Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
IFSTA Chapter 12
Water Supply
| Question | Answer |
|---|---|
| What are the three methods of moving water within a system? | A-Gravity, direct pumping systems and combination |
| Where are most direct pumping systems found? | A-in agricultural and industrial settings. |
| Gravity pressure in a gravity system is adequate only when the primary water source is located how much higher than the highest point of the water system? | A-100 feet |
| What is a dead end hydrant? | A-a hydrant that receives water from only one direction. |
| Hydrants that receive water from more than one direction are said to have a? | A-circulating feed or looped line. |
| A distribution system that provides circulating feed from all directions is called what type of system? | A-a grid system. |
| Large mains with relatively widespread spacing that convey large quantities of water to various points in the system for distribution to secondary feeders and smaller mains. | A-primary feeders |
| Network of intermediate sized mains that subdivide the grid within the various loops of primary feeders and supply the distributors. | A-secondary feeders |
| Grid arrangement of smaller mains serving individual fire hydrants and blocks of consumers. | A-distributors |
| Fire hydrants should be supplied with what size mains in residential and business/industrial districts? | A-residential-6”, business-8” |
| Water supply valves are broadly divided into two types...they are? | A-indicating and non indicating |
| What are two commonly used indicator valves? | A-post indicator valve (PIV) and outside stem and yoke (os&y) |
| What are the two words that will be displayed on a PIV? | A-open and shut |
| Tight closing valves and they usually have a rubber or rubber-composition seat that is bonded to the valve body. The valve disk rotates 90 degrees from fully open to the tight shut position. | A-Butterfly valve |
| What is the term for force per unit.....force that moves water through a conduit either pipe or hose? | A-pressure |
| How is pressure measured? | A-PSI-pounds per square inch. |
| Stored potential energy that is available to force water through mains, valves, hydrants, and fire hose. | A-static pressure |
| The forward velocity pressure at a discharge opening while water is flowing. | A-flow pressure |
| The pressure left in the distribution system at a specific location when water is flowing. | A-residual pressure |
| In general all hydrant bonnets, barrels, and foot pieces are made of what? | A-cast iron |
| The internal working parts of a hydrant are typically made of what? | A-bronze |
| What are the steps to shutting down a dry barrel hydrant? | A-close the main valve and then a quarter turn back, cap all discharges except one, place palm over the open discharge.....will feel a slight vacuum if it is draining. |
| What are two additional names for wet barrel hydrants? | A-Frost free or california hydrants. |
| In high value districts what is the spacing of hydrants? | A-no more than 300 feet apart. A basic rule is every other intersection...additional hydrants may be required where distances between intersections exceed 350 to 400 feet. |
| In most cities, the repair and maintenance of fire hydrants are the responsibility of which agency? | A-the water department. |
| Flow tests are completed how often? | A-annually |
| The process of drawing water from a static source to supply a pumper is known as what? | A-drafting |
| How much space is needed above and below the hard intake strainer during drafting? | A-a minimum of 24” |
| Dry hydrants installed at static water sources are designed to supply a minimum of how many gpm? | A-1000 gpm |
| These involve hauling water from a supply source(fill sites) to portable tanks (dump sites) from which water may be drawn to fight a fire. | A-Water shuttles |
| In most cases, water shuttle operations are recommended for distances greater than? | A-1/2 mile |
Created by:
951bruin