Module Two - Water Supplies Flashcards
Principles of a Municipal water System
Public and private water systems provide the method for supplying water to populated areas
Principles of a Municipal water System Contain the following:
Sources of water and storage
Means of moving the water
Water processing or treatment facility
Water distribution system
Direct pumping systems
Uses one or more pumps that takes water from the primary source and discharges it through the filtration and treatment processes
Gravity systems
Uses a primary water source located at a higher elevation than the distribution system
The City of Calgary water supply is made up of
47 pressure zones
- 7 direct pumping systems - 40 Gravity systems
Dead-end hydrant
Hydrant that receives water from only one direction
Circulating feed or looped line
Hydrant receives water from two or more directions
City of calgary uses what system
Grid System (primary feeders, secondary feeders, and distributors)
Primary feeders
Large pipes (mains) with relatively widespread spacing that conveys large quantity of water to various points in the system for local distribution to the smaller mains
Secondary feeders
Network of intermediate-sized pipes that reinforce the grid within the various loops of the primary feeder system and aid the concentration of the required fire flow at any point
Distributors
Grid arrangements of smaller mains serving individual fire hydrants and blocks of consumers (*image p.185)
Function of water valve
Provide a means for controlling the flow of water through the distribution piping
Indicating valves
Visually shows whether the gate or valve seat is open, closed or partially closed
o Post indicator valve
o Outside screw and yoke valve
Post indicator valve
Type of valve used to control underground water mains found on the supply main of installed fire protection systems
Outside screw and yoke valve
A type of control valve for a sprinkler system in which the position of the center screw indicates whether the valve is open or closed
