1. Chapter 2 Scuba Diving Tanks / Air Cylinders Valves
Buoyancy Compensators
Weight Systems
Regulators
Datalog / Dive Log
Dive Accessories
2-1

2. 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

3. 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

4. Scuba Tanks Purpose Types Maintenance and Storage Size Materials
Coatings
Selection
Maintenance and Storage
2-4

5. Scuba Tanks Tank Markings Hydro Testing (5/3-10%) Government Approved
Type of Material
Working Pressure
Tank Volume
Serial Number
Manufacturer
Hydro Date
VIP
Hydro Testing (5/3-10%)
2-5

6. Scuba Tanks Valves Purpose Types Features Maintenance K, J DIN O ring
Burst Disc
Maintenance
2-6

7. Regulators First Stage Second Stage Maintenance and Storage Features
Downstream
Pilot Valve
Features
Materials
Mouthpiece
Purge Valve
Exhaust Valve
Adjustments
Maintenance and Storage
Post Dive
Annual Service
Transportation and Storage
2-7

8. Alternate Air Sources Purpose Types Redundant Air System
Octopus
Integrated with Power Inflator
Redundant Air System
Maintenance and Storage
2-8

9. SPG (Submersible Pressure Gauge)
Instruments
SPG (Submersible Pressure Gauge)
Purpose
Air Supply
Types
Analog
Digital / LCD
Wireless
2-9

10. Instruments Depth Gauge Purpose Types Maintenance / Storage Capillary
Oil Filled
Open Bourdon Tube
Diaphragm
Maintenance / Storage
2-10

11. Instruments Timing Device Purpose Types Features
Watch
Dive Timer
Features
Maintenance and Storage
2-11

12. Instruments Compass Purpose Types Features Maintenance and Storage
Bezel
Card, Needle
Side Window
Numerical Markings
Maintenance and Storage
2-12

13. Dive Computers Purpose and Function Features Pros and Cons Selection
Transportation and Storage
Maintenance
2-13

14. Datalog/Dive Log Purpose Datalog and Features Pre-Dive Checklists
Training Record
2-14

15. Accessories Dive Flag or Float Whistle Signal Lights Underwater Lights
Purpose
Types
Use
Whistle
Location
Signal Lights
Underwater Lights
Types
Maintenance
Dive Knife
Purpose
Location
Thermometer
Slate
Equipment Bag
Spare Parts Kit
2-15

16. 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

17. 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