Chapter 8

Question 1

What is the purpose and function of a BC?

Answer 1

1. Serves as a harness that attaches the cylinder and regulator system to the diver.
2. It can hold objects
3. It enables divers to establish positive buoyancy for swimming and resting at the surface.
4. Enables divers to compensate for exposure suit compression and helps maintain neutral buoyancy.

Question 2

What are the features of a BC?

Answer 2

1. Standard Power inflation/Deflation Mechanism.
2. Alternate Air-Source Inflators.
3. Shoulder Strap Quick Releases.
4. Integrated Weight System
5. Pockets
6. Accessory D-Ring
7. BC Hose Exhaust Valve
   Remote Exhaust Valve

Question 3

What are the 2 most common types of weight systems?

Answer 3

1. Weight integrated BCs
2. Conventional weight belts

Question 4

What are the features and benefits of a weight integrated BC?

Answer 4

They are more comfortable and convenient and give users the option to drop some or most of their weight.

Question 5

What is the primary function of the scuba regulator?

Answer 5

To reduce high-pressure air in the scuba cylinder to ambient pressure, making it easier to breath underwater.

Question 6

What are some desirable features a regulator may have?

Answer 6

1. First Stage: Attaches to the tank valve and reduces the high pressure air to an intermediate pressure (around 10 bar/150 psi over ambient pressure)
2. Primary Second Stage: Reduces intermediate pressure air from the first stage to ambient pressure.
3. An Alternate Air Source second stage
4. A submersible pressure gauge and/or instrument console
5. A low pressure inflator hose for the BC

Question 7

What materials are most commonly used to make scuba cylinders?

Answer 7

Aluminum or steel

Question 8

What periodic tests or inspections must cylinders undergo?

Answer 8

1. Hydrostatic Testing: A cylinder is placed within a container of water and pressurized
2. Visual Inspection: A qualified service technician conducts a careful inspection of the cylinder.