Chapter 1, introduction, the backflow prevention Flashcards
_____ is the reversal of the normal flow of a liquid or gas.
Backflow
______ is a link between a potable water system and a non-potable system
Cross connection
________ is a link between the potable water supply and any other non-potable system design to remain in place
Permanent cross connection
This physical link between the potable system and the non-potable source provides a pathway that allows movement in _______
Either direction
Water that is contaminated by any liquid, gas, or solid that can be diluted, dissolved, suspended, or mixed with water that adversely affects the quality of the water
Non-potable water
A substance is a __________ if it can adversely affect human health and safety
High hazard
High hazards are also referred to as what?
Health hazards
______ do not affect public health.
Low Hazards
The introduction of any substance into water at levels that degrades the quality of the water, making it unfit for human consumption because it would adversely affect public health
Contamination
A substance that deteriorates the aesthetic quality of water or other materials, but is not harmful to health. These are considered non-health or low hazards.
Pollutant
What are the two types of backflow?
Back pressure and Backsiphonage
This occurs when the customers pressure exceeds the supply pressure provided by the municipality
Back pressure
This can occur through a rise in the non-potable pressure, a drop in the potable pressure or a combination of both
BackPressure
This can also be caused by booster pumps or temperature increases in a boiler
BackPressure
This occurs when the supply line pressure falls below atmospheric pressure
Back siphonage
Back siphonage can also be caused by what?
Heavy water usage
Examples of heavy water usage include waterline, flushing, firefighting, and ______
Line breaks
This occurs when the supply line pressure falls below atmospheric pressure
Back siphonage
What is atmospheric pressure at sea level?
14.7 PSI
It is estimated that approximately ________ cross connections are created every day of the year in this country
100,000
_______ is a link between the portable water supply and any other non-potable system created with removable sections, swivel or changeover devices, garden hoses, and other non-permanent methods
Temporary cross-connection
This is a link between the potable water supply and any other non-potable system that is subject to both back pressure and back siphonage
A direct cross connection
This is a temporary link between the potable water supply and any other non-potable system that is subject to back siphonage only
indirect cross connection
The safe drinking water act (SDWA) was established in:
1974
