Tools & Equipment Operation Flashcards

A backflow tester uses a 2-valve (high/low) test kit versus a 5-valve test kit. The primary advantage of the 5-valve kit is:

Answer: It allows isolation of each hose independently for more complex testing procedures

A 5-valve kit's independent valves allow hoses to be isolated, connected, or vented without disturbing other test connections, enabling more precise procedural control.

When testing a pressure vacuum breaker (PVB), which tool is essential to verify that the air inlet valve opens at the required differential?

Answer: A differential pressure gauge connected above and below the check valve

A differential pressure gauge measures the pressure drop across the check valve, confirming the air inlet opens at 1.0 psid or greater as required.

A tester finds that after connecting test kit hoses, the gauge needle oscillates (bounces) continuously. The most likely cause is:

Answer: Partially open needle valves on the gauge allowing pulsating water pressure to affect the needle

Needle oscillation usually indicates that needle valves are not throttled enough to dampen system pressure fluctuations reaching the gauge.

ASSE 1012-compliant test kits are required to have an accuracy of at minimum:

Answer: ±2% of full scale or ±0.2 psid, whichever is greater

ASSE 1012 requires test kit gauges to be accurate within ±2% of full scale or ±0.2 psid (whichever is greater) to ensure reliable field results.

After completing a field test, the recommended method for storing rubber hoses on a test kit is to:

Answer: Coil them loosely without sharp bends and store away from heat and UV light

Loose coiling away from heat and UV prevents cracking, kinking, and premature degradation of rubber hose material.

A digital differential pressure gauge used for backflow testing must be checked against a known standard. The best reference tool for this calibration check in the field is:

Answer: A recently certified analog differential gauge or a dead-weight tester

A certified analog gauge or dead-weight tester provides a traceable reference against which the digital gauge's accuracy can be verified.

When using a shut-off tool (key wrench) to close a curb stop upstream of an assembly under test, the tester must ensure the tool is:

Answer: The correct size and type to engage the curb stop pentagon or square nut without slipping

An improperly fitted curb stop key can slip and damage the valve stem or fail to fully close, which compromises test conditions.