Chapter 6, Field Testing Flashcards
Mechanical backflow prevention assemblies must be field tested at
Once a year, annually
Test gauges should have their accuracy verified at least
Once a year
This type of gauge can be used to test, reduce pressure, principal assemblies, double check, valve assemblies, pressure, vacuum, breakers, and spill resistant vacuum breakers
A differential pressure gauge
For a DCVA, differential pressure gauge measures pressure differentials between the ______ side and _____ side of a _____ valve
High, Low, check
True or false. The general design of the differential pressure gauge must include three pressure hoses and two, three, or five needle valves.
True
The gauge itself measures the difference in pressure between the____ and the______
Low pressure hose, high-pressure hose
These are used to remove air from the backflow preventer and the test gauge
Bleed valves
As soon as the test cocks are open, the gauge is:
Online
True or false water is always supplied to both sides of the gauge, no matter which test gage needle valves are open or closed
True
When the bleed valves are open water forces air out of
The bleed line
The control valves are used during the testing to control the ______ of water from the high-pressure hose to the low pressure hose
Bypass
When testing the pressure vacuum breaker assembly the differential pressure gauges used to ensure that the air inlet valve opens at:
1.0 psi or greater
For a pressure vacuum breaker, the single check valve in the pressure vacuum breaker assembly must hold tight against
1.0 psi in the direction of flow
When testing the double check valve, the differential pressure gauge is used to test the assembly to check that each check valve closes when water is moving through the check assembly. This is also called a:
Direction of flow test
When testing a reduced pressure assembly, the differential pressure gauge is used to verify that check valve number one will maintain a pressure differential of at least:
5.0 PSI
A site tube is used on a:
Double check valve assembly
Once the site tube is attached to the TC it is filled with water to a minimum height of
28 inches
The disadvantage of the site tube is that it cannot be used if there is not enough
Adequate space (at least 28 inches)
Test results from the site to only indicate:
Pass or fail
When testing with a tube, the tester must wait
Two minutes for the water to stabilize
Double check valve assemblies must hold drip tight against:
1.0 psi in the direction of flow
Any problems with the assembly due to vandalism or whether also should be noted on the form in a
Comments or remark section
Evidence of _____ include wet spots, tall grass, moss, or algae growth, erosion, or puddled water around the assembly
Leaks
Prior to any backflow preventer testing, the customer should be
Notified
