BOMI Air Handling, Water Treatment & Plumbing Systems Practice Test

Back siphonage is caused by a drop in pressure relative to ambient. What condition can cause such a drop?

A sudden drop in system pressure A sudden rise in system pressure Stable, constant pressure Gradual warming of water

Correct Answer:

A sudden drop in system pressure

Explanation:

Back siphonage happens when the pressure in the water supply line falls below ambient pressure, creating suction that can pull non-potable water back into the potable system through a cross-connection. The condition that can cause this drop is a sudden decrease in system pressure. A sudden rise in pressure, stable pressure, or gradual warming of water do not create the negative pressure needed for back siphonage. This is precisely why backflow prevention devices are used—to prevent contaminants from being drawn back into the system when pressure dips occur.

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