Cross Connection Practice Exam

What is the recommended premise isolation for a dockside facility with internal protection at the fixture?

1. Single Check Valve Assembly

2. Atmospheric Vacuum Breaker

3. Double Check Valve Assembly

4. Reduced Pressure Principle Assembly

The correct answer is: Double Check Valve Assembly

The recommended premise isolation for a dockside facility with internal protection at the fixture is a Double Check Valve Assembly. This type of assembly is specifically designed to prevent backflow in non-health hazard situations by providing two independently acting check valves. It is suitable for facilities like docks, where contamination risks can arise from various environmental factors, but the degree of hazard is not classified as high. Double Check Valve Assemblies are effective in protecting the potable water supply from potential contaminants that might be present within the facility or in the surrounding environment. Their installation provides a reliable means of premise isolation while allowing for low-pressure fluctuations and maintaining a straightforward method for testing and maintaining the equipment. Other options, such as Atmospheric Vacuum Breakers or Reduced Pressure Principle Assemblies, while effective in certain situations, do not offer the same level of protection suitable for the specific needs of a dockside facility with internal protection issues. Atmospheric Vacuum Breakers are designed primarily for preventing back-siphonage and are not suitable for continuous pressure applications, while Reduced Pressure Principle Assemblies are typically reserved for facilities with higher hazard levels and have a more complex installation and maintenance requirement. Therefore, the selection of a Double Check Valve Assembly aligns with the safety needs and operational standards of a dockside facility,