Plumbing Mt Flashcards
A secondary stack vent in a commercial building serving a 3” soil stack shall be a minimum of what size?
1 1/2”
what is the maximum number of circuit vented branch traps that can be installed between a circut vent and a relief vent:
8 traps
the following rule applies in order to be able to size a relief vent:
One size smaller than the circuit vent
The national plumbing code is a set of written standards which:
set minimum standards
the minimum size of individual vent serving a 4” P trap
1 1/2”
The maximum length of a 3” trap arm serving a floor drain at minimum grade is:
3.75M (12ft)
When is a backwater valve required?
ON fixtures below grade
The flow from a pump into a storm drainage system is taken as:
1 L/s = 900L
If a Flat roof was 20m long and 18m wide and the adjacent wall surface was 25m Long and 9m high, what size storm building drain would be required at 1 in 100 slope (25mm/15min)
6”
If a flat roof was 11m long and 20m wide and the adjacent wall surface was 14m long and 9m high, what size leader would be required? ( rainfall 20mm/15mm )
4”
What CCC protection is required for the Washdown Ventilation Hood
RP
The Flight Machine (A) has an operating temperature of 77 deg C for pumping water through equipment for at least ___________?
5 min
What is the minimum size branch discharging from the Food Display Sink (H) ___________?
1 1/4”
The Orifice Flow Control Plate (M) is designed to?
CONTROL THE LAMINAR FLOW INTO THE TRAP
What is the maximum number of flush tank water closets that could drain from the fifth storey of a building into a 3” soil stack?
4
Piping that is too low to drain by gravity into the sanitary building drain is called
sub drainage piping
When sizing a combined sewer, how do you convert from FU to litres?
260 FU and less counted as 2,360, over 260 multiply 9.1
The maximum number of fixture units that may drain into a soil or waste pipe that is being used as an alternate relief vent is:
6
What is the minimum height (in inches) of a vent terminal above the flashing?
6
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:
100
- What is the minimum size cleanout serving a 4” branch?
3”
A trap is required for a subsoil drainage pipe if:
it drains into a combined sewer
The maximum number of FU’s that may drain into a vent stack at the lowest storey is:
8 Fu
A 4” circuit vented branch has 3 water closets that are circuit vented and has 25 FU discharging above and downstream of the circuit vented branch. This soil or waste pipe will be used as an alternate relief vent?
False
A branch with a load of 3 FU is drained to a stack from the tenth floor of a building. What is the minimum size of the stack?
2”
A vent stack is needed when fixtures discharge from _____ or more storeys.
5
The fixtures that may drain into a vent stack must be located:
on the lowest storey it serves
A vent stack shall connect to the soil and waste stack:
at or below the lowest soil pipe connecton
Yoke vents for vent stacks is required when a soil or waste stack receives the discharge from fixtures located on more than how many stories?
11
If a continuous appliance has pumped discharge of 20 L/s, what would be its fixture unit rating?
20 x 31.7
When sizing a combined sewer, a sanitary FU load of 195 would be considered equal to how many litres?
2,360 L
Combined sewers are always sized by:
converting fu to litres
The minimum size of a yoke vent for vent stacks is:
one size smaller than the smaller pipe to which it is connected
A service sink is installed with a
2”?
A soil-or-waste pipe may serve as a wet vent provided that: where a wet vent extends through more than one storey, the total discharge from any one storey above the first storey does not exceed _______ fixture units
4
- A soil-or-waste pipe may serve as a wet vent provided that there is not more than one nominally horizontal offset in the wet vent, and ii) the offset does not exceed ____m for pipes larger than 2 inches in size,
2.5
A circuit-vented branch, including the fixture drain downstream of the circuit vent connection, shall be sized in accordance with Article 2.4.10.7., except that it shall be not less than b) ______ inches, where traps 2 inches in size or larger are circuit-vented.
3
Additional circuit vents shall be required b) where more than ______ circuit-vented fixtures are connected to a branch between vent pipe connections
8
A soil-or-waste pipe may serve as an additional circuit vent in accordance with Sentence (6) provided that the soil-or-waste pipe is sized as a wet vent in conformance with Article 2.5.8.1. and is not less than _________ inches in size.
2
A section of horizontal branch may be circuit-vented provided no soil-or-waste stack is connected to it _____________ of a circuit-vented fixture
upstream
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?
4”
If a commercial washing machine has a semi-continuous flow of 1.5L/s, what is its hydraulic load?
180 Fu
If a fixture has a continuous flow of 0.8L/s, what is the hydraulic load at # 16?
25Fu
A commercial dishwasher is set at what temperature range for sanitizing cycle?
170-185 deg f
While getting your hair cut what CCC device did you notice protecting the hair salon faucet?
Vacuum breaker
What is another name for an accuflow parabolic weir?
flow control roof drain
