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Chapter 2 Scuba Diving Tanks / Air Cylinders Valves Buoyancy
Compensators Weight Systems Regulators Datalog / Dive Log Dive Accessories2-1
Objectives
Discuss the differences in the equipment’s function from snorkeling to scuba diving.
Define all the necessary components that comprise the scuba system.
Introduce some accessories for consideration.
Discuss the divelog or datalog as a legal document to verify training.
2-2
Buoyancy Compensators Purpose Types
Front Mount or Snorkel Vest
Back Mount Jacket Style Advanced Design
Construction
Features Oral Inflator Valve Automatic Inflator Dump Valve/
Deflators Pockets
Adjustment and Fit Maintenance and
Storage
2-3
Scuba Tanks
Purpose Types
Size Materials Coatings Selection
Maintenance and Storage
2-4
Scuba Tanks Tank Markings
Government Approved Type of Material Working Pressure Tank Volume Serial Number Manufacturer Hydro Date VIP
Hydro Testing (5/3-10%)
2-5
Scuba Tanks
Valves Purpose Types
K, JDIN
FeaturesO ringBurst Disc
Maintenance2-6
Regulators
First Stage Second Stage
Downstream Pilot Valve
Features Materials Mouthpiece Purge Valve
Exhaust Valve Adjustments
Maintenance and Storage Post Dive Annual Service Transportation and
Storage
2-7
Alternate Air Sources
Purpose Types
Octopus Integrated with Power
Inflator Redundant Air System Maintenance and
Storage
2-8
Instruments
SPG (Submersible Pressure Gauge)
PurposeAir Supply
TypesAnalogDigital / LCDWireless
2-9
Instruments
Depth Gauge Purpose Types
CapillaryOil FilledOpen Bourdon
TubeDiaphragm
Maintenance / Storage2-10
Instruments
Timing Device Purpose Types
WatchDive Timer
Features Maintenance and
Storage2-11
Instruments
Compass Purpose Types Features
BezelCard, NeedleSide WindowNumerical Markings
Maintenance and Storage2-12
Dive Computers
Purpose and Function
Features Pros and Cons Selection Transportation and
Storage Maintenance2-13
Datalog/Dive Log
Purpose Datalog and
Features Pre-Dive
Checklists Training Record
2-14
Accessories Dive Flag or Float
Purpose Types Use
Whistle Purpose Location
Signal Lights Purpose Types
Underwater Lights Types Maintenance
Dive Knife Purpose Types Location
Thermometer Slate Equipment Bag Spare Parts Kit
2-15
Discussion Questions/Review List some of the features that can be
found on a buoyancy compensator.
Describe how a two stage regulator works.
In addition to the second stage, what other items can be attached to the first stage of the regulator?
What gauges should the diver have in order to dive safely?
Explain the difference between a “ J" Valve, a "K" Valve, and a "DIN" Valve.
What are the two types of scuba cylinder inspections, and how often should they be performed?
Describe how a dive partner might perform a pre-dive safety check.
Describe how a diver clears water from the mask.
In an effort to establish positive buoyancy, how would a diver release his weight belt in the water?
2-16
Summary
Public Safety Diving is a rewarding activity once you begin to get comfortable with the necessary techniques and equipment. Getting to know your team’s equipment, training with it and the proper organization and care will all lead to a more efficient and effective diver and dive operation.
2-17