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Texas Irrigator License Exam 2024: Backflow Prevention Devices, Exams of Nursing
An overview of the key concepts and devices related to backflow prevention, which is a crucial aspect of the texas irrigator license exam 2024. It covers topics such as air gaps, anti-siphon devices, atmospheric vacuum breakers (avbs), pressure vacuum breakers (pvbs), double check valve assemblies (dcvas), and reduced pressure principle devices (rps). The working principles, installation requirements, and applications of these backflow prevention devices, as well as the concepts of backpressure, backsiphonage, and the degree of hazard. This information is essential for individuals preparing for the texas irrigator license exam 2024, as it covers the fundamental knowledge required to understand and apply backflow prevention techniques in irrigation systems.
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Texas Irrigator License Exam 2024-
Backflow
Air Gap - Answer Gap through air between lowest point of water supply & flood level rim. i.e. Sink water level & faucet Anti-Siphon Device - Answer Any device that introduces air into the system to prevent back siphonage. AVB (Atmospheric Vacuum Breaker) or PVB (Pressure-type Vacuum Breaker) Atmospheric Vacuum Breaker (AVB) - Answer Blackflow device that allows air with use of a float. Shape: Like an L Back Pressure: No Constant Pressure: No more than 12 hrs in 24-hr period. Install Height: Vertically with min of 6" higher than all downstream piping and highest downstream head. Install: No shut-off valves downstream. Must be on discharge side of each control valve.
Backflow - Answer Unwanted reversal of water flow Backpressure - Answer Where pressure in the discharge (outlet or downstream) side is greater than pressure in the supply (inlet or upstream) side. i.e. Gravity from elevation, pump, steam/air pressure. Backsiphonage - Answer Backflow from negative pressure in the system. i.e Break in city main line or fire department using excessive amount of water. Types of Backflow Preventors - Answer Air Gap Atmospheric Vacuum Breaker (AVB) Pressure Vacuum Breaker (PVB) Double Check Valve Assembly (DCVA or DC) Reduced Pressure Principle Device (RP or RPZ) +Double Check Valve Assembly (DCVA) - Answer Backflow device that uses 2 shut-off valves and 2 check valves to prevent backflow. Degree of Hazard - Answer Measure of risk to public health. Substances that affect this include pollutants & contaminants. Pollutant - Answer Substance that may affect color or odor, but not create health hazard.
Contaminant - Answer Substance that may cause illness or death if ingested. Any system labeled as health hazard and that could contain contaminants must use a backflow prevention device and by tested annually. Pressure Vacuum Breaker (PVB) - Answer Backflow prevention device that uses a spring-loaded check valve and introduction of air to prevent back siphonage. Reduced Pressure Principle Device (RP or RPP or RPZ) - Answer Backflow prevention device that uses 2 independently acting check valves and an automatic operating pressure differential relief valve between the 2 check valves.
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