Backflow Prevention & Cross-Connection Control Flashcards

How frequently must testable backflow prevention assemblies be inspected and tested in most U.S. jurisdictions?

Answer: At least annually by a certified backflow tester

Most jurisdictions require testable backflow prevention assemblies to be inspected and tested at least once per year by a certified backflow prevention assembly tester.

What distinguishes a reduced pressure zone (RPZ) assembly from a double check valve assembly (DCVA)?

Answer: The RPZ includes a differential pressure relief valve between its two check valves

The RPZ assembly includes a differential pressure relief valve in the zone between the two check valves that opens and discharges to atmosphere if either check valve fails or leaks.

A double check valve assembly (DCVA) is approved for which hazard classification?

Answer: Low-to-moderate hazard cross-connections

DCVAs are approved for low-to-moderate hazard cross-connections (such as irrigation without chemical injection or fire sprinklers without additives) but are not suitable for high-hazard applications.

Which location is NOT acceptable for installing a pressure vacuum breaker (PVB)?

Answer: In a below-grade pit or vault

PVBs cannot be installed below grade or in pits because the vent port opens to atmosphere when activated and could be submerged in water, negating its protective function.

What is the primary purpose of a hose bib vacuum breaker installed on an outdoor faucet?

Answer: To prevent contaminated water from backsiphoning through a connected garden hose

Hose bib vacuum breakers prevent backsiphonage through garden hoses, which can be submerged in pools, chemical buckets, or other contaminated sources.

Under most U.S. plumbing codes, who is authorized to perform the required testing of backflow prevention assemblies?

Answer: A certified backflow prevention assembly tester holding an approved certification

Testing must be performed by a specially certified backflow prevention assembly tester who has completed an approved training course and passed a certification examination.

What is a spill-resistant pressure vacuum breaker (SVB) specifically designed to prevent?

Answer: Nuisance water spillage from the vent port during normal pressure fluctuations

The SVB incorporates a poppet check valve at the vent port to prevent water from spilling during minor pressure fluctuations while still providing full backsiphonage protection.