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.

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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

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Scuba Tanks

Purpose Types

Size Materials Coatings Selection

Maintenance and Storage

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Scuba Tanks Tank Markings

Government Approved Type of Material Working Pressure Tank Volume Serial Number Manufacturer Hydro Date VIP

Hydro Testing (5/3-10%)

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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

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Alternate Air Sources

Purpose Types

Octopus Integrated with Power

Inflator Redundant Air System Maintenance and

Storage

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Instruments

SPG (Submersible Pressure Gauge)

PurposeAir Supply

TypesAnalogDigital / LCDWireless

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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

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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

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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?

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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.

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