Water Distribution 060201c Flashcards
Where is the groundwater we find
In porous layers of rock,sand, gravel called aquifers
Who established acceptable levels of organic and inorganic matter in drinking water
Health Canada in conjunction with concerned individuals from various provinces
How often should water supplies be tested
Once a year
What’s the max velocity of water in a transmission pipe
Max of 5ft/sec
Maximum static pressure allowed in occupied building
80 psi (550 kpa)
When the pressure in a building exceeds 80 psi or 550kpa what should be installed
Pressure reducing Valve PRV
What’s used in pipes changes of direction to prevent pipes coming apart
Thrust blocks or thrust anchors
Minimum size of water service for single family dwelling
3/4”
Nicks or scratches deeper than what percent of wall thickness are required to be replaced
10%
Where does building distribution piping begin
Begins at the outlet of the water meter
A ball valve or inverted plug valve installed in the water service pipe at a customers property line
Curb cock ( CC)
What stops cannot be opened or closed from ground surface as they are covered over with back fill
Small corporation main stop
The threaded connection of the sadddle is located to point toward the property and with its outlet at an angle of what degree
30 to 45 degrees
Outlet pipe installed with a service bend is called what for 2” or less
Settlement loop or gooseneck
Some types Cold water supply pipes are only suitable for cold water what should they be protected from
Hot water flowing back from water heater
Device keeps temperature of water from exceeding 99c and must be installed top 6” of the tank
Pressure relief valve
Controls on-off function of the heating device and maintains water at a pre set temperature of about 60c fire domestic use
Thermostat
Pressure relief valve must have the outlet directed with a drop tube of same diameter within how many inches of the floor
12”
When an eco control trips
Control must be replaced means something in the tank is malfunctioning
Relief valve piping practices
If steel no threads on open end if copper cut at a 45 degree angle
Minimum static pressure at water service entry
Not less than 200 kpa 30 psi
Sizing a water distribution system what distances have to be kept in mind
Total developed length most remote fixture to property line not longer than 90 metres
After calculation the sum of fixture units needed for building what do you need to check
If there are any added demands from things such as a irrigation system or fire sprinkler system
The intention of water distribution systems
Have all systems function in a manner that will provide adequate pressure and flow to all fixtures under any circumstance
Piping from the hot water tank to a fixture less than ____ metres away will operate satisfactorily
30
All hot water distribution systems that are more than 30 metres in developed length must have what
Have a re circ system or self regulating heat trace
Shut off valve is required on supply line to every what fixture
Water closet
If anything could contaminate building water such as hot water boiler with chemicals or glycol products
A second backflow preventer must be installed
What can’t you bypass around
Backflow prevention
Who states that an air gap will not be permitted on a fixture that is situated in a noxious environment
National plumbing code of Canada
What percent of volume should an expansion tank be sized for a hot water heater
Should be sized to accommodate 5% of the tanks volume
Where must the drains from water treatment devices be piped
Must be indirectly connected to the drainage system to prevent contamination of the filter bed and water passing through the filter bed
These size valves for water service pipe can be stop and drain valves
3/4” 1”
What size do they install water metres to allow a passage for a suitable amount of water without causing pressure loss
5/8s water meter
Minimum size water service allowed to have a bypass arrangement around the meter
1 1/2” ( 38 mm)
Air testing water distribution system what pressure and how long
100 psi and hold for 2 hours
Water distribution systems can be found in what section of the national plumbing code of Canada
Section 2.6
