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Plumbing 4th Year > Plumbing Mid Term > Flashcards

Plumbing Mid Term Flashcards

1
Q

What is the minimum size of a secondary stack vent in a commercial building serving a 3” soil stack?

A

1 1/2”

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2
Q

What is the maximum number of circuit vented branch traps that can be installed between a circuit vent and a relief vent?

A

8 traps

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3
Q

What is the minimum size of a relief vent?

A

One size smaller then the circuit vent

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4
Q

The National Plumbing Code is a set of written standards which:

A

set minimum standards

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5
Q

What is the minimum size individual vent serving a 4” trap?

A

1 ½”

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6
Q

What is the maximum length of a 3” trap arm serving a floor drain at minimum grade?

A

3.75m (12’)

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7
Q

When is a backwater valve required?

A

on fixtures below grade

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8
Q

The flow from a pump into a storm drainage system is taken as:

A

1 L/s = 900 L

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9
Q

What size storm building drain is required for a flat roof of 20m long and 18m wide at 1 in 100 slope?

A

6”

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10
Q

What size leader is required for a flat roof of 11m long and 20m wide?

A

4”

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11
Q

What CCC protection is required for the Washdown Ventilation Hood?

A

RP

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12
Q

The Flight Machine (A) has an operating temperature of 77 deg C for pumping water through equipment for at least ___________.

A

5 MIN

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13
Q

What is the minimum size branch discharging from the Food Display Sink?

A

1 1/4”

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14
Q

What are the names of the R’s in the food prep sink?

A

Non-concealed standing wastes

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15
Q

According to the plumbing code, what would be the fixture unit load for a flow rate of 12 imperial gallons per minute?

A

29 fu’s

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16
Q

What is the purpose of the Orifice Flow Control Plate (M)?

A

CONTROL THE LAMINAR FLOW INTO THE TRAP

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17
Q

What is the maximum number of flush tank water closets that could drain from the fifth storey into a 3” soil stack?

A

4

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18
Q

Piping that is too low to drain by gravity into the sanitary building drain is called:

A

Sub drainage piping

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19
Q

How is the size of a vent for a sewage pump determined?

A

one size smaller than the largest inlet, at least 2” but no more than 4”

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20
Q

When sizing a combined sewer, how do you convert from FU to litres?

A

260 FU and more multiply by 9.1, under 260 is counted as 2360

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21
Q

What is the maximum number of fixture units that may drain into a soil or waste pipe used as an alternate relief vent?

A

6

22
Q

What is the minimum height (in inches) of a vent terminal above the flashing?

A

6

23
Q

An offset relief vent for soil stack offsets is required when the upper portion of the stack passes through more than 2 storeys and receives a FU load of more than?

A

100

24
Q

What is the minimum size cleanout serving a 4” branch?

A

3”

25
Q

A trap is required for a subsoil drainage pipe if:

A

it drains into a combined sewer

26
Q

What is the maximum number of FU’s that may drain into a vent stack at the lowest storey?

A

8 FU

27
Q

A 4” circuit vented branch with 3 water closets and 25 FU discharging above and downstream will be used as an alternate relief vent. True or False?

A

False

28
Q

What is the minimum size of the stack for a branch with a load of 3 FU drained from the tenth floor?

A

2”

29
Q

A vent stack is needed when fixtures discharge from _____ or more storeys.

A

5

30
Q

The fixtures that may drain into a vent stack must be located:

A

on the lowest storey it serves

31
Q

A vent stack shall connect to the soil and waste stack:

A

at or below the lowest soil pipe connection

32
Q

Yoke vents for vent stacks are required when a soil or waste stack receives discharge from fixtures located on more than how many stories?

A

11

33
Q

If a continuous appliance has pumped discharge of 20 L/s, what would be its fixture unit rating?

A

20 x 31.7

34
Q

When sizing a combined sewer, a sanitary FU load of 195 would be considered equal to how many litres?

A

2,360 L

35
Q

Combined sewers are always sized by:

A

converting fu to litres

36
Q

The minimum size of a yoke vent for vent stacks is:

A

One size smaller than the smallest pipe to which it is connected

37
Q

A service sink is installed with a:

A

2” p trap

38
Q

A soil-or-waste pipe may serve as a wet vent provided that the total discharge from any one storey above the first storey does not exceed _______ fixture units.

A

4

39
Q

A soil-or-waste pipe may serve as a wet vent provided the offset does not exceed ____m for pipes larger than 2 inches in size.

A

2.5

40
Q

A circuit-vented branch shall be not less than ______ inches, where traps 2 inches in size or larger are circuit-vented.

A

3

41
Q

Additional circuit vents shall be required where more than ______ circuit-vented fixtures are connected to a branch between vent pipe connections.

A

8

42
Q

A soil-or-waste pipe may serve as an additional circuit vent in provided it is sized as a wet vent and is not less than _________ inches in size.

A

2

43
Q

A section of horizontal branch may be circuit-vented provided no soil-or-waste stack is connected to it _____________ of a circuit-vented fixture.

A

Upstream

44
Q

The roof is 18m x 14m, the adjacent wall is 4m x 14m and rainfall is 23mm/15min. What is the minimum size of RWL?

A

4”

45
Q

What is the hydraulic load of a commercial washing machine with a semi-continuous flow of 1.5L/s?

A

180 FU

46
Q

If a fixture has a continuous flow of 0.8L/s, what is the hydraulic load at # 16?

A

25 FU

47
Q

What kind of sump is illustrated at # 23?

A

Storm sump

48
Q

What size is the wet vent portion of a relief vent for a circuit vented branch with 3 - 2 headed showers. 1 - 3” emergency floor drain and 2 closed coupled WC. The wet vent portion of the RV had 2 lavs draining into it.

A

2”

49
Q

A commercial dishwasher is set at what temperature range for the sanitizing cycle?

A

170-185 deg f

This temperature range is critical for effective sanitization.

50
Q

While getting your hair cut, what CCC device protects the hair salon faucet?

A

vacuum breaker

A vacuum breaker prevents backflow in plumbing systems.

51
Q

What is another name for an accuflow parabolic weir?

A

flow control roof drain

This device helps manage water flow on roofs.

Plumbing 4th Year (6 decks)

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