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130 Cards in this Set
- Front
- Back
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The quantity of drinking water per day required by humans is approximately: |
2 litres |
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Cloud formation in the atmosphere is caused by: |
Cool air condensation of water vapour |
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Ground water that naturally reappears on the earths surface may show up as: |
Swamps, sloughs or springs. |
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Water vapour discharged from plant leaves is a by-product of: |
Photosynthesis |
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Undesirable by-products that can be released by combustion of hydrocarbons are: |
Compounds of nitrogen and sulphur. |
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The pH level of natural precipitation is commonly close to: |
5.6 |
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A pH level of 4 indicates that a substance is: |
Acidic |
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Water is considered to be a universal solvent because: |
More things dissolve in water than any other solvent. |
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The arterial loop distribution system used by municipalities is installed in areas with: |
Heavy demand on the system. |
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The tree system of water distribution makes it difficult to: |
Supply good water to all parts of the system. |
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Changes of direction or elevation in water distribution networks are protected from disconnection of fittings by: |
Thrust blocks and anchors. |
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If transmission pipes are rapidly drained without admitting air to the system: |
The pipe may collapse from effects of vacuum. |
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A gooseneck on a water service is installed to provide for: |
Flexibility of the pipe as ground settles after backfill or moves from frost. |
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The corporation curb cock is placed on or near the property line so: |
The utility employee does not have to trespass on private property. |
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Drilling the corporation curb cock for a water service is: |
Discouraged by the AWWA. |
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If a water service is to be placed in the same trench as the building sewer, the trench: |
Should be excavated with a raised portion on one side of the water service pipe. |
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If a check valve or back flow preventer is installed to protect a water service pipe that is suitable for cold water only, the building water distribution system becomes a: |
Closed water system. |
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The shut off valve placed at the entry point of a 3/4” or 1” water service is allowed to be: |
A stop and drain valve. |
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A water test for a water distribution system may be done with: |
Potable water only. |
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What is the maximum length of connector used with a 3/8” supply pipe? |
750mm. |
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What is the minimum size of water distribution piping to a service water heater serving more than 2 fixtures? |
3/4”. |
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What is AWWA? |
American Water Works Association. |
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Where does the building distribution system begin? |
At the outlet of the water meter. |
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What is a corporation? |
A fitting or valve made of bronze or red brass. |
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What style does corporation fittings/valves come in? |
Flare or compression. |
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Where is corporation fittings/valves suited for? |
For use on underground water service piping. |
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What is a curb cock? |
A ball valve or inverted plug valve installed in the water service pipe at the customers property line to allow the service to be shut off for repair or non-payment of utility fees. |
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What is the largest size curb cock available? |
2” (50mm) |
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What is a main stop? |
A valve installed on a municipal water main to permit joining of the water service pipe. |
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What is the common name for the inlet thread connections on a main stop? |
A mueller thread. |
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What are the styles of outlet connections a main stop could have? |
Flared, iron pipe thread, flanged, or compression outlet connections. |
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What’s the largest size a main stop inlet thread can be? |
2” (50mm). |
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How do you close a main stop in a small service? |
You must excavate to expose them, as they are covered with backfill. |
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How do you close a large service main stop? |
Typically use a gate or glove valve as a service shut off connected to the distribution main with a tapping tee or split tee. |
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What is a curb cock chair? |
The support frame placed under the curb cock to support the curb cock and its extension. |
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Why do we use a curb cock chair? |
This prevents deflection of the service pipe as the curb cock is operated. |
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What is the curb cock extension? |
A sleeve placed over the corporation curb cock, plugged at its upper end, to allow access from the ground level to the curb cock. |
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What is the curb cock extension commonly referred to? |
A valve box, buffalo box or bury box extension. |
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What is a gooseneck or settlement loop? |
An S shaped bend placed in the water service connection at the municipal main, to provide flexibility for the water service connection. |
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What service lines do not need a gooseneck or settlement loop? |
Service lines over 2” (50mm) and are tapped directly into the side of the distribution pipe. |
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What is potable water? |
Water that is suitable for human consumption. |
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What is polluted water? |
Water that contains objectionable matter that will NOT injure the health of humans drinking the water. |
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What is contaminated water? |
Water that contains matter that is capable of serious affecting the health people drinking the water. |
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In cold climates, where must the shut off valve be installed for the water service line? |
Inside the building. |
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What is the maximum water pressure in transmission and distribution pipes at peak demand period? |
80-100psi (550-690 kPa) |
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What is the maximum static pressure at the fixture? |
550kPa (80psi). |
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What is the minimum flow pressure at a fixture? |
Should not be less than manufacturers specifications. |
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When pipe changes elevation, what is installed at high points and what is installed at low points? |
High points- air and vacuum relief valves. Low points- drain valves. |
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What can be used instead of drain valves? |
Fire hydrants. |
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What is a thrust block? |
Poured concrete reinforcements placed at branches, fittings, and changes of direction or elevation. |
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What is the maximum distance from the from the property line to the farthest fixture for the simplified method? |
90 meters. |
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What does piping need when places under rivers or in areas of high water level? |
The pipe needs weights to prevent the pipe from floating to the surface. |
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Aside from thrust blocks, what else can be used to support underground pipe? |
Mechanical joint restraints. (Shackle rods) |
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What are above ground reservoirs usually made with? |
Steel plate. |
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What are underground reservoirs usually made of? |
Reinforced concrete. |
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What is the minimum size water service for a single family dwelling? |
3/4” (20mm) |
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What is the minimum static pressure at the service entry of the building for the simplified method? |
200 kPa |
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What is the water service pipe? |
The pipe that supplies water to an individual property. |
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When would you use a service saddle? |
When the pipe is relatively soft or thin. |
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Where should you locate the threaded connection of the saddle? |
Pointing towards the property at an angle of approximately 30 to 45 degrees. |
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A 3/4” water service pipe entering through a foundation wall should be installed through what size sleeve? |
3” (80mm) sleeve. |
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What should be used to seal the space between the sleeve and the water service pipe? |
A flexible, water resistant sealing compound. |
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What is best practice for spacing between the water service pipe and the wall? |
A 1” (25 mm) space between the pipe and wall is best practice. |
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What type of copper must be used for water service? |
Type K or L. |
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What is the normal depth of water service lines to prevent freezing? |
2 meters (6ft) |
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As the pipe enters the building, what should you install if the static pressure at the fixture is higher than 550 kPa (80psi)? |
A pressure reducing valve. |
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What should be installed downstream from a PRV, to protect the valve from sudden pressure variations? |
Water hammer arrestor or shock stops. |
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What should be installed in a water service line to protect from contamination? |
Backflow prevention device. |
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If a backflow preventor is installed, what does the distribution system become? |
A closed system. |
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What is an operating control normally set to on a hot water tank for storage? |
140 F (60C) |
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The expansion tank should be sized to accommodate what percentage of the storage tanks volume? |
5%. |
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What kind of valve can the 3/4” or 1” water serve contain for the building main shut off? |
Stop and drain valve. |
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What must the minimum pipe size be for the pipe feeding the service water heater if it’s serving more than 2 fixtures? |
3/4” |
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By code, where must a residential building have shut off valves? |
At every water closet At the cold inlet of the hot water tank. |
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What is the minimum size of water service that is permitted to have a bypass arrangement around the meter? |
1 1/2” (38mm) |
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What is the requirements for an air test on a water distribution system? |
700kPa (100psi) for 2 hours. |
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In a hot water distribution system of more than 30 m or 4 storeys, the water temp shall be maintained by: |
Recirculation or a self-regulating heat tracing system. |
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Pipes that pass through an exterior wall to supply water to the exterior of the building shall be provided with: |
A frost-proof hydrant or a stop-and-waste cock located inside the building. |
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In residential, what is the maximum water usage per flush cycle? |
4.8 Lpf. |
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When will they allow 6.0 Lpf in residential retrofits? |
When it would be impracticable given the existing building or municipal infrastructure. |
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Where must the temperature relief valve be installed on a storage type service water heater and at what temp must it discharge water? |
150mm above the tank. 99C |
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What must be installed when a tank can be subject to back-siphonage? |
A vacuum relief valve. |
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Storage type water heaters that are located in a ceiling or roof space or over wood floors, shall be installed with? |
A corrosion resistant watertight drain pan. |
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What are the parameters of a drain pan? |
Be not less than 50mm larger than the tank Be no less than 25mm high Be drained by a pipe 2 NPS larger than the relief valve Have a drain located directly below the relief valve. |
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In a hot water distribution system of more than 30 m or 4 storeys, the water temp shall be maintained by: |
Recirculation or a self-regulating heat tracing system. |
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What must be installed in a tank type water tank to prevent backflow? |
An anti siphon ball cock |
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Pipes that pass through an exterior wall to supply water to the exterior of the building shall be provided with: |
A frost-proof hydrant or a stop-and-waste cock located inside the building. |
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In residential, what is the maximum water usage per flush cycle? |
4.8 Lpf. |
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When will they allow 6.0 Lpf in residential retrofits? |
When it would be impracticable given the existing building or municipal infrastructure. |
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Where must the temperature relief valve be installed on a storage type service water heater and at what temp must it discharge water? |
150mm above the tank. 99C |
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What must be installed when a tank can be subject to back-siphonage? |
A vacuum relief valve. |
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Storage type water heaters that are located in a ceiling or roof space or over wood floors, shall be installed with? |
A corrosion resistant watertight drain pan. |
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What are the parameters of a drain pan? |
Be not less than 50mm larger than the tank Be no less than 25mm high Be drained by a pipe 2 NPS larger than the relief valve Have a drain located directly below the relief valve. |
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What needs to be installed on the return line to then hot water heater to prevent backflow? |
A check valve |
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What is installed to prevent backflow on a hose Bibb? |
A hose end vacuum breaker |
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What is the minimum size of air gap? |
2 spout diameters or 1 inch. |
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What’s the minimum distance for an air break? |
One pipe diameter or 1 inch. |
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What is the maximum operating temperature of polyethylene? |
130F (54c). |
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What is the maximum lead content in solder used in copper water distribution lines? |
0.02% |
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When running pipe horizontally along a wall, how should you orientate the lines? |
Hot on top, cold on bottom. |
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A meter bypass must be installed if the meter is: |
Larger than 1 1/4” |
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What is the smallest size of service pipe allowed? |
3/4. |
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What is the requirement for size when serving more than one fixture with the water heater? |
3/4. |
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What are the 3 requirements for using the simplified method of water sizing? |
-separate water services. - the total developed length of this water system measured from the furthest fixture to the property line is not more than 90m. - the minimum static pressure at the water service entry, usually the building isolation valve is not less than 200kpa. |
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The information needed for sizing water distribution system is: |
Pressure at the building isolation, distance from the main to the farthest faucet. |
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The pressure at the curb cock will not be the actual pressure used for sizing because: |
The minimum pressure at the building isolation must be at least 200kpa. |
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When sizing the water service you will size it according to: |
Total cold fixture units. |
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Residential instantaneous water heaters are designed for? |
Low flow rates. |
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In a gas-fired hot water tank, the largest volume of hot water is located: |
At the top, due to density factor. |
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When running pipe horizontally along a wall, how should you orientate the lines? What is |
Hot on top, cold on bottom. |
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Hot water tanks are usually rated for a maximum working pressure of: |
150psi. |
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The electric hot water tank: |
Has an anode rod since it may be exposed to corrosive water. |
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How are hot water tanks sized? |
Number of building occupants. |
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What is the lowest opening in a hot water tank for? |
Drain valve. |
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The hot water tank dip tube is: |
For directing the cold water down to the bottom of the tank. |
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What is the maximum temperature in a hot water tank is: |
210F (99c) |
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The temp and pressure relief valve must drop down to within what distance of the floor? |
12” (300mm) |
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An energy cut off can be used instead of? |
A temperature relief valve. |
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A vacuum breaker on a bottom feed hot water tank: |
Replaces the small hole drilled in the dip tube. |
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An indirect service hot water tank is usually heated by: |
Hot water. |
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What is the reason for having a recirculation line on the hot water? |
To supply hot water to the furthest fixtures immediately. |
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Thermostat controls for electric storage type service water heaters shall be set to a temp of: |
60 C |
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If you were to rough in a bank of water closets, could you have one shut off valve to serve the bank? |
No, one valve is required per water closet. |
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Ballcock valves come in all shapes and sizes. What’s the most important fact about them? |
They must be anti-siphon type. |
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What methods are used to drain the water in the distribution lines in an untested building? |
Slope the lines to a drain or blow out the lines. |
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The only time you can inter connect public and private water system is? |
It cannot ever be done. |
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What is the maximum pressure at the fixture in a water distribution system? |
550 kpag |
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When is a pressure reducing valve is needed? |
When the pressure exceeds 550 kpag |
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The higher the pressure in a water distribution system: |
The noisier the flow. |
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Air gaps shall not be located in what type of environment? |
A noxious one. |
