A Little More of Everything! Flashcards
Bell and spigot cast iron is installed with which part upstream?
Bell upstream.
When a well pump turns on as soon as a faucet is used the most likely problem is?
Water logged pressure tank.
A gear pump is a positive displacement pump and must be installed with a?
Pressure relief valve downstream.
How would you increase the length of a flush on a flushometer?
Turn regulating screw counter clockwise.
Which backflow preventer is not a testable device?
DCAP.
A well with a water tight casing requires minimum distance from a septic system of?
30 m.
When determining the location to install a condensing boiler what must be considered?
If there is a floor drain near it.
The discharge piping from a service water heater’s temperature and pressure relief valve must discharge within _____ of a floor drain or suitable area.
300 mm.
A four wire zone valve is wired to?
Thermostat, transformer, end switches.
A twin tank water softener will house the brine in one tank and the other tank will house the?
Zeolite.
Water that has a dissolved mineral content of > 181 mg/t would be deemed?
Very hard.
A private water supplied cistern is fitted with a 3/4” makeup water pipe supplied by a municipal system. What size air gap would be required?
1 1/2”
Which manufacturing method produces the strongest pipe?
Extruded.
What is it called when you pour concrete in stages?
Lifts.
If you had to remove a toilet and then put it down again after you have raised the floor what would you use?
Wax horn or flange extension kit.
Valves used on domestic hot water supply tanks and heaters include?
Pressure, temperature and vacuum relief valve.
In order to bend hard copper you must?
Heat the copper and then cool, then bend it.
When gluing small diameter PVC pipe (< 2”), can it be done without the use of primer?
Yes.
Which chemical is approved for disinfecting surface water used as a potable supply?
Sodium hypochlorite.
How do you secure a gas cylinder?
Secured upright with a cap.
What is the definition of “blackwater”?
Sewage that contains waste from toilets only.
How do you calculate the minimum radius for a bend of schedule 40 2” pipe?
6 x the diameter of the pipe. 12” in this case.
Will a 120 line pump voltage or a 240 line pump voltage be the most energy efficient?
240 line voltage.
How do you figure out which size pipe wrench to use on a piece of pipe?
Take the diameter of the pipe and times it by 12. Ex: 1 1/2” pipe x 12 = 18” pipe wrench.
If an electric hot water tank experiences a backsiphonage condition, what will happen?
Top element will burn out.
A T&P valve on a natural gas fired hot water tank starts dripping whenever the burner fires. What is the possible problem?
Expansion tank is waterlogged.
How efficient is an immersion element electric hot water tank?
100%.
What adjustment would be required for an electronic flush valve if it is being activated by people walking 6 feet away from it?
Adjust the length of the infrared sensor.
What does the small hole located on the dip tube of a hot water tank prevent?
Siphonage of water from the tank.
How do you allow for the grade on a branch when installing four wall hung water closets?
Adjust the height of each face plate.
What is the purpose of the threaded nipple on a chair carrier for a commercial wall-hung water closet?
To allow for different wall thickness and finishes.
What type of toilet is usually used for a wall outlet toilet?
Blowout.
How high is the overflow rim height of a barrier free toilet? A regular toilet?
16” and 15”.
A residential wall-hung toilet would most likely be what type of bowl?
Siphon jet or reverse trap with jet.
What is used to connect a wall-hung water closet tank to the bowl?
A “flush elbow”.
Backsiphonage from a flush valve-operated water closet can be prevented by installation of a _______ between the flush valve and the toilet bowl.
Vacuum breaker.
What is another name for a two-piece toilet?
Close coupled.
A compression stop is categorized as a?
Globe valve.
What is thread pitch?
The number of threads per inch.
The thread angle on a American Standard Pipe Thread is?
60 degrees.
What are the number of threads per inch for 1/2” and 3/4” pipe?
14.
What are the number of threads per inch for 1”, 1 1/4”, 1 1/2” and 2” pipe?
11 1/2.
What are the number of threads per inch for 2 1/2” pipe and greater?
8.
Why is it possible to cut threads on pipes of different diameters with the same die chasers?
They have the same number or threads per inch. Ex: 1/4” and 3/8” nominal pipe size have 18 threads per inch.
What is thread engagement?
The amount of pipe thread necessary to make a tight connection between pipe and fitting.
What is the thread engagement (inches) when 1/2” pipe is tight in a fitting?
1/2”.
What is the thread engagement (inches) when 1”, 1 1/4” and 1 1/2” pipe is tight in a fitting?
11/16”.
What is the thread engagement (inches) when 3/4” pipe is tight in a fitting?
9/16”.
What are pipe taps used for?
Cut or restore internal pipe threads.
Piping and tubing are described by their nominal pipe sizes (NPS). What are nominal pipe sizes?
Approximate inside diameters, measure in inches.
What standard or rating system directly relates pipe dimensions to pressure ratings?
Standard Dimension Ratio (SDR).
What is Standard Dimension Ratio (SDR)?
The ratio of the average outside diameter to the minimum wall thickness measure in inches. SDR=(outside diameter)/(minimum wall thickness)
Theoretically, different sizes of piping made of the same material, with the same SDR, should have the same pressure ratings. True or False?
True.
What are the color codes for ACR and Type GP tubing?
ACR - blue Type GP - yellow
Pressure reducing valves are installed in domestic applications to reduce incoming water to?
50 to 60 psi (344 to 413 kPa).
What two valves must be installed on the discharge side of a sewage pump?
Check valve followed by a gate valve if the pipe cannot be easily drained.
If there are water leaks around your faucet handles, with the water turned on or off, the problem could be ?
A loose packing nut, worn packing, worn O-ring or a damaged stem.
Most leak problems on port faucets are due to?
Faulty O-rings or plugging mechanisms, such as the disk, cartridge or ball.
If a bathtub or sink spout is dripping when the water is turned off, what needs to be repaired?
Washer or Seat.
What type of control is used with a water fountain?
Self-closing stop valve.
What do thermostatic control valves on shower heads or bathtubs spouts do?
Measure temperature and control mixing of hot and cold water.
Thermostatic control valves have a safety feature that shuts off water supply when?
The cold water drops too low.
What are the standard temperature and pressure relief valve settings on a domestic hot water tank?
Temperature relief at 99oC (210oF)
Pressure relief at 150 psi (1050 kPa)
What type of materical is being burned in a Class A fire?
Ordinary combustibles such as wood, paper, textiles, rubber and plastics.
What type of material is being burned in a Class D fires?
Fires involving combustible metals such as titanium, magnesium, aluminum, and potassium.
What type of material is being burned in a Class C fire?
Fires involving energized electrical equipement.
What type of material is being burned in a Class B fire?
Flammable or combustible vapours including gasoline and oils.
What type of fire extinguisher is best to use on Class D fires?
Use dry chemical extinguishers to put out the fire and can also use water to cool down large fires.
What type of fire extinguisher is best to use on Class C fires?
First disconnect the power supply and then use either a carbon dioxide (CO2) or
dry chemical extinguisher.
What type of fire extinguisher is best to use on Class B fires?
Carbon dioxide (CO2) extinguishers starve the fire of oxygen which can also be accomplished by using a set blanket or sand.
Dry chemical extinguishers.
What type of fire extinguisher is best to use on Class A fires?
Water. Cools the fire down to below its ignition temperature and prevents re-ignition from resideual heat or glowing embers.
What two classes of fires should you NOT use water to extinguish?
Class B and Class C fires.
What is the best general fire extinguisher currently on the market?
Triplex dry chemical.
To decrease the pressure supplied by a PRV, turn the regulating screw?
Counter clockwise.
What is back-siphonage caused by?
Negative pressure or a reduced pressure in the supply piping.
How does back pressure cause backflow to occur?
When the potable supply piping is connected to a system or fixture which exceeds the operating pressure of the potable supply piping.
When is a vent stack required?
Only required when a soil-or-waste stack has branches with fixtures draining into the soil-or-waste stack from five or more stories.
Double check vavle assemblys (DCVA) are used to protect the potable water system from what type of hazards? What type of backflow does it prevent against?
Substances which are not hazardous to health.
Both back pressure and back-siphonage.
Reduced pressure principle backflow prevention devices (RPBD) are used to protect the potable water system from what type of hazards? What type of backflow does it prevent against?
Extreme hazards which may be injurious to health.
Both back pressure and back-siphonage.
What are the principal cause of back-siphonage (4)?
- Undersized piping
- Water main repair or a break in the city or municipal water supply that is lower than a service point
- Lowered water main pressure due to high water withdrawal rate, such as fire fighting or water main flushing
- Reduced supply pressure on the suction side of a booster pump
What are the main causes of back pressure (4)?
- Booster pumps
- Potable water connections to boilers and other pressure systems
- Interconnections with another system which operates at a higher pressure
- Elevated piping, 9m or 30 feet above finished grade
Where is the base of a vent stack connected?
Always connected at or below the lowest horizontal branch on a soil-or-waste stack.
