Red seal 3 Flashcards
what is the manganese green sand filter used for:
to remove ferrous iron, manganese and hydrogen sulphide.
A wet stand pipe system requires which CCC device, when pipes are not susceptible to freezing?
DCVA
which is the first take off on common water service system?
fire sprinkler
the minimum vent height for a RV dumping station is in meters:
2m
when sizing a water softener, how many gallons are consumed by 4 people in a house?
240
what type of waste does a sterilizer give off?
acidic
what’s the minimum size water supply to a urinal flush tank?
3/8”
whats the minimum pipe size for a medical gas piping?
1/2”
hydrogen sulphide is removed by?
manganese zeolite filters, aeration, and chlorination.
an activated carbon filter removes?
Taste and odour
iron can be removed by?
water softener
polyphosphate
Iron filler
what is a maintenance bond purpose?
to ensure good workmanship
What is the name of the quick connect adaptor used on a well system with series 160 PE piping?
Pitless adaptor
the flow from a wash down ventilation pump into a drainage system is taken as:
1L/s =31.7Fus
what is draw down?
the measured depth that water in the well lowers when the well is being pumped (used).
if a pipe from the well to the house is not graded properly:
its difficult to maintain pressure and prime the pipe
on a wall hung water closet, the distance from the face of the wall to the bowl is set by:
back up nuts and washers
A PVB is installed how high above the critical level?
12”
every acid waste trap, must have a water seal of at least:
2”
the minimum size of the water distribution pipe in a building is:
1/2”
the minimum protection used when incorporating a pre-rinse sink would be:
An AVB (atmospheric vacuum breaker)
Every oil interceptor, shall be provided with vents that:
extend to open air
connect to the interceptor at opposite ends
terminate at elevations differing by not less than 300mm (12”)
A cleanout for a trap, which serves a leader or a sub-soil drain is installed:
over the trap upstream of the trap
one trap may serve a group of floor drains, showers or laboratory sinks provided:
all fixtures must be in the same room
What is installed on a centrifugal pump to prevent the water from draining backwards?
Check Valve
to lower the PH you need to use:
a Neutralising filter
The maximum number of flushometer WCs, that can discharge into a 80mm (3”) stack is:
6 WCs
How many RWLs are required for a 40 m x 40 m roof, that uses flow controlled roof drains.
(rainfall intensity is 20mm per 15 mins.)
2
why is there salty water after the regenration cycle on a water softener?
the rinse cycle is too short
All the waste openings that serve a 3 compartment sink are 1 1/1’ what is the minimum size of trap?
2” (2.4.9.3. [2] )
what is required when installing long, straight horizontal or vertical runs of copper domestic hot water piping?
expansion joints
the rule for air breaks sizing:
1” or the same pipe diameter
what is the purpose of pressure balancing valves?
to prevent scalding
what is the minimum size for a building drain?
a - 2”
b - 1 1/2”
c - 4”
d - none of the above
none of the above
2 back to back WCs are roughed in at 254mm from the finished walls. if the partition is 125mm hollow tile and the wall finish is 19mm what is the c-c distance of the sleeves?
254 x 2= 508mm
19 x 2= 38mm
partion=125mm
ALL EQUALS 671mm
what material is best for a corrosive waste tank?
corrosion resistant concrete
what is the distance between labels on medical gas lines?
20’
An underground water service is installed using thrust blocks. What additional method could be used to restrain the joints?
1/2’ ss continuous rodding
A cold water pipe is offset 1.2m using 45 degree elbows. What is the approximate length of the diagonal pipe?
1.2m x 1.414m = 1.7m
What equipment is required if coliforms are detected in a water system?
Chlorinator
what is the name of the part of the blueprint which gives the details of fixtures and appliances:
equipment plan
What is the minimum air gap for a 2” pipe?
100mm (2x the diameter of the pipe) [2.6.2.9. (2)]
What is the test protocol for a residential sprinkler system?
Min 200 psi or 50 psi over working pressure for at least 2hrs
A heating system requires an in-line flow switch. Where would this type of switch be located?
Supply main
When a gas line passes from one building to another building, where is it necessary to install a gas cock?
the exit and entry points of each building
What is the manufacturers recommended maximum length of 3/4” heat pex tubing in a radiant heat floor system?
500ft
what size of condensing unit would be required for a building with a heating load of 54,000 BTUh?
4.5 tons
How does the finned baseboard in a hydronic heating system heat the room?
convection
what size of urinal flush tank in gallons is required for 4 urinals?
5 gallons
if a six impeller stage pump was replaced with a nine impeller stage pump what would the outcome be?
psi increase of almost 30 psi
what is the minimum amount of showers required for a public pool?
3
If pressure in the top floor mechanical room was 235 kPa and the building was 22m tall what is the pressure in Kpa at the bottom of the building?
455 Kpa FIGURE THE MATH
When testing medical gas lines, what do you test for?
Pressure, cross-connection, contaminant, and Flow
What is the best way to check for iron in a water system?
In the toilet tank
Name 3 most common materials used to make septic tank?
concrete, fibreglass, and polyethylene
What occurs in the septic chamber?
Anaerobic bacteria breakdown
What is the maximum layer of scum in inches that insulates the tank?
9”
Yoke vents are required on buildings of what height?
more than 11 storeys?
How far must a water meter be from any entrance, wall or grade wall in inches
12”
how is an offset relief vent for an offset sized
an Offset vent for an offset is sized to be one size smaller than the stack vent and must comply with 2.5.7.1.
What valve is requires that interconnects the hot downfeed and recirc line when the lower floors are supplied by hot downfeed system?
Balancing valve
Any macerating toilet has what size of a drain?
3/4”
How many backwater valves does an elevator pit require that drains into an empty sump pit and into a lower building drain?
2
When sizing a 7 m offset in a RWL, which table do you use?
2.4.10.9
an oil interceptor occasionally is connected to an oil secondary receiver. what is the minimum size of an oil secondary receiver’s vent?
1 1/2”
An air admittance valve shall be located not less than ______ mm above the fixture drain being vented?
100mm
Every commercial building shall have a premise protection by which CCC device?
DCVA
What device on a Jacuzzi that is used with the pump to produce the rate of flow through the jets?
Air Volume switch
what temp should a drinking fountain be?
10 degree C
what is the recommended length in time of flush for a urinal?
3-5 secs
What is the advantage of using a plastic nut and washer rather than a steel nut and washer for fastening a two-handle faucet to the fixture?
if the faucet should leak around the stem, a plastic nut and washer will not deteriorate as a metal nut and washer would
The NPC stipulates that bath tub faucets must be restricted to what maximum flow temp?
120 degree F (48.9 degree C)
What is the minimum size of supply line required for diaphragm flush valves used on urinals.
3/4”
what must be taken into consideration when mounting a booster domestic water pump on the floor?
noise and vibration transmitted through building
Why must a strainer be installed on the main or high-pressure side of a PRV?
to prevent dirt from becoming lodged between the PRV and the seat and disk.
What is the most important issue when trying to locate a PRV in a 20 storey building, where the mechanical room with hot water tanks are located on the floor of a downfeed system?
.433psi/ft allowance for pressure gain or loss to calculate the PRV location
what is the advantage of a two pipe lines drawing to a single line drawing
easier to interpret
How to keep a submersible pump from overheating?
make sure it pumps below the drawdown line.
what pump is designed primarily for shallow well applications?
single pipe jet pump
what is an indication of hard water?
scale on bathroom fixtures
What does the red seal represent?
represents excellence and provides greater mobility across Canada for skilled workers
