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backflow exam question
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backflow exam questionDouble Check Valve Assembly - ANS-A testable mechanical device consisting of two
independently operating, spring-loaded check valves, four test cocks, and two full port
shut off valves
the purpose of an ASSE 1018 trap primer is to - ANS-maintain a trap seal
a laboratory faucet vacuum breaker must contain - ANS-two independently acting check
valves
ASSE 1060 - ANS-outdoor enclosures standard, freeze protective enclosures must
provide protection to a remedies of -30 f
device - ANS-a backflow prevents generally consisting of a single valve body not
capable of being field tested using a differential gauge
to stop a siphonic actin within a potable water system, we must - ANS-admit air into the
system
waterborne diseases - ANS-typhoid, cholera and giardiasis
a double check detector assembly installed on a antifreeze loop area requires -
ANS-replacement
removal of the relief valve spring on a reduced pressure principle assembly will cause
the assembly to - ANS-become a approved double check valve assembly
when testing the first check valve in the direction of flow on a reduced pressure
assembly using a sight tube the tube must be a minimum of - ANS-138.75
continuing discharge for a reduced pressure principle assembly during a no flow
condition may be caused by - ANS-a debris fouling the number one check valve
negligence - ANS-not meeting ones responsibility and causing harm
residual pressure - ANS-the pressure available at a fixture or water outlet after
allowances are made for pressure
, natural or propane fires domestic water heatersbare protected from excess pressure by
the installation of a.. - ANS-thermal expansion tank
installation of backflow assemblies results in - ANS-decrease in system water pressure
according to the manufacturers instructions valve levers on a t&p relief valve should be
operated at least - ANS-every 12 months
the installation of backflow asswmblies result in - ANS-velocity spike
when installaing a thermal expanaion tank, you should always - ANS-match the tank air
pressure to the syatem water pressure
what assembly creates a closed water system - ANS-prz, double check valve assembly,
pressure reducing valve, dual check valve
relief valves according to manufacture instructions must be inspected - ANS-every three
months
temperture and pressure relief valves on domestic water equipment should be sized
based on - ANS-btu input, water volume
whats not allowed on a irrigation system - ANS-double check
how do you calculate pressure at the bottom of 60 ft - ANS-60÷.433
negative gauge pressure - ANS-high usuage
- ANS-
test cock sizes - ANS-1/4-3/4
a dual check - ANS-device
backsiphon will be what psi - ANS-0psi
negative pressure will result in - ANS-high usage
more velocity= - ANS-less pressure
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