Unit 5 - Water Distribution Flashcards
Smaller branch lines in a distribution system are referred to as the _________ portion
Distribution
To compensate for distribution system pressure loss, these are installed at critical points of elevation
Booster systems
Service lines are sized based on the anticipated maximum demands of:
A - The fire department
B - The largest industrial users
C - Neighbouring communities
D - The end user
D - The end user
Where does the corporation stop control water flow from
The main water line
True or false: asbestos cement pipe is still used in water distribution?
False.
When a steel pipe meets a valve or other fitting, what is it jointed by?
A flange
What type of pipe is predominantly used in new distribution lines?
Polyvinyl Chloride (PVC)
Fire hydrant nozzle configuration is uniform for what reason?
To allow compatibility with firefighting equipment
The primary purpose of a fire hydrant is:
A - To fight fires
B - To provide operators access to to distribution systems
C - To flush Mains
D - All of the above
A - To fight fires
Flushing is especially important where:
At dead ends in distribution
What is the most common type of valve in the distribution system?
Gate Valves
True or False
Corporation stops control flow from the main line to the residential line
True
A corp stop is designed to be operated during:
A - curb cock installs
B - water meter installs
C - residential service commencement
D - emergency residential repairs
A - Curb cock installs
Which valve is installed by the customer at the point where the residential service line enters the house?
Stop and waste valve
True or False:
A summer valve-testing program is classified as Corrective Maintenance
False:
It is Preventative Maintenance
Removing standing water from hydrants is known as ____________
Purging
What’s the intended use of a hydrant flag
Hydrant location (for snow plows and emergency personnel
During hydrant flushing, an operator should flush until what point?
Until water appears clear
True or False
Chamber checking requires confined space entry policies be followed
True
A blueprint with a scale of 1:500 that every one centimetre is equal to _______ at the site
500 centimetres
You are handed a map without a North symbol. How can you determine South on the map
South should be at the bottom of the drawing
On a typical distribution system blueprint a curb cock is represented by what symbol and/or letters
An X and or the letters CC
This type of main failure is usually attributed to improper bedding
Straight break
Unchecked corrosion can result in which type of main failure?
Blow out
Water hammer:
A - is caused by gradual changes in pressure
B - can be caused by pump failures
C - may cause minor localized pipe damage
D - can result in a “straight break” type of main failure
B - can be cause by pump failures
True or false: A main break must be excavated 0.5m on either side of the break if replacement is required
True
True or False
Service line failures have a severe effect on the distribution system
False - Service line failures affect one customer
What is the usual way to indicate an inoperable fire hydrant
Colour-coded discs
