BAT Installation Techniques 3

Question 1

When installing a pressure vacuum breaker (PVB) for an irrigation system, the assembly must be installed at least how far above the highest downstream sprinkler head?

Accepted Answer

6 inches

Answer

PVBs must be installed a minimum of 6 inches above the highest downstream outlet to ensure the air inlet opens under back-siphonage conditions.

Question 2

Which condition makes installation of a PVB (pressure vacuum breaker) inappropriate for an irrigation system?

Accepted Answer

The downstream piping can be subjected to backpressure

Answer

PVBs are not designed to withstand backpressure; only back-siphonage protection is provided, so any system capable of creating downstream pressure requires an RP assembly.

Question 3

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

Accepted Answer

Does not discharge water from the air inlet during normal pressure fluctuations

Answer

The SVB contains a sealed check that prevents nuisance water spillage from the air inlet during normal pressure cycles while still opening under true vacuum conditions.

Question 4

When making a threaded connection to a backflow preventer body, the installer should apply thread sealant:

Accepted Answer

To the male threads only, keeping it away from the first two threads

Answer

Sealant is applied to male threads only and kept back from the first thread to prevent sealant from entering the waterway and potentially damaging internal components.

Question 5

An installer is connecting copper tubing to a bronze-bodied backflow preventer using a dielectric union. The purpose of this fitting is to:

Accepted Answer

Prevent galvanic corrosion between dissimilar metals

Answer

Dielectric unions isolate dissimilar metals electrically to prevent galvanic corrosion that occurs when two different metals are in direct contact in the presence of water.

(BAT) Backflow Assembly Tester Certification Practice Test

(BAT) Backflow Assembly Tester Certification Practice Test

BAT Installation Techniques 3