Plumbing RD & TQ Flashcards
theoretical lift is 12.75 psi, How many feetof head is this?
29.44ft/h
12.75 X 2.31 or 12.75/.433
what decides the speed of the drill?
type of material
what is the standard cut in/cut out of a pump?
30/50
What is the purpose of the compound wrench?
More leverage
What is the 1/4inches tap hole on the top of a well casing?
vent
1.6m offset with 2 90’s, if you use 2 45’s, how much pipe will you save?
2 x 1.6= 3.2
1.414 x 1.6 = 2.2
you’ll save 1
Medical copper pipe should be?
degreased and capped
Who would be involved for testing gas piping?
CSA
What is the trap size of the three compartments sink?
2”
1 1/2” outlet pipe, 2” trap, 2 fus
Minimum vertical pipe drop allowed on a toilet?
1000mm
What kind of knot is used for a tag line?
Bowline
What is the minimum size of a sump vent when the sub building drain
is 2”?
2”
Where is the vacuum breaker on a mop sink?
Integral part of the
faucet
The best protection for cross-connection at the marina?
RPBA
If water is coming out of the atmospheric port of a RPBA, what is happening?
High demand downstream or the second check is partially kept
open because of debris
If the fire pin on powder actuated tool is defective, what to do?
Put it out of service and get it fixed by approved technician
What is the layer of scum for in a septic tank?
insulation
If there were a small amount of scum in the tank, what would cause
it?
Large amount of soap and detergent used
What kind of pump is used from the tank, to the field?
centrifugal
Flow control valve in front of the grease interceptor, what is it
for?
Reduce flow
If pump looses pressure without any demand( opening of a faucet ), what is it?
Foot valve is leaking
Water hammer occurs in a residential house with quick closing
valve, what should be done?
reset shock arrestors
Suction pipe is 1 ¼, what is the drive line size?
1”
Minimum size for a water supply on a water softener?
3/4”
Minimum water pipe for a tub?
½”
when is the t&p valve is going to open on a HWT?
at max working pressure
Best and fastest way to test cast iron fittings?
tap with hammer
What is the 90 degree at the end of a sump tank for?
Discharge the
clearest effluent in the effluent chamber
What is the advantage of a two pipe lines drawing compare to a
single line drawing?
easier to interpret
How do you find canning sleeve after the concrete as been poured?
grid lines
Where there is a change from cast iron or copper to abs stack going
from one floor to another, what do you need?
expansion joint
Max. size of pipe that can be hung with strapping?
4”
What do you use a spiral reamer for?
Burrs on the inside of pipe
At what depth do you need shoring?
1.5m or 5 feet
if you have a 6” stack and a 3” vent stack connected by a relief
vent, what is the size of the relief vent?
2 1/2”
Relief vents are 1 size smaller then the vent stack
What type of solder on a extracted tee?
brazed
Why do you put a sacrificial anode in the ground right beside the other pipe?
for cathodic protection
From what do you have to protect two dissimilar metal like copper
pipe with metal hanger?
dialectic union
What kind of wrench do you use with chrome finish?
strap wrench
Minimum water supply size for a urinal for a direct flush valve?
3/4”
Minimum length of a 4” floor drain?
18”
Where would you have shut-off valve in a public building?
At every
fixture or a group in the same room
What would most likely be the problem if water was ( slowly )
constantly running into the bowl of a water closet if the level in the
tank is ok?
flapper is leaking
Maximum temperature allowed in a drain?
75 deg C
What type of screw do you use to bolt down a water closet?
brass T bolt
How do you make sure that you have a space in between the wall hung
w.c. and the wall?
back up nut and washer
What must be indirectly connected to the drainage?
sterilizer
can you repair a broken chain
no
If one zone in a house is not getting heat, what causes it?
check the end and flow switches
If the boiler is down the main floor and the heating unit upstairs
is not giving heat and the main floor is ok( having lots of heat),
what’s the problem?
air in unit
Why would it be detrimental to potable water to store it after it
is being treated buy a reverse osmosis?
acidic
Which of the system would have the most equal piping in every zone? Which of the system would have the most equal piping in every zone?
Reverse return
THIS IS ALWAYS BEST
ANSWER
Hose bibb faucet needs to be frost free with a stop and drain
inside the building
NO answer just staement
If you lack of pressure on a flush valve, what do you do?
open the shut off valve more
how do you test water system?
700kpa for 2 hrs with potable water
700kpa = 100psi sodt
What type of waste does a floor drain receives when connected to a
storm system?
clear waste water
If a trap if being siphoned, what would you check first?
What kind of equipment do you need to test a cross connection
device?
what regulates flush times on a flush tank?
Fill valve
If the flush tank always lets thru a little bit of water, what is
the problem?
Siphon is cracked
what do you regenerate green sand manganese filter with
potassium permanganate
what is the minimum sump vent size?
2”
what prevents a wet stand pipe from freezing?
glycol and RP
what size is a fire hydrant’s vent taping?
1/8”
where is the take off for a sprinkler system?
between meter and main valve
what are the two product used to degreased an med pipe:
TSP
four people in a house, how many gallons consume?
4 x 60L = 240 gal
min. size for water supply to a urinal tank?
1/2”
min pipe size for med gas is
1/2” type K and L
what does the fill valve regulate?
flush cycle
what does a chemical feed filter need?
siphonage device
if pressure switch contact are closed and the power is there, why
is the pump not working?
Over load protector tripped
what is install on a centrifugal pump to prevent the water from
draining down?
check valve
prison toilet:
one piece stainless steel
what kind of toilet does a public washroom need
a siphon toilet with open seat
F.F.D.
funnel floor drain
U.T.R
up through roof
how does a Siamese fitting work?
fireman hooks up a hose to it to boost
the pressure for the sprinkler system
what can you add to lower the PH of water?
neutralizing filter
bridging on the brine tank:
break the salt down and lower the
feed
salty water after regeneration why?
too short a rinse cycle
what happens during a regeneration cycle in a water softener?
sodium are replacing calcium and magnesium
what kind of carrier does a vertical soil pipe for toilet need?
in line vertical carrier
is copper allowed on urinals?
no
what does a pressure balancing valve do
prevents scalding
FU (Fixture unit loads) Information
Bathroom group with flush tank 6
Bathroom group with direct flush 8
Bath tub 1.5
Bidet 1
Floor drain 2 with 2” Trap
3 with 3” Trap
Kitchen sink 1.5
Urinal pedestal 4
Stall 2
Washout 1.5
WC Flush tank 4
WC Direct flush 6
what must be carefully selected when five loops in your floor heating system?
Header size
Maximum Loop length for 3/8,1/2, 5/8, and 3/4”
3/8 250 ft
½ 300 ft
5/8 400 ft
¾ 500 ft
according to B214-01 what is the max floor temperature for in floor heating
system?
88 deg F
What can be used under R.P.H to stop heat loss under concrete floor?
R5 rigid insulation
hree way valve in a system mix how does it work?
Same as a 4 way valve with less flow back to the boiler, and will not protect against low return water temp.
Where wouldn’t you place pex in an infloor system?
Within 6” of the walls, food
storage, refrigerators, toilets
Heat Loss
SA x Delta T x U factor
Get formula for hemispehrical tank volume in metric and weight in KG
V=(pi x r2 x l or H) + 1.33 x pi x r2
Urinals info
3 Gallon tank has a maximum of 3 Urinals installed
5 Gallon tank has a maximum of 5 Urinals installed
Solenoid connected to either a timer or motion
sensor can be installed of the supply piping to help conserve water
Trouble shooting
If it will not flush check supply water
Running constantly check siphon tube for damage
Hot water NUmbers
- 120F to a fixture Maximum
- 140F Hot water tank Minimum
- 110F Recommended
- 104-107 F Typical bathing temperature
Legionnaires disease can be caused running tank temp below 140 F
drinking fountain rules for swimming pools
1 Drinking fountain is required at all public swimming pools
Drinking fountain shall be recessed and placed at the shallow end of
the pool.
Atmospheric Vacuum Breaker
-6” Above point of use
-Protects against minor or moderate hazards
-Protects against back siphonage only
Double Check Valve Assembly
-Protects against back siphonage and back pressure
-DCVA requires 36” clearance for testing
Dual Check Valve
-Minor hazards
-Residential applications
-Premise isolation
-Lawn irrigation
-Inlet side of water softener to ensure filter media doesn’t enter city water
supply.
-Control against back pressure and back siphonage
When you use an air test on a water distribution system, it requires a duration of ________ hours
at a pressure of ______ PSI
2 hrs / 100
