Predive Safety Check
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Predive Safety Check
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Hi! My name is Bill Gordon. I'm one of the
instructors at the NOAA Diving Center in
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What we are about to go over is NOAA's version
of a predive safety check.
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This is our opportunity to catch about 95% of
diving problems before they get in the water.
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We try to catch those in the predive safety
check. So, let's go ahead and start!
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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.
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It should be perpendicular to the long axis of the
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Then travel up...
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Make sure the air is all the way on, a quarter
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While we are here we are going to go ahead and
check all the hoses: make sure they are more
than hand tight.
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Then we are going to go ahead and check where
the corrugated hose attaches to the BC. Make
sure that's tight.
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This is a remote dump. Make sure that that is
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And then most BCs will have a remote dump
somewhere by the diver's hip.
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In this case, the BC has it down by the diver's
right hip. So, we'll go ahead and check that.
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And we are going to go ahead and check hose
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So, the primary second stage - the one the diver
breathes from - should travel over the diver's right
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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.
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The high pressure hose that goes to the gauge
console, travels underneath the diver's left arm
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and should be trapped in between the BC strap
and the diver's body so that the gauge console
always hangs out here.
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After we've checked all this, we'll go ahead and
spin the diver...
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...so that we can see the pony bottle system.
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This is NOAA's RASS or Redundant Air Supply
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A 13 cu. ft. bottle in a bag...
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...with a sleeve for the second stage hose.
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And we can see how it's attached to the BC.
There is webbing that goes around the BC
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and then there's a D-ring and you need to run
the right shoulder strap through the D-ring.
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Now, to keep the pony bottle in the bag
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there is a bungee cord that wraps around the
yoke screw on the yoke strap.
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So we can see that here.
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To check the pony bottle system, we pressurize
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When we do this we make sure there is space
in between the yoke strap and the knob. If there
wasn't space here -
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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.
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After checking that,
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go ahead and make sure that the second stage
hose is routed properly through the sleeve
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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.
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Then we are going to check to make sure
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that the cylinder has at least 2700 psi in it.
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So that's the pony bottle system.
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Now - go ahead and turn a little bit more for me -
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we can see here, we can go back up to the
diver's left shoulder and we are going to check
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to make sure that the corrugated hose and the low pressure
inflator hose are trapped underneath the velcro.
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Then we travel down the length of the corrugated
hose, and make sure the plastic nut is tight
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and also that the low pressure inflator hose is
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to double check this you can push the inflator
button and also hit the purge button.
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Since we're up here by the diver's left shoulder,
we're going to check and look for a whistle.
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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.
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From here, we get to the pressure gauge. Notice
how the hose travels underneath the diver's left
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in between the BC shoulder strap and the diver's
body to keep the gauge console up front.
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And we can check the cylinder pressure, 2700
psi or greater --
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and continue down the front of the diver.
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From here we can get to the cummerbund
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and on top of that is going to be the plastic
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next step down is to make sure that the weight
belt is right hand release.
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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.
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And that would dump the weight from the belt.
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If this was a standard weight belt and not a DUI
harness, we need to make sure that this buckle
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is not trapped underneath the cummerbund of
the BC otherwise the diver would not be able to
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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.
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Then, of course, the diver has mask, snorkel,
fins, and appropriate exposure protection for this
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That's a predive safety check!
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...You know that stuff good enough...here's the
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Spin! Arms are up...
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Pressure secured. Of course you have to look at
pressure gauges...mouth piece down...dial a
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Velcro...nut...air...whistle...chest strap is
optional...buckle, cummerbund, weight belt is a
DUI with black handles...
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knife is reachable with either hand.
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