Definitions Flashcards
To become familiar with the vocabulary of Backflow
American National Standards Institute
ANSI
American Society of Sanitary Engineers
ASSE
Atmospheric Vacuum Breaker
AVB
Critical Level
CL
Double Check Valve Assembly
DC
Double Check Detector Assembly
DCDA
Pounds per Square Inch Absolute
PSIA
Pounds per Square Inch Differential
PSID
Pounds per Square Inch Gauge
PSIG
Pressure Vacuum Breaker
PVB
Reduced Pressure Principle Assembly
RP
Reduced Pressure Detector Assembly
RPDA
Safe Drinking Water Act
SDWA
Spill-resistant Vacuum Breaker
SVB
Test Cock
TC
The total pressure: gauge pressure plus atmospheric pressure
Absolute Pressure
The unobstructed vertical distance through the free atmosphere between the lowest drainage opening and the flood level rim of the receptor
Air Gap, Drainage
The unobstructed vertical distance through the free atmosphere between the lowest opening in the potable water supply and the flood level rim of any tank, vat or fixture
Air Gap, Water Supply
An opening in the body of a device or assembly, which will allow air into the liquid passageway to break a siphon
Air Inlet
Acceptable to the Authority Having Jurisdiction
Approved
Assembly that has been tested for conformity with recognized standards acceptable to the Authority Having Jurisdiction
Approved Assembly
An assembly of components, such as isolation valves,check valves,test cocks, and more that together constitute a backflow preventer that can be in-line testable.
Assembly
This is the pressure exerted by the earth’s atmosphere at sea level,which is 14.7PSI
Atmospheric Pressure
The undesirable reversal of flow in a potable system that is connected to a non potable system
Backflow
Backflow due to an increased pressure above supply pressure
Backpressure
Backflow due a negative (less than atmospheric) pressure in the supply
Backsiphonage
A vertical piping arrangement designed to prevent backsiphonage backflow. (35 feet above highest use )
Barometric Loop
Isolating The water consumer from the water main. Backflow preventer located at the meter.
Containment
An impairment of the quality of the potable water that creates an actual hazard to the public health.( High hazard)
Contaminant
Water pressure available for more than 12 hours in a 24 hour period.
Continuous Pressure
The minimum elevation above the flood level rim, ground or highest downstream use
Critical Level
Any connection or arrangement, physical or otherwise, between the potable supply and a non potable source .
Cross-connection
Derived from the evaluation of conditions within a water system, which can be classified as either a health hazard or non health hazard
Degree of hazard
A backflow preventer generally consisting of a single valve body,not capable of field testing with a gauge
Device
The relative difference in pressure between two points in the system.( upstream & downstream of a check)
Differential pressure
Backflow preventer consisting of two independently acting internally loaded check valves,,
Double check valve assembly
A device for backflow prevention consisting of two independently acting internally loaded check valves, no test cocks & no isolation valves.
Dual check
The minimum cross-sectional area at the point of water supply discharge to a fixture or tank. ( This applies to an air gap)
Effective opening
A continuous, enclosed interconnection to allow the flow of fluid from one system to the other.
Direct cross-connection
A potential cross-connection were the interconnection between the two systems is not permanent .
Indirect cross-connection
Backflow prevention protection provided at each fixture or system connection.
Isolation
A gauge pressure less than the existing atmospheric pressure when the latter is taken as a zero reference
Negative Pressure
A disease-producing organism or agent,such as virus, bacterium or other microorganism.
Pathogen
An impairment of the quality of the potable water to a degree that does not create a hazard to the public health but which does adversely affect the aesthetic quality of the water. ( looks bad,smells bad or tastes bad)
Pollution
Backflow preventer consisting of a loaded air inlet valve, an internally loaded check valve, two properly located test cocks and two isolation valves.
Pressure vacuum breaker assembly
Backflow preventer consisting of two independently acting internally loaded check valves,a differential pressure-relief valve, four properly located test cocks,and two isolation valves.
Reduced pressure principle assembly
The tendency of matter to change in volume in response to a change in temperature.
Thermal expansion
A poisonous substance that is produced by living cells or organism and is capable of causing disease when introduced into the body tissues.
Toxic
A hydraulic principle that states as a flow path is restricted , an incompressible fluid will exhibit a greater velocity and a reduced system pressure through the restriction.
Venturi
The pressure existing without any flow
Static pressure
