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Utility Navigation

Predive Safety Check

2016
Jun 15

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Transcript Content

 

Predive Safety Check

00:00:05.000 --> 00:00:07.000
[underwater exhalation]

00:00:09.000 --> 00:00:14.000
Hi! My name is Bill Gordon. I'm one of the
instructors at the NOAA Diving Center in
Seattle, Washington.

00:00:14.000 --> 00:00:18.000
What we are about to go over is NOAA's version
of a predive safety check.

00:00:18.000 --> 00:00:23.000
This is our opportunity to catch about 95% of
diving problems before they get in the water.

00:00:23.000 --> 00:00:27.000
We try to catch those in the predive safety
check. So, let's go ahead and start!

00:00:29.000 --> 00:00:35.000
As you approach the diver, approach from the
back: check to make sure that the cam band is
woven properly and that it is nice and tight.

00:00:35.000 --> 00:00:38.000
It should be perpendicular to the long axis of the
cylinder.

00:00:38.000 --> 00:00:40.000
Then travel up...

00:00:40.000 --> 00:00:44.000
Make sure the air is all the way on, a quarter
turn off.

00:00:44.000 --> 00:00:50.000
While we are here we are going to go ahead and
check all the hoses: make sure they are more
than hand tight.

00:00:50.000 --> 00:00:57.000
Then we are going to go ahead and check where
the corrugated hose attaches to the BC. Make
sure that's tight.

00:00:57.000 --> 00:01:00.000
This is a remote dump. Make sure that that is
tight.

00:01:00.000 --> 00:01:05.000
And then most BCs will have a remote dump
somewhere by the diver's hip.

00:01:05.000 --> 00:01:11.000
In this case, the BC has it down by the diver's
right hip. So, we'll go ahead and check that.

00:01:11.000 --> 00:01:13.000
And we are going to go ahead and check hose
routing.

00:01:13.000 --> 00:01:19.000
So, the primary second stage - the one the diver
breathes from - should travel over the diver's right
shoulder.

00:01:19.000 --> 00:01:27.000
The low pressure inflator hose that's used to
inflate the BC goes over the diver's left shoulder
and then goes underneath the Velcro.

00:01:27.000 --> 00:01:33.000
The high pressure hose that goes to the gauge
console, travels underneath the diver's left arm

00:01:33.000 --> 00:01:40.000
and should be trapped in between the BC strap
and the diver's body so that the gauge console
always hangs out here.

00:01:40.000 --> 00:01:43.000
After we've checked all this, we'll go ahead and
spin the diver...

00:01:43.000 --> 00:01:46.000
...so that we can see the pony bottle system.

00:01:46.000 --> 00:01:51.000
This is NOAA's RASS or Redundant Air Supply
System.

00:01:51.000 --> 00:01:54.000
A 13 cu. ft. bottle in a bag...

00:01:54.000 --> 00:01:58.000
...with a sleeve for the second stage hose.

00:01:58.000 --> 00:02:04.000
And we can see how it's attached to the BC.
There is webbing that goes around the BC
bladder

00:02:04.000 --> 00:02:10.000
and then there's a D-ring and you need to run
the right shoulder strap through the D-ring.

00:02:10.000 --> 00:02:13.000
Now, to keep the pony bottle in the bag

00:02:13.000 --> 00:02:18.000
there is a bungee cord that wraps around the
yoke screw on the yoke strap.

00:02:18.000 --> 00:02:20.000
So we can see that here.

00:02:20.000 --> 00:02:24.000
To check the pony bottle system, we pressurize
and secure.

00:02:24.000 --> 00:02:30.000
When we do this we make sure there is space
in between the yoke strap and the knob. If there
wasn't space here -

00:02:30.000 --> 00:02:37.000
if this was touching the knob - it might be
difficult for the diver to turn the air on wearing
thick gloves when they're diving.

00:02:37.000 --> 00:02:39.000
After checking that,

00:02:39.000 --> 00:02:44.000
go ahead and make sure that the second stage
hose is routed properly through the sleeve

00:02:44.000 --> 00:02:51.000
and that the second stage is turned mouth piece down as the diver will be oriented in the water so that the second stage doesn't free-flow.

00:02:51.000 --> 00:02:54.000
Then we are going to check to make sure

00:02:54.000 --> 00:02:58.000
that the cylinder has at least 2700 psi in it.

00:02:58.000 --> 00:03:01.000
So that's the pony bottle system.

00:03:01.000 --> 00:03:05.000
Now - go ahead and turn a little bit more for me -

00:03:05.000 --> 00:03:08.000
we can see here, we can go back up to the
diver's left shoulder and we are going to check

00:03:08.000 --> 00:03:14.000
to make sure that the corrugated hose and the low pressure
inflator hose are trapped underneath the velcro.

00:03:14.000 --> 00:03:19.000
Then we travel down the length of the corrugated
hose, and make sure the plastic nut is tight

00:03:19.000 --> 00:03:22.000
and also that the low pressure inflator hose is
attached.

00:03:22.000 --> 00:03:28.000
to double check this you can push the inflator
button and also hit the purge button.

00:03:31.000 --> 00:03:36.000
Since we're up here by the diver's left shoulder,
we're going to check and look for a whistle.

00:03:36.000 --> 00:03:45.000
And from that point we can go to the chest strap
on the BC. This is optional, the diver chooses
whether or not they want to use this.

00:03:45.000 --> 00:03:52.000
From here, we get to the pressure gauge. Notice
how the hose travels underneath the diver's left
arm

00:03:52.000 --> 00:03:57.000
in between the BC shoulder strap and the diver's
body to keep the gauge console up front.

00:03:57.000 --> 00:04:02.000
And we can check the cylinder pressure, 2700
psi or greater --

00:04:02.000 --> 00:04:05.000
and continue down the front of the diver.

00:04:05.000 --> 00:04:07.000
From here we can get to the cummerbund

00:04:07.000 --> 00:04:10.000
and on top of that is going to be the plastic
buckle.

00:04:10.000 --> 00:04:15.000
next step down is to make sure that the weight
belt is right hand release.

00:04:15.000 --> 00:04:24.000
So this is right hand release but in this case the
diver is wearing a DUI harness. In order to dump
these weights the diver pulls the yellow handle.

00:04:24.000 --> 00:04:26.000
And that would dump the weight from the belt.

00:04:26.000 --> 00:04:31.000
If this was a standard weight belt and not a DUI
harness, we need to make sure that this buckle

00:04:31.000 --> 00:04:36.000
is not trapped underneath the cummerbund of
the BC otherwise the diver would not be able to
release it.

00:04:36.000 --> 00:04:47.000
And we continue down the diver - here the diver
is wearing a knife on the inside of the leg. The
knife has to be reachable with either hand.

00:04:47.000 --> 00:04:53.000
Then, of course, the diver has mask, snorkel,
fins, and appropriate exposure protection for this
dive.

00:04:53.000 --> 00:04:55.000
That's a predive safety check!

00:05:01.000 --> 00:05:09.000
...You know that stuff good enough...here's the
camband...

00:05:09.000 --> 00:05:12.000
Spin! Arms are up...

00:05:12.000 --> 00:05:24.000
Pressure secured. Of course you have to look at
pressure gauges...mouth piece down...dial a
breath...space...bungee cord...

00:05:31.000 --> 00:05:40.000
Velcro...nut...air...whistle...chest strap is
optional...buckle, cummerbund, weight belt is a
DUI with black handles...

00:05:40.000 --> 00:05:42.000
knife is reachable with either hand.

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