashcards

1
Q

The plumbers responsibility ends where for a drainage system?

A

Property line

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2
Q

What is the main purpose of a sanitary sewer?

A

To carry liquid / solid waste away from homes and businesses –> direct to final tx aka wastewater treatment plants

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3
Q

Who is in charge of the system that starts at the property line and ends where effluent is returned to the earth?

A

The Municipal or city

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4
Q

What are the 3 different types of sewer systems?

A

1) sanitary sewers (black water)
2) storm sewers
3) combined sewers

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5
Q

What type of sewer is crucial in the prevention of flooding?

A

Storm sewer drainage system

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6
Q

How do storm sewer drainage systems help prevent flooding?

A

Diverts excess rain / groundwater –> run off from parking lots, roofs, paved streets / sidewalks to nearby waterways via drains and underground pipe system.

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7
Q

True or false: sewage and storm water are channeled via same pipe / terminates in a sewage tx plant and poses problems

A

True

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8
Q

Where are combined sewers mostly seen?

A

In areas where it is difficult / impossible to direct storm water to safe disposal locations aka river or lake

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9
Q

Who gives the okay to install combined sewer systems?

A

Authority having jurisdiction

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10
Q

Combined building drain must travel how far outside a building before it becomes a combined building sewer?

A

1m

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11
Q

What 2 other names does Asbestos cement go by?

A

White pipe
Transite

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12
Q

Polyolefin is used in what kind of places?

A

Lab Line –> for corrosive waste drainage systems

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13
Q

What are the most common ABS pipe lengths?

A

12 ft and 20ft
(10ft) also available - not common

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14
Q

What does thermoplastic mean?

A

It can be softened / reformed

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15
Q

What does HDPE mean?

A

high - density polyethylene

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16
Q

What are some fun facts of HDPE pipe?

A

noncorrosive, highly flexaible, joints are heat-fused or bell/spigot or mechanical and has a low failure rate

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17
Q

What does RCP stand for?

A

Reinforced concrete pipe

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18
Q

What is RCP used for?

A

used in municipal gravity systems

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19
Q

What are the downsides of concrete piping?

A

It is susceptible to H2S and can corrode in extremely acidic soil

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20
Q

At what depth do Trenches and Excavation pits require a protective system aka sloping or shoring?

A

4 ft (12m) –> in BC

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21
Q

What is the definition of Confined spaces?

A

Has limited or restricted means for entry or exit (access/egress) that may complicate the provision of first aid, evacuation, rescue or other emergency response service

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22
Q

What is the first thing to do for Confined space?

A

Getting a permit

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23
Q

What types of spaces require a permit

A

hazardous atmosphere, potential for engulfment or suffocation or safety or health hazards

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24
Q

What is the next step after requiring a permit for Confined space?

A

identifying entry and exits

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25
Q

True or False: a septic tank is considered a confined space.

A

True

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26
Q

What 2 things are air quality hazards in confined spaces?

A

Insufficient amount of oxygen
toxic gases - make ill / lose cx

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27
Q

What is included in Pinch points?

A

commonly fingers / hands but can also involve any area of the body

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28
Q

What is a common cause of pinch points?

A

Walking or working in area w/ mobile equipment / fixed structures

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29
Q

Do we still see technologies used in past centuries?

A

yes

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30
Q

What are new innovated sewer systems called?

A

(Alternative) wastewater collection system

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31
Q

What does wastewater collection system include? (P-V-SD)

A

pressure sewer systems, vacuum sewer systems / small diameter gravity sewer systems

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32
Q

What is the most used sewer system used worldwide?

A

Gravity sewer systems

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33
Q

Pressure sewer systems aka sumps are commonly used where?

A

where the building sewer elevation is higher than the drainage pip feeding into it

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34
Q

Where does a plumber’s responsibility for a drainage system on private property end?

A

At the property line

35
Q

What system contains both sewage from toilets / rainwater from roofs / parking lots.

A

Combined drainage systems

36
Q

What type of pipe was used in the earliest form of municipal waste systems / are still used where corrosive wastes may be expected?

A

Vitrified clay

37
Q

What type of pipe is limited to use on private property because of the small diameters available

A

ABS

38
Q

What is the most immediate concern when entering a confined space?

A

Air quality (PERMIT)

39
Q

What is the purpose of a lift station in a municipal sewer system?

A

It pumps sewage from a deep sewer to a higher elevation

40
Q

What is the most common type of sewer system in both private / municipal use?

A

Gravity

41
Q

A FU is equal to what?

A

1 cubic foot of water through 1 1/4” OD pipe in 1 min

42
Q

What are the units of measure used to size pipes in storm or combined system?

A

L/15 min

43
Q

Where would you find the local rainfall intensity for a city or area?

A

Weather channel

44
Q

What information would one consult if calculating the discharge rate from flow control roof drains?

A

the manufactures specs

45
Q

What are the units of measure used to size pipes in a sanitary system

A

Fixture units

46
Q

What is the conversion factor to be used to represent the flow via a combined building drain from not more than 260FU?

A

2360 L / 15 min

47
Q

What is the conversion of 300 FU flowing through a combined building drain?

A

2730 L / 15 min
(9.1 L/min)

48
Q

If a fixture discharging CWW drains into a sanitary building drain, What is that pipe now called?

A

combined building drain

49
Q

What is the most common grade for above / below ground horizontal drainage pipe that helps ensure solid waste will be carried away by the liquid flow?

A

2%

50
Q

What is the min flow velocity?

A

0.6m/s (2.0 feet/sec –fps)

51
Q

True or false: Pipes smaller than 8 inches require a manhole.

A

False - they require acceptable pipe configuration
wye + 1/8th bend

52
Q

What is the best way to install sewer pipe?

A

one section at a time

53
Q

When using bell / spigot pipe, is the bell installed upstream or downstream?

A

Upstream - code + decreases blockages

54
Q

What is required if a new building has any fixtures located lower than street level?

A

Backwater valve

55
Q

Are backwater valves installed normally open or normally closed?

A

Normally open

56
Q

True or false: Plumbers are responsible for 300mm (1’) of backfill.

A

True

57
Q

What does RCP mean?

A

Reinforced concrete pipe

58
Q

Where is RCP used?

A

storm sewers systems / sanitary systems

59
Q

What should be lubricated after installment?

A

pipe bell also spigot or tongue end

60
Q

What would be the grade on a sanitary sewer that is 60m long if the starting elevations were 72.875m and 71.350m?

A

2.5%
72.875 - 71.350 =
ans / 60 =
ans x 100

61
Q

What kind of pipe allows heavy loads on top and has a shallow burial depth (under public roadways)

A

RCP

62
Q

What is considered a normal manhole?

A

A manhole w/ an overall depth greater than 0.9m (3ft) but not more than 2m (6ft)

63
Q

True or False: manhole openings are the smallest point

A

True - so the manhole lids fit

64
Q

What are 2 things that a manhole installed inside require?

A

needs a vent to exterior
vent that is min 2”

65
Q

Do the inlet and outlet elevations differ on sanitary manholes?

A

Yes, only by the amount of grade required to allow flow by gravity bn them

66
Q

True or False: the flow through a sanitary manhole must be channeled

A

True

67
Q

What is a Lamp manhole?

A

is a small opening on a sewer that is extended vertically to the grounds surface for the purpose of lowering a lamp or light inside it?

68
Q

Where are lamp hole needed?

A

In places where inspection of the flow in needed

69
Q

True or false: Catch basins are storm sewer inlets that have a specific function

A

true

70
Q

What is the purpose of a catch basin?

A

catch surface water and direct it into a storm sewer system

71
Q

Where are catch basins located?

A

at low points on public / private property
next to street curbs, in parking lots/ at bottom of sloping driveways

72
Q

What would a manhole w/ a depth of 1.5m (5’) be classified as?

A

a normal manhole

73
Q

According to the NPC a manhole installed w/in a building must have what also installed?

A

a vent

74
Q

What feature of a concrete sanitary manhole is not usually found in a storm manhole?

A

sculpted channels

75
Q

What type of catch basin has a shape that is usually long / narrow?

A

a driveway catch basin

76
Q

When would a rigid ladder or a corrosion resistant material need to be installed?

A

where depths exceed 1m

77
Q

What is the min horizontal dimension of a manhole?

A

1m except at the top 1.5m can be tapered from 1m –> 600mm at the top

78
Q

What does the ‘B’ stand for in CSA B70.1?

A

that it is CSA standard

79
Q

What is the grade for storm water / trenches?

A

min 1% approx. 1/8”/foot

80
Q

According to the NPC / BCPC, what is the min horizontal dimension of a manhole?

A

1m

81
Q

According to the NPC / BCPC, a ladder is required to be provided w/ a manhole if it is over what min depth?

A

1m

82
Q

What is the area surrounding the channels in a sanitary manhole called?

A

Benching

83
Q

What do some installed use as a form for the channels in a sanitary manhole, if they are not precast into the base?

A

Pipe that is the same diameter as the channel

Plumbing Level 3 (26 decks)

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