all right I'm gonna demonstrate some of the common faults they can throw at you
at the Department of Health crackle- practical exam for back full
assembly testers so I'm going to create some simulations and show you what
happens so I'm going to test my RP assembly so I'm going to notify identify
inspect and make sure it's an RP those RP on the tag has a vent on the bottom of
it direction of flow arrow telling me that's the direction of flow test cock
one test cock 2 it's got three test cock for shutoff valve number two shut off
out number one so I'm going to flush my test cocks open
up test cock number four leave it running
open up test cock number three leave it running
open up test cock number two leave it running
open up test cock number one close test cock number one close test cock number
two close test cock number three and close test
cock number four I'm going to take my high side hose connect it to test cock
number two take my low side hose connect it to test cock number three I'm going
to open up test cock number three and I'm going to open my low bleed valve on
the top of my gauge to bleed the air and to bleed my test kit from the low side
hose I'm going to slowly open up test cock number two drives the gauge upwards
but then I'm also gonna open up my high side bleed valve to bleed the air out of
my high side hose and out of the gauge with these both open I'm gonna close
shut off valve number two I'm gonna close my high bleed drive the
gauge up to the upper end close my low bleed observe oh wait a minute my relief
valve is discharging and my gauge is dropped below 5 which is the minimum
value for check valve number 1 so I have a failed check valve number 1 I could
tell the Proctor Proctor I have a failed check valve number 1 which case the
Proctor would say problem has been corrected and so in order to back up a
step all I would need to do is just open the low bleed valve to re-establish and
move on with the test by observing the apparent differential cross check valve
number 1 and so in this case my apparent differential cross check valve number 1
is 10 point 6 psi D so now I'm gonna check the relief valve opening point so
I'm gonna open up my high control valve approximately 1 turn and I'm gonna open
my low control valve no more than a quarter turn so I'm going to open it a
little bit or observe my gauge starting to go down
but I noticed that my gauge seems to be going down rather slowly and it kind of
stops so I'm gonna back up a little bit just make sure I haven't gone more than
a quarter turn I'm gonna open it up to approximately quarter turn my gauge
drops more but I can't get the relief out open so I'm thinking I've got a
leaking shutoff valve number two with flow downstream now I can verify that by
you know I can't get my relief out to dump I can verify that by closing my low
control valve and my gauge goes up again so if I open the little control valve
it'll go down I close it it goes up okay the only way my gauge can go up as if
there's flow across check valve number one and so I have it the only way you
can have flow going across check valve number one is if you've got a leaking
shutoff out of number two with flow downstream so I would tell the Proctor
Proctor I've got a leaking shutoff out number two with flow downstream in which
case the Proctor would say problems been corrected I would back up by opening up
my low bleed valve to reestablish my differential wait for it to go back down
to the apparent okay and this time my apparent is
well I don't have any simulations going on in my let's see make sure all my
hoses are tight make sure I got all my
make sure I got all my valves off
okay now I got a good apparent reading of 9.2 PSID so notice that when I had a
leaking shutoff out with flow downstream my apparent was actually higher than then
that it is this time so I've got an apparent differential reading of 9.2 psi
D so I'm going to check for the relief valve opening point so I'm gonna open my
high control valve approximately turn and I'm gonna open my low control valve
no more than a quarter turn my gauge is falling my gauge is falling two is the
minimum it's gone below two and it's actually gone to zero without opening
which indicates that my relief valve is stuck okay in this case if I close my
low control valve it doesn't go back up you know so when it gets to zero always
remember zero equals stuck so I would tell the Proctor Proctor I have a stuck
relief valve which case the Proctor would say problems been corrected I
would back up by opening up my low bleed valve to reestablish my differential
okay I would observe the apparent
9.2 PSID I would open the high control valve approximately a turn open my low
control valve no more than a quarter turn wait for the drip
okay fell to draw at 3.8 PSID so I'd say my relief valve opening point is 3.8
psi D okay I would then continue on by purging the air out of my vent hose by
opening my vent control valve close my back control valve put the vent hose on
test cock number four you know and you always want to make sure that you open
test cock number four right away don't forget to open it so you've got an open
test cock four re-establish your zone by opening up the low bleed okay
then you can open your vent control valve wait a minute when I open the vent
control valve that thing's dropping like a rock and my relief valve opens that
tells me that the number two check valve has failed so I'd say proctor number two
check valves failed proctor would say problems been corrected you would open
your low bleed valve again to re-establish your differential okay I
open up my vent control valve this time my gauge does not go down my relief valve
does not open in this case my check valve number two is held tight so I can
say check valve number two holds tight Proctor and Pete back to check valve
number two holds tight then to finish the test you would open the low bleed
valve again to reestablish the differential and wait for your gauge
to settle and this is the reading across check valve number one all right so the
reading across check valve number one is nine point two psi D now you can set
down the test hit you know always remember on the RP you've got to close
all the test valves before you or test cocks before you open up the shutoff
valve number two so I'm going to close all the test cocks I'm gonna slowly open
shutoff valve number two I'm gonna remove my hoses gotta tell the Proctor
that I've done testing the RP assembly hopefully Proctor says which assembly
would you like to test next in the real world you would also have to remember to
fill out your test report completely accurately allegedly so that concludes
this demonstration