BAT Backflow Assembly Tester Prevention Methods 3

Question 1

A double check detector assembly (DCDA) is typically installed on which type of service connection?

Accepted Answer

Fire sprinkler service lines

Answer

The double check detector assembly is specifically designed for fire sprinkler systems because it provides backflow protection while also detecting unauthorized water usage through a small bypass meter.

Question 2

Under AWWA and USC FCCCHR guidelines, which hazard classification requires an air gap rather than a mechanical backflow preventer?

Accepted Answer

Connections to premises containing substances lethal at low doses with no feasible testable assembly

Answer

An air gap is the only acceptable means of protection when the hazard involves substances lethal at very low concentrations (e.g., certain pesticides) and no mechanical assembly is deemed adequate by the administrative authority.

Question 3

What is the minimum required air gap distance above the flood level rim for a 1-inch diameter water supply inlet?

Accepted Answer

2 inches

Answer

ASME A112.1.2 specifies a minimum air gap of twice the inside diameter of the supply pipe, but no less than 1 inch; for a 1-inch pipe the required gap is 2 inches.

Question 4

A spill-resistant pressure vacuum breaker (SVB) differs from a standard PVB primarily because:

Accepted Answer

Its air-inlet valve is internally loaded and will not spill if pressure drops suddenly

Answer

The spill-resistant PVB (ASSE 1056) uses a specially designed, internally loaded air inlet that prevents nuisance spilling when pressure fluctuates, while still protecting against backsiphonage.

Question 5

During an RP assembly No. 2 check valve test, the gauge holds steady after needle valve closure. What does this result indicate?

Accepted Answer

Check valve #2 is holding tight and passes the test

Answer

A steady (non-dropping) gauge reading after closing the needle valve during the No. 2 check test indicates check valve #2 is holding tight and meets the pass criterion.

(BAT) Backflow Assembly Tester Certification Practice Test

(BAT) Backflow Assembly Tester Certification Practice Test

BAT Backflow Assembly Tester Prevention Methods 3