CHAPTER 2: Scuba Diving

1
CHAPTER 2 Scuba Diving
2
The Scuba Unit

• Tank
• Regulator
• Buoyancy Compensator (BC)
• Monitoring instruments (dive computer, compass,
  etc.)

3
Buoyancy Compensator (BC)
4
Tank
5
DIN valve
K-valve
O-ring
6
(No Transcript)
7
Regulators
Regulators are designed to deliver air on
demand. As the diver inhales, air is allowed to
flow to the diver.
8
First Stage - reduces high pressured air from the
tank to intermediate air pressure.
Second Stage
Second Stage reduces the intermediate pressure
to ambient pressure.
First Stage
9
(No Transcript)
10
(No Transcript)
11
Monitoring Instruments
12
Assembling the Scuba Unit
1. Examine the cylinder and valve for overall
condition.
2. Attach BC to cylinder, so that the cylinder
retaining band buckling mechanism is facing you.
3. Remove dust cover from regulator and quickly
check the first-stage filter.
13

• Before you turn on the air
• Attempt to exhale through the second-stage.
• Gently attempt to inhale from each second-stage.
• Check the mouthpieces for condition and proper
  attachment.
• Check the gauges.

5. Turn gauge face down and away from yourself
and others, slowly pressurize the system.
14
6. Inflate and deflate BC orally and manually
7. Once the scuba unit is assembled, lay it down
15
Disassembling the Scuba Unit
1. Shut off the tank valve and vent pressure
through the second-stage purge valve(s).
2. Unhook the low-pressure power inflator hose.
3. Unhook any scuba system attachments, I.e.,
guage clips, octopus clips, etc.
4. Remove the regulator yoke.
16
5. Make sure the dust cap is clean and dry and
replace it. To dry, simply shake off the excess
water or use a towel.
6. Remove the BC and empty water by inflating it
and then holding it up in an inverted position
and depressing the deflator button on the
inflator hose.
7. Lay the tank down.