testing and troubleshooting Flashcards
on a RPBA the relief valve opening point is _____ below supply pressure
a minimum of 2 psi
on a RPBA to pass, the pressure loss across the first check is
a minimum 5 psi
on a RPBA the buffer must be
a minimum of 3 psi
on a RPBA the pressure loss across check #2 must be
a minimum of 1 psi
on a RPBA ca you exchange the springs between checks #1 and #2?
no
to calculate the buffer on a RPBA you….
subtract the opening point from #1 pressure loss
if an RPBA discharges in a no flow situation and stops discharging in a flow condition, the most likely cause is
fouled check #1
when testing a DCVA, both shut are closed, #1 check passes, you open test cock #4 and water continuously runs, what is the cause?
2 shut off leaks with back pressure
a RPBA has athe relief valve discharging when #1 shut off valve is open, the cause is?
1 check fouled
when testing a DCVA test cocks 2 3 4 are are open but test cock 4 continues to flow, what is the probable cause
?
leaking shut off #2 with back pressure
when testing a PVB what must be done after the air inlet point has been recorded
drain the water from the body
the cause of a RPBA relief valve opening with no flow and flow conditions
fouled #1 check
differential test gauge pressure range is
0 - 15 psi
whern testing a RPBA why is it important to avoid premature opening of the relief valve
false reading may occur
what could the tester do if shutoff valve #1 is leaking slightly during test #1 on a DCVA to complete the test
compensate with a bleed valve arrangement
on a DCVA can you procede with the tests if #1 shut off is leaking slightly
yes if tested with a bleed valve arrangement
backflow testing is required at what interval
annually or when repaired
the probable cause of a intermittent discharge on a RPBA is
fluctuating supply pressurew
hen flushing test cocks on a RPBA which test cock is opened first
TC 4
the spring on the relief valve in a RPBA is installed to
assist the opening of the relief valve
on a RPBA, nuisance spitting can be caused from
fluctuating supply pressureon a differe
ntial pressure gauge the marked increments are
1/5 of a psig
what is the first test on a RPBA
relief valve opening point
when testing a DCVA and #1 check leaks you may?
test #2 check before repair on #1 check
the minimum requirements that the air inlet on a PVB must open is at
at or above 1 psi
on a large diameter DVCA. #3 test cock is below the assembly body, what is need to test the assembly
attach extension tube to the test cock #3
when field testing a PVB the gauge should be
placed at the correct level
in a RPBA the pressure loss of #1 check and #2 check is ?
different values
when you are testing a DCVA with a differential gauge
the gauge must be at the correct level, and unused hoses should be properly located
what is the minimum buffer required on a RPBA
3 psid
when testing an DCDA what must be recorded
all pressure losses
on the first test of a PVB where do you attach the high side hose
2 test cock
on a PVB the spring in the air inlet is to
assist the air inlet to openw
hen must the canopy from a PVB be removed
before test #1
on the second test on a PVB where do you attach the low side hose?
you do not use the low side hose
what can be done to prevent nuisance spitting on a RPBA
install a soft seated check upstream
