Journeyman Review Number Seven Flashcards
A heating/cooling tower has been sized to provide 24,000 BTUs on one floor and 12,000 BTUs on another how many tonnes of heating and cooling will the tower need to supply
3 tonnes
20 m of mild steel pipe installed at 17°C encounters a temperature rise of 50°C how much will the steel pipe expand?
12 millimetres
When testing petroleum fuelled oil piping, the supply return piping shall be tested
Together at the same pressure
A heating cooling system is found to have 32% glycol now requires 45% glycol. The volume of the system is 225 L approximately how much glycol needs to be added
40 L
Increase percentage of glycol times system volume - divided by percent of water
13 x 225- divided by 68% water = 40 liters
On a solar heating system, the PRV shall be located
at the system, Highpoint
A plumber has replaced the washers on a existing two handle faucet, the faucet still drips what is the next part to be replaced?
The faucet seat
Who provides the green triangle rating for steel toed boots?
CSA
What is required to control flow through a grease interceptor?
A flow control device on the inlet piping
The most common gases found in a confined space are
Carbon monoxide and H2S
What is the first thing to be done prior to entering a manhole?
Obtain a permit
What is the total feet ahead of a pump having 20 feet of suction head and 50 feet of discharge head
70 feet
What is the approximate discharge of a pump having 20 feet of suction head and 50psi discharge head?
115 feet
20 feet of suction head is not relevant in this question
Two boilers share a common supply and return what devices would be required for safe operation
Two low water, cutoffs, and one flow switch
A waterline enters a building having a geodetic elevation of 692 m with a pressure of 480 KPA what would be the pressure at 673 m
293 KPA
Which term is best used to describe a complete recirculation of swimming pool water
Rate of turnover
The circuit breaker tripped immediately after a pump starts what could be the possible cause?
A short circuit
Undersize wiring
Faulty circuit breaker
All of the above
All of the above
Which device is required on a domestic cold water system in a high-rise building with a booster pump
Check valve
When a water service pipe enters a building under the footing, what is the expected burial depth?
300 mm
A piping system has an offset of 13 inches in an advance of 22 inches what it will be the end to end measurement of the travel by using the following information
Fitting allowance is equal to 1 3/16 of an inch
Weld gap equals 1/8 inch
22- 15/16”
Water feed to a boiler has low pH what may be added to the water to raise the pH
Soda ash
What is the required “air gap” of a half inch domestic waterline
25 mm and two pipe diameters
On a domestic cold water system to the drain heat recovery coil, what type of flow would be best most efficient
Counterflow
What items can be found on a rural water systems tank T
Pressure switch, pressure, gauge, pressure, relief, valve, and drain
Which of the following DHW systems require recirculation
Develop length of 30 m and three stories
Develop length of not more than 30 m and four stories
Develop length of more than 30 m and more than four stories
Develop length not greater than 30 m and not more than 11 stories
Develop length of more than 30 m and more than four stories
Which of the following is used for medical gas connections?
Nitrogen purge with solder joints
Nitrogen purge with flux BAG joints
Bcup – three
BCUP -five
Bcup five
A manufactured piping system is to be operating at 1500 psi what type of material should be used in the installation
Seamless
How is an electric hot water tanks heating element tested for resistance and accountability
Tank drained of water, element removed and tested with ohm metre
What is the size of a P-trap for a three compartment sink?
One size larger than the largest fixture outlet pipe
What would be the cause of overheated concrete in a radiant floor system?
The flow is too slow
What is the correct pressure setting for a hydronic heating system?
12 to 15 psi
How would a pressure reducing valve be adjusted for a hydronic heating system?
Counterclockwise
(On top of the pRV to change pressure)
In a new rural water pump installation, what would be the cause of a pump cycling?
Undersized pressure tank
What is the critical limit of a pressure vacuum breaker?
300 mm above flood level rim of a fixture
What is the correct install procedure of a steel tub
Install a horizontal 2 x 4 for Support along with clips
What is the proper procedure for matching alloys when welding
Refer to specifications
What is the proper tool for tightening an MJ clamp?
A torque wrench
What should be done if the ball gets stuck during a ball test
Send a camera down the drainage pipe to confirm its location
Which of the following would be required when installing a drainage system for an elevator pit
A sump located inside the elevator pit
No back water valve required as there is no risk
A sump located outside the elevator pit
No drain required by code
A sump located outside the elevator pit
A manhole that is 1 m in depth when installed as per the NPC would require
An airtight seal and vent when installed within a building
Where would a cooling only fan coil be install installed?
The ceiling
What would cause bacteria to be present in a piping system that has a properly functioning UV sterilizing system?
Flow is too fast
What would be the correct procedure for a hydrostatic test on a geothermal system?
Fill the system with water, purge the air and pressurize
How many litres of glycol would require to achieve 35% glycol to water ratio when the system is 300 L
105 L
When using a compression hand bender to make a 90 bend with soft copper, where does the measured mark lineup on the tool?
In line with the 90 or L marking
When using a compression hand bender to make a 90 Ben with soft copper at what point is the Bend complete?
The 0 mark on the pull handle aligns with the 90 mark of the bending wheel
A circulator for a domestic water system requires what type of impeller
Bronze
What is the approximate timeframe of pump with a discharge rate of 1.62 US gallons per minute will take to empty a rectangular tank measuring 6’ x 3’ x 30”
3.5 hours
6x3x2.5 =45 ft cubed x 7.48usgal per ft3 =336.6 us gallons / by 1.62 = 207.77 minutes / 60 min a hour = 3.46 hours
The balancing valves for domestic in slab hydronic heating system should be located on the
Return manifold
As per ASME the minimum size of a boiler steam blow down drain (think, mud drum)
Shall not be less than
3/4Inch
What is the minimum size of a water service pipe with a developed length of 91 m and a velocity of 3.0 m/s
Inch and a half
When referring to pressure, one bar would equal to approximately how much psi
14.7
Of the following materials, which would be acceptable for use as a laboratory drainage system
Galvanized DWV
System 15
ABS
Glass pipe
Glass pipe
A mechanical contractor is hired to install 250 feet of 4 inch system 15 the system has 12 solvent well joints. How long will it take two plumbers to attach the fittings if each joint takes 20 minutes
2hours
