Water Distribution Grade 1 Certification Practice Exam

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What is the minimum separation distance for an "air-gap separation" according to Arizona State Rule?

1 inch only
0.5 inches
1 inch or twice the diameter of the supply pipe, whichever is greater
2 inches

The correct answer is: 1 inch or twice the diameter of the supply pipe, whichever is greater

The minimum separation distance for an "air-gap separation" according to Arizona State Rule is defined as 1 inch or twice the diameter of the supply pipe, whichever is greater. This requirement is grounded in public health and safety principles aimed at preventing cross-connections between potable water supplies and potential contaminants. An air gap is an essential safety feature in water distribution systems, ensuring that there is a physical distance between the water supply and any possible source of contamination, such as wastewater or non-potable water. By stipulating that the separation must be either a minimum of 1 inch or twice the diameter of the supply pipe, Arizona rules provide a flexible and safety-oriented approach. This allows for adaptation based on the specific installation and associated risks to ensure adequate protection against backflow. In contrast, other options that suggest fixed distances like 0.5 inches or 2 inches do not provide the same level of adaptability based on the size of the pipe. It is crucial for water distribution professionals to adhere to the established regulations to maintain the integrity of the water supply system and protect public health.