All right, now what I'd like to do is I'd like to demonstrate
the common faults that will occur on the Washington State
Certification Exam and also the common faults that you're going
to run into in the field when testing an RP assembly.
So I'm going to demonstrate those on the RP assembly.
So I'm going to notify, identify, and inspect the
assembly first. So I'm going to notify the
customer that I'm going to be testing and I'm going to turn it
off for a little bit of time. I'm going to identify the
assembly. It's, like, yep, this is an RP.
Here's my vent. It says RP on it.
Here's the serial number, all that fun stuff.
I'm going to inspect and see if anything's unusual about this
particular situation. Nope.
Everything looks good. So, now, I'm going to begin the
testing procedures. I'm going to make sure my -- all
my gauges, my needle valves are closed, and all that.
And, then, I'm going to flush the test cocks.
And remember you're going to flush the test cocks in a
particular order so that you do not get the relief valve to open
accidentally. You want to get it to do it when
you want to. And you do that by, first,
opening test cock number four, leave it running.
Then, I'm going to open up test cock number three.
I'm going to leave it running. Going to open up test cock
number two, leave it running. Going to open up test cock
number one, flush it out for a second.
And, then, I'm going to close test cock one, close test cock
two, close test cock three, close test cock four.
Now, I'm going to start hooking up my equipment.
So I'm going to take the high-side hose, hook it up to
test cock number two. I'm going to take the low-side
hose, hook it up to test cock number three.
All right, I'm going to open up test cock number three, and I'm
going to open my low-side bleed to purge air out of the hose and
out of the test kit. Nothing should happen with the
needle gauge. The gauge on the needle, or
however you want to say that. I'm going to open up test cock
number two. That should cause the gauge to
move. And, then, I'm going to, again,
I'm going to open up the high-side bleed on the top of
the gauge here and purge the hose and the high side of any
air, okay? Now, with both of these running,
I'm going to reach down and close shutoff valve number two.
All right, and, then, I'm going to close the high-side bleed.
And I'm going to close the low-side bleed and, oh, wait a
minute. Something's going on here, my
relief valve is discharging, okay?
Well, what this indicates is that check valve number one has
failed, all right? And in the real world, when
check valve number one fails, you cannot go any farther on the
exam or on testing this in the real world, the assembly.
But when you're taking the exam, you would say, Proctor or I have
a problem, I have a leaking check valve number one, in which
case the Proctor would go, okay, problem's been corrected.
So, now, I'm going to need to back up a step and re-test.
So, in that case, what I would do is I would re-establish the
differential by opening the low-bleed here, get the gauge to
the high end of the scale. Close my low-bleed, wait for the
gauge to settle down. And once it's settled, that is
my apparent reading on check-valve number one.
And so my apparent reading at this time is 10.2 psid.
So, next, what I'm going to do -- so once I have an apparent
reading, essentially what that is telling you is that, yes,
check-valve number one is working and, so, the zone is
doing what it's supposed to be doing, and you can move on to
the next step. However, we don't know for sure
if that's the true reading, and we'll figure that out in up a
moment, all right? So to test the relief valve
opening point, I'm going to take the high-side control value and
I'm going to open that up about a turn.
And, then, I'm going to take the low-side control valve, which is
this one, and I'm going to open it up no more than a quarter a
turn. And when I open that up, the
gauge should start going down. And I've got my hand under the
relief vent here, waiting for the first drip to come hit my
hand. All right.
So I'm slowly watching the gauge go down.
All right, I opened my gate. I opened my needle valve.
I keep opening up a little bit more, as you might see.
But I can't get the relief valve to open, all right?
Now, again, do not open the
low-control valve here more than a quarter turn ever, all right?
So I can't get the relief valve to open.
So, what I suspect is going on, because it didn't go to zero,
but I can't get it to open, what I suspect is going on is I
suspect that my shutoff valve number two is leaking.
Now, I can essentially prove that by, if I close my
low-control valve the needle goes back up, all right?
So if I close my low-control valve and the needle goes back
up, that indicates to me that there is flow going through this
assembly, all right, so that the pressure that's in the zone that
I'm trying to manipulate with my test gauge is being bled through
the assembly and past the check valve -- because my
check -- or, excuse me, the shutout valve, because my
shutoff valve isn't closed tight.
So, again, I can open this up -- so, if I open this up a quarter
turn, you know, I can get it to go faster, and I can get it to
go a little bit farther down. But, you know, I'm essentially
right above 2, which is the minimum value, but I can't get
the relief valve to open up. And, again, if I close it, gauge
goes back up. So I'd say, Proctor, I have a
leaking shutoff valve number two, in which case the Proctor
would say, all right. Problem's been corrected.
Go back a step. So to go -- well, they may not
say go back a step. So, then, I would reestablish my
zone here, okay? And, then, I would move on.
So, then, as I go to move on, I still haven't -- this is still
open a turn yet. I haven't done anything with
that. But, next, I'm going to take and
go back and I'm going to turn my low-control valve no more than a
quarter turn. My gauge is dropping.
And something else is going on. All right, my gauge is dropping.
It's gone below 2. That's a problem.
And my gauge is dropping, my gauge is dropping.
And, again, don't open it more than a quarter turn, because
that's a fail. But it eventually reaches zero.
Well, at this point, what that means is the pressure on this
side of the check valve is the same on the pressure of this
side of the check valve. And, obviously, the relief valve
didn't open. So the relief valve is stuck,
all right?
So whenever you're testing the relief valve, if it goes to
zero, zero equals stuck, okay? Now, the other thing I want to
double-check, if I close this, nothing happens, all right?
If I open it and close it again nothing happens, all right?
That's an indication that the relief valve is stuck, because
nothing is happening, all right? So I would say, Proctor, the
relief valve is stuck. And they would go, all right,
problem's been corrected. And I would reestablish the
differential and the zone by opening up the low-bleed valve
at the top of the kit, drive the gauge above the apparent
differential, which was 10 previously, okay?
And, then, now, I'm going to just test for the relief valve
opening point. And, again, throughout this
whole time, I've left my high-side control value open a
turn. So, now, I'm going to open this
a quarter turn. Or less -- a little bit, no more
than a quarter turn -- just, actually, I just
cracked it a little bit. And you can see my gauge is
going down slowly. And, then, the relief valve
started venting there at 4.2 psid.
So my relief valve opening point is 4.2 psid.
That's above the minimum of 2 psid.
Once I've got the relief valve opening point, I can, then,
close the low-control valve. I'm going to leave the
high-control valve open. But what I'm going to do next is
I'm going to purge the vent hose of any air.
So I'm going to open up the vent control knob here, purge the air
out of the hose. I'm going to put the hose on
test cock number four, which isn't always easy with one hand.
All right, once you put the hose on, do not forget, and before
you do anything else, open the test cock.
So I've opened the test cock. Now, I'm going to reestablish
the zone. So I'm going to open up the
low-side bleed valve until it's above the apparent reading.
So I'm above the apparent reading that I had of 10 psid,
okay? Wait for it to settle.
And, then, I'm going to open the vent control valve, and watch
what happens. So when I open the vent control
valve, I'm going to keep an eye on my gauge.
Oops, it's going down. I'm going to keep an eye on
things. And, eventually, the relief
valve opens. Now, the reality is here, one of
two things could be happening. It could be that the check valve
has failed. It could also be that we have a
really bad case of disc compression.
Well, according to the UFC Procedures, what you should do
at this point is you should open up the low-bleed valve and get
the gauge to go up above the differential, close the
low-bleed valve, and see what happens again.
And if the relief valve does vent again, like it does here,
then, that truly is the cause, truly is check valve number two
has failed. So at this point, after I have
double-checked whether the relief value is failing or
opening, and whether I've double-checked what the check
valve is failing, now, at this point would I say, Proctor,
check valve number two has failed.
Now, again, this is something that's a little bit different
than in past times. So let me demonstrate that
again. So I'm going to re-establish the
zone. All right, I'm going to create
my fault, okay? So, oops, let me close the vent
here. Let me back up a step, and,
actually, let me just -- I'm going to take this off.
But, also, I need to remember to close the test cock, or I get
myself wet. All right.
So, again, let's go through that again, just so that we're all
clear about this. All right, so I've got my relief
valve opening point. I've left my high-control valve
open approximately a turn. My low-control valve is off.
I'm going to purge my vent hose. I'm going to put my vent hose on
test cock number four. I'm going to immediately open
test cock number four, all right?
I'm going to open my low-bleed valve to establish the zone and
get above the apparent reading. I'm going to wait for it to
settle. I'm going to open my vent
control knob. My gauge drops.
The relief valve starts to vent. I need to make sure that I open
my bleed value again so that it goes above the apparent, close
it, watch what happens again. And the relief valve vents
again. So that truly means check valve
number one -- or, excuse me, check valve number two is
leaking and it's not disc compression.
So at this point, I would say check valve number two is
leaking. Proctor would say, problem's
been corrected. At which case, I would now
re-establish the zone. I have to do this again, where
I'm going to open the low-bleed valve and so that it drives it
up above the apparent reading or the far end of the gauge.
Close my low-bleed valve and wait to see what the value is
across check-valve number one. So I'm testing for the value
across check-valve number one. And, in this case, it's settling
down a little bit more. So, in this case, the value I
have for across check-valve number one is 9.6 psid.
Now, if you might remember, when I first tested this at the very
beginning of this video, the value was 10.2, which is what I
would expect, because when I first tested this, I had
simulated a leak through shutoff-value number two.
And when there's a little bit of flow going through the assembly,
the difference between the two zones is going to be a little
bit higher. And this is why we always call
it an apparent reading because it's not until we have tested
for a leak in shutoff valve number two that we really know
that this is the true value. So anyway, once I said check
valve number one holds tight at 9.6 psid, I'm going to close all
my controls. I am going to close all my test
cocks. And it is important that you
close all the test cocks before you re-establish flow through
the assembly. Once I've closed all the test
cocks, if I'm in a hurry to get the customer back in service, I
can now open up shutoff valve number two.
And I can now remove my equipment.
All right, and the other thing, I just always kind of make sure
that I've got these test cocks all the way off.
So my test cocks are all the way off.
So I've returned it to service. So, now, I'm going to let the
owner know that I'm done with the assembly.
I'm going to fill out the form completely, accurately, and
legibly. And, now, I'm done testing the
RP assembly. And, oh, the other thing is I'm
going to do -- there's another video on our website that gives
you a better example of disc compression.
So if you check out our website, there'll be a video on disc
compression. Thank you.