Cross Connection Certification Exam (with complete answers)

Absolute pressure correct answers The total pressure. The gauge pressure plus the atmospheric pressure at a given altitude. Air gap correct answers The unobstructed vertical distance through the free atmosphere between the lowest opening from any pipe or outlet supplying water to a tank, plumbing fixture, or other device, and the flood-level rim of the non-pressurized receiving vessel or receptacle. Approved correct answers Accepted by the Responsible Authority. Meets applicable specifications and standards. Atmospheric pressure correct answers The pressure exerted by the weight of the atmosphere. As the elevation above sea level increases, the atmosphere pressure decreases. Atmospheric vacuum breaker (AVB) correct answers A mechanical backflow prevention device consisting of a float check valve and an air inlet port designed to prevent backsiphonage by allowing air to enter the downstream water line. The unit does not provide protection against backpressure or continuous pressure. A shut-off valve is not allowed downstream from the device. Backflow correct answers The reversed flow of a non-potable source into a potable system because a pressure differential exists where the pressure on the non-potable side is greater than the pressure on the potable side. Backflow prevention assembly correct answers The entire backflow unit, icluding not only the mechanism that actually prevents backflow, but also the shut-off valves and test cocks. An assembly has a resilient seated, full-flow shut-off valve before and after the backflow preventer. Backflow prevention device correct answers Refers to the backflow prevention mechanism only. It does not include the shut-off valves located on the inlet and outlet. Backflow prevention method correct answers A mechanism for preventing backflow that includes mechanical backflow prevention assemblies, devices, and air gaps. Backpressure correct answers Occurs when the non-potable system's pressure exceeds the supply pressure Backsiphonage correct answers Occurs when the supply line pressure falls below atmospheric pressure causing a partial vacuum in the potable water distribution system Barometric loop correct answers a 34 foot vertical loop of piping that prevents backsiphonage only based on pressure principles