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72 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Absolute Pressure |
Pressure measured on a scale where a perfect vacuum is zero. Absolute is the sum of gauge pressure and atmospheric pressure. |
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Accessible |
Capable of being reached for testing and maintenance, when referring to a backlog prevention assembly. However, it first may require the removal of an access panel, door or similar obstruction. |
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Administrative Authority |
The individual official, board, department, or agency established and authorized by a state, country, city or other political entity created by law to administer and enforce the provisions of the Cross-Connection Control program. |
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Air Gap |
A physical separation between the free-flowing discharge end of a portable water supply pipeline and an open or non-pressure receiving vessel. An "approved air gap" shall be at least twice the diameter of the supply pipe measured vertically above the overflow rim of the receiving vessel; in no case less than 1 inch. |
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Approved Back flow Prevention Assembly |
An assembly that has been investigated and approved by the administrative Authority having jurisdiction. The approval of backflow prevention assemblies by the administrative Authority shall be on the basis of a favorable laboratory and field evaluation report by an approved testing laboratory recommending such approval. |
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Approved Check Valve |
A check valve that is drips drip-tight in the normal direction of flow when the inlet pressure is at least 1.0 psi and the outlet pressure is zero. The check valve shall permit no leakage in a direction reverse to the normal flow. The closure element (e.g. Clapper, poppet) shall be internally loaded to promote rapid and positive closure. (I.e. pressure vacuum breaker {PVB & SVB}, double check valve assembly {DC} or reduced pressure principle assembly {RP}. |
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Approved Testing Laboratory |
The foundation for Cross-Connection Control and hydraulic research of the University of Southern California or other laboratory having equivalent capabilities for both the laboratory and field evaluation of backflow prevention assemblies. |
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Approved Water Supply |
Any public potable water supply, which has been investigated and approved by the health agency having jurisdiction. The system must be operating under a valid health permit. In determining what constitutes an approved Water Supply, the health agency has final judgment as to its safety and potability. |
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Aspirator |
A device used for creating suction, specifically by flowing water through a venturi or restricted area of flow. At this restricted area of flow the pressure drops to sub-atmospheric, thus suction is created. Usually a tube is attached at this location for aspiration or suction purposes. |
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Aspirator Effect |
The effect created by an aspirator, restricted area of flow or undersized piping. |
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Atmospheric Pressure |
The pressure (or weight per unit area) exerted bt the atmosphere on a surface. At sea level the atmospheric pressure is 14.7 psia. (pounds per square inch, absolute). |
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Atmospheric Vacuum Breaker Backsiphonage Prevention Assembly (AVB) |
An assembly containing an air inlet valve, a check seat and an inlet port (s). (Also known as the non-pressure type vacuum breaker.) The flow of water into the body causes the air inlet valve to close the air inlet port(s). When the flow of water stops the air inlet valve falls and forms a check valve against Backsiphonage. At the same time it opens the air inlet port (s) allowing air to enter and satisfy there shall be no shutoff valves or obstructions downstream. The assembly shall not be subjected to spheric vacuum breaker is designed to protect against a non-health hazard (i.e. pollutant) or a health hazard (i.e. contaminant) under a backsiphonage condition only. |
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Auxiliary Water Supply |
Any water supply on or available to the premises other than the water purveyors approved public potable water supply. These auxiliary waters may include water from another purveyors public potable water supply or any natural source such as a well, spring, river, stream, harbor, etc. They may be polluted or contaminated or they may be objectionable and constitute an unacceptable water source over which the water purveyor does have sanitary control. |
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Backflow |
The undesirable reversal of flow of water or mixtures of water and other liquids, gases or other substances into the distribution pipes of the potable supply of water from any source or sources. |
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Backflow Prevention Assembly |
Any effective assembly used to prevent backflow into a potable water system. The type of assembly used shall be based on the existing or potential degree of hazard and backflow condition. The types of backflow prevention assemblies are: -Atmospheric Vacuum Breaker Backsiphonage Prevention Assembly -Double Check Valve Backflow Prevention Assembly -Double Check Detector Backflow Prevention Assembly -Double Check Detector Backflow Prevention Assembly-Type I I - Pressure Vacuum Breaker Backsiphonage Prevention Assembly -Reduced Pressure Principle Backflow Prevention Assembly -Reduced Pressure Principle Detector Backflow Prevention Assembly -Reduced Pressure Principle Detector Backflow Prevention Assembly-Type I I - Spill-Resistant Pressure Vacuum Breaker Backsiphonage Prevention Assembly |
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Backpressure |
Any elevation of pressure in the downstream piping system (by pump, elevation of piping, steam pressure, air pressure, ect.) above the supply pressure at the point of consideration, which would cause or tend to cause a reversal of the normal direction of flow. |
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Backsiphonage |
A form of backflow due to a reduction in system pressure, which causes a sub-atmospheric pressure to exist in the water system. |
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Certified Backflow Prevention Assembly Tester |
A person who has proven ability in field testing backflow prevention assemblies to the satisfaction of the administrative authority having jurisdiction, either directly or through a third party certification program. Each person who is certified to perform field tests and prepare reports on backflow prevention assemblies shall be conversant in applicable laws, rules and regulations and have had experience in plumbing or pipe fitting or have other equivalent qualifications in the opinion of the administrative authority having jurisdiction. |
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Column of Water |
A vertical tube of water usually used to create a specific pressure or used to measure pressure by the elevation of the water in the tube. (A column of water 27 3/4 inches (2.31 feet) high generates a pressure of one pound per square inch.) |
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Consumer |
The owner of operator of an on-site water system(s) having a service from a public potable water system. |
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Consumer's Potable Water System |
The portion of the privately owned potable water system lying between the point of delivery and the point of use. This system includes all pipes, conduits, tanks, receptacles, fixtures, equipment and appurtenances used to produce, convey, store or utilize the potable water. |
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Consumer's Water System(s) |
Any water system located on the consumer's premises whether supplied by a public potable water system or an auxiliary water supply. The system of systems may be either a potable water system or an industrial piping system. |
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Containment |
Service connection |
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Contaminant |
Any substance that shall impair the quality of water, in such a way as to create an actual hazard to the public health through poisoning, the spread of disease, etc. |
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Critical Level |
The minimum elevation above the flood level rim of the fixture or receptacle served, downstream piping and water uses on atmospheric vacuum breakers, pressure vacuum breakers and spill-resistant vacuum breakers, at which the unit may be installed. This is indicated by the marking "C-L" or "C/L." When an AVB, PVB or SVB does not bear a critical level marking, the bottom of the assembly shall constitute the critical level. |
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Critical Service |
A water service that can never be interrupted due to the critical nature of facility involved. |
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Cross-Connection |
Any actual or potential connection or structural arrangement between a public or consumer's potable water system and any other source of system through which it is possible to introduce into any part of the potable system any used water, industrial fluid, gas, or substance other than the intended potable water with which the system is supplied. Bypass arrangements, jumper connections, removable sections, swivel or change-over devices and other temporary or permanent devices through which or because of which backflow can occur are considered to be cross-connections. -A direct cross-connection is a cross-connection which is subject to both backsiphonage and backpressure. -An indirect cross-connection is a cross-connection which is subject to backsiphonage only. |
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Degree of Hazard |
Either a pollutant (non-health hazard) or contaminant (health hazard); derived from the assessment of the materials, which may come in contact with the distribution system through a cross-connection. |
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Double Check Valve Backflow Prevention Assembly (DC) |
An assembly composed of two independently acting, approved check valves, including tightly closing resilient seated shutoff valves attached at each end of the assembly and fitted with properly located resilient seated test cocks. This assembly shall only be used to protect against a non-health hazard (i.e. pollutant) |
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Double Check Detector Backflow Prevention Assembly (DCDA) |
A specially designed assembly composed of a line-size approved double check valve assembly with a bypass containing a specific water meter and an approved double check valve assembly. The meter shall register accurately for rates of flow up to 2 gpm and shall show a registration for all rates of flow. This assembly shall only be used to protect against a non-health hazard (i.e. pollutant). The DCDA is primarily used on fire sprinkler systems. |
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Double Check Detector Backflow Prevention Assembly-Type II (DCDA-II) |
A specially designed assembly composed of a line-sized approved double check valve assembly with a bypass around the second check containing a specific water meter and a check valve. The meter shall register accurately for rates of flow up to 2 gpm and shall show a registration for all rates of flow. This assembly shall only be used to protect against a non-health hazard (i.e. pollutant). The DCDA-II is primarily used on fire sprinkler systems. |
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Gage Pressure |
The pressure above atmospheric pressure. |
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Grey Water |
Wastewater other than toilet contaminated waste. Wastewater generated by kitchen sinks and dishwashers are not considered grey water. |
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Health Hazard |
Contaminant |
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Health Agency |
The health authority having jurisdiction. |
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Hospital |
Any institution place, building, or agency which maintains and operates facilities for one or more persons for the diagnosis, care and treatment of human illness, including convalescence and care during and after pregnancy or which maintains and operates organized facilities for any such purpose, and to which persons may be admitted for overnight stay or longer. The term hospital includes sanitarium, nursing home and maternity home. |
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Industrial Fluids |
Any fluid or solution, which may be chemically, biologically or otherwise contaminated or polluted in a form or concentration , which would constitute a hazard if introduced into an approved water supply. |
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Industrial Piping System |
Any system used for transmission of or to confine or store any fluid, solid or gaseous substance other than an approved water supply. Such a system would include all pipes, conduits, tanks, receptacles, fixtures, equipment and appurtenances used to produce, convey or store substances which are or may be polluted or contaminated. |
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Internal Protection |
The appropriate type or method of backflow prevention within the consumer's potable water system at the point of use, commensurate with the degree of hazard. |
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Isolation |
Internal protection |
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Manifold Assembly |
An assembly comprised of backflow prevention assemblies (DC or RP) of the same manufacturer, model and size. Manifold adaptor fittings on both the inlet and outlet of the manifold assembly are considered integral components. The size of the manifold assembly is determined by the inlet and outlet connections of the manifold adaptor fittings. |
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Negative Pressure |
Any pressure below atmospheric pressure. |
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Non-health Hazard |
Pollution |
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Parallel Installation |
Two or more backflow prevention assemblies of the same type installed in parallel, that is having a common inlet, outlet and direction of flow. |
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Plumbing Hazard |
An internal or plumbing type cross-connection in a consumer's potable water system with either a pollutant or contaminant. |
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Point of Delivery |
Service connection |
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Pollution |
An impairment of the quality of the water to a degree which does not create a hazard to the public health but which does adversely and unreasonable affect the aesthetic qualities of such waters for domestic use. |
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Potable Water |
Water from any source which has been investigated by the health agency having jurisdiction, and which has been approved for human consumption. |
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Pressure |
A uniform force applied over a surface, measured as a force per unit area. Typically water pressure is measured in pounds per square inch or PSI. |
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Pressure Fluctuation |
The changes of pressure within a system. |
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Pressure Gradient |
A description of the direction and rate of change of pressure over time. |
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Pressure Vacuum Breaker Backsiphonage Prevention Assembly (PVB) |
An assembly containing an independently operating internally loaded check valve and an independently operating loaded air inlet valve located on the discharge side of the check valve. The assembly is to be equipped with properly located resilient seated test cocks and tightly closing resilient seated shutoff valves attached at each end of the assembly. This assembly is designed to protect against a non-health hazard (i.e. pollutant) or a health hazard (i.e. contaminant) under a backsiphonage condition only. |
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Public Potable Water System |
Any publicly or privately owned water system operated as a public utility under a valid health permit to supply water for domestic purposes. This system will include all sources, facilities and appurtenances between the source and the point of delivery such as valves, pumps, pipes, conduits, tanks, receptacles, fixtures, equipment and appurtenances used to produce, convey, treat or store potable water for public consumption or sue. |
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Readily Accessible |
Capable of being reached for testing and/or maintenance, without the need of removing any access panel, door, or similar obstruction. |
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Reclaimed Water |
Water which, as a result of treatment of wastewater, is suitable for a direct beneficial use or a controlled use that would not otherwise occur. Reclaimed water is not safe for human consumption. |
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Recycled Water |
Treated reclaimed water |
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Reduced Pressure Principle Backflow Prevention Assembly (RP) |
An assembly containing two independently acting approved check valves together with a hydraulically operating, mechanically independent pressure differential relief valve located between the check valves and at the same time below the first check valve. The unit shall include properly located resilient seated test cocks and tightly closing resilient seated shutoff valves at each end of the assembly. This assembly is designed to protect against a non-health hazard (i.e. pollutant) or a health hazard (i.e. contaminant). This assembly shall not be used for backflow protection of sewage or reclaimed water. |
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Reduced Pressure Principle Detector Backflow Prevention Assembly (RPDA) |
A specially designed assembly composed of a line-size approved reduced pressure principle backflow prevention assembly with a specific bypass containing a specific water meter and an approved reduced pressure principle backflow prevention assembly. The meter shall register accurately for rates of flow up to 2 gpm and shall show a registration for all rates of flow. This assembly shall be used to protect against a non-health hazard (i.e. pollutant) or a health hazard (i.e. contaminant). The RPDA is primarily used on fire sprinkler systems. |
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Reduced Pressure Principle Detector Backflow Prevention Assembly-Type II (RPDA-II) |
A specially designed assembly composed of a line-size approved reduced pressure principle backflow prevention assembly with a specific bypass around the second check valve containing a specific water meter and an approved check valve. The meter shall register accurately for rates of flow up to 2 gpm and shall show registration for all rates of flow. This assembly shall be used to protect against a non-health hazard (i.e. pollutant) or a health hazard (i.e. contaminant) The RPDA-II is primarily used on fire sprinkler systems. |
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Reused Water |
Untreated reclaimed water |
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Sanitary Sewer |
The pipe that carries sewage. |
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Service Connection |
The terminal end of a service connection from the public potable water system, (i.e. where the water supplier may lose jurisdiction and sanitary control of the water at its point of delivery to the consumer's water system). If a water meter is installed at the end of the service connection, then the service connection shall mean the downstream end of the water meter. |
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Service Protection |
The appropriate type or method of backflow protection at the service connection, commensurate with the degree of hazard of the consumer's potable water system. |
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Spill-Resistant Pressure Vacuum Breaker Backsiphonage Prevention Assembly (SVB) |
An assembly containing an independently operating internally loaded check valve and independently operating loaded air inlet valve located on the discharge side of the check valve. The assembly is to be equipped with a properly located resilient seated test cock, a properly located bleed/vent port, and tightly closing resilient seated shutoff valves attached at each end of the assembly. This assembly is designed to protect against a non-health hazard (i.e. pollutant) or a health hazard (i.e. contaminant) under a backsiphonage condition only. |
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Static Pressure |
The water pressure in any system under non-flowing conditions. |
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System Hazard |
An actual or potential threat of severe danger to the physical properties of the public or the consumer's potable water system or of a pollution or contamination, which would have a protracted effect on the quality of the potable water in the system. |
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Thermal Expansion |
The resulting effect when water in a closed system, such as a piping system downstream of a backflow preventer heats up. In effect, the heat causes the water volume to expand, but since the system is closed, the pressure increases. |
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Used Water |
Any water supplied by a water purveyor from a public potable water system to a consumer's water system after it has passed through the service connection and is no longer under the control of the water purveyor. |
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Venturi |
A piping apparatus with a constricted region designed to increase the velocity and thus decrease the pressure of an incompressible fluid in the constricted region. |
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Venturi Effect |
When an incompressible fluid's velocity increases as a result of flowing through a constricted area of piping, the pressure will decrease. |
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Water Supervisor |
The consumer or a person on the premises appointed by the consumer charged with the responsibility of maintaining the consumers' water system(s) on the property free from unprotected cross-connections and other sanitary defects, as required by regulations and laws. |
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Water Supplier |
The public or private owner or operator of the potable water system supplying an approved water supply to the public. |
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