What is used to prevent contamination of a potable water system supplying a plumbing fixture such as a galley sink from a backup of sewage sanitary drains?
• Potable water protection requirements to keep drinking water safe from contamination • The difference between backflow prevention and drainage traps • How air gaps work in preventing sewage or dirty water from entering clean water lines
• Which part of the system could physically allow dirty water to flow back into the clean water supply – the supply side or the drain side? • What arrangement or device makes it impossible for wastewater to be siphoned or pushed back into the potable water piping? • Think about where the faucet or spigot is placed in relation to the highest possible water level in the sink. How does that affect the risk of backflow?
• Identify which choices deal with the supply line versus the drain line • Ask: which option creates a physical separation (not just a mechanical valve) between potable water and possible contamination? • Remember that a P-trap is designed for sewer gas control, not primarily for potable water protection
No comments yet
Be the first to share your thoughts!