Equipment Flashcards
What temperature, if accidentally exposing a scuba cylinder to or greater than, should you have the cylinder hydrostatically tested?
If accidentally exposing a scuba cylinder to 82 degress Celsius or greater, you should have the cylinder hydrostatically tested.
During hydrostatic testing, the tester will immerse the scuba tank in water and fill it with what?
During hydrostatic testing, the tester will immerse the scuba tank in water and fill it with water.
The type of scuba reguloator that screws directly into the tank valve and is useful for overhead environments is known as what?
The type of scuba reguloator that screws directly into the tank valve and is useful for overhead environments is known as
DIN (Deutsche Industrie Norm).
Failing to monitor depth and timing devices can significantly increase the chances of causing what condition?
Failing to monitor depth and timing devices can significantly increase the chances of causing DCS (Decompression Sickness).
The fail safe in a downstream valve regulator, is that in the event of a regulator malfunction, it will do what?
The fail safe in a downstream valve regulator, is that in the event of a regulator malfunction, it will free flow.
After diving with an aluminum tank, a diver decides to use a steel tank.
What equipment adjustment would need to be made changing to a steel tank?
After diving with an aluminum tank, a diver decides to use a steel tank.
The amount of weight would need to be decreased becauase the steel tank is less buoyant.
What the benefits of a balanced regulator as opposed to an unbalanced regulator?
The benefits of a balanced regulator as opposed to an unbalanced regulator are that it delivers air at the same rate even if the tank is low or more than two divers are breathing from the same set at once.
A pilot valve is a diaphragm that opens a smaller valve that opens the main valve by creating a pressure imbalance, found in what stage of the regulator?
A pilot valve is a diaphragm that opens a smaller valve that opens the main valve by creating a pressure imbalance, found in the second stage of the regulator.
A capillary gauge is designed to work at sea level and altitude according to which Law?
A capillary gauge is designed to work at sea level and altitude according to Boyle’s Law.
Which stage of a regulator reduces high pressure from a tank to an intermediate pressure?
The first stage of a regulator reduces high pressure from a tank to an intermediate pressure.
An Environmental Seal design protects a regulator from what?
An Environmental Seal design protects a regulator from freezing up in extremely cold water.
How can water enter a scuba cylinder?
Water can enter a scuba cylinder by:
- Improperly operated or maintained compressor
- Droplets in tank valve during fill
- Backflow through reg when tank is empty
- Changes in temp when tank is empty/valve left open
- Bleeding air rapidly, causing internal condensation
What are the signs of moisture accumulation in a cylinder?
The signs of moisture accumulation in a cylinder are:
- White mist when** **opening** **valve
- Sloshing sound
- Air has** **bad** **odor
What is the purpose of the valve snorkel?
The purpose of the valve snorkel is to prevent foreign matter from entering the valve.
What is the standard on/off cylinder valve called?
The standard on/off cylinder valve is the K-Valve.
What is the type of valve that was popular before submersible pressure gauges, but is not used today?
The type of valve that was popular before submersible pressure gauges, but is not used today is the J-Valve.
In some countries you”ll find a dual valve for a single cylinder.
What types of valves are these?
In some countries you”ll find a dual valve for a single cylinder. These types of valves are the H valve or the Y valve.
What reasons would you use a Y valve or an H valve?
The reasons you would use a Y valve or an H valve are they allow attachment of 2nd reg for redundancy
(Deep dives or enclosure dives on a single cylinder)
The 2nd stage reduces intermediate pressure to what type of pressure?
The 2nd stage reduces intermediate pressure to an ambient pressure.
In what type of valve regulator is the operation of the regulator independent of the cylinders pressure?
In a balanced-valve regulator, the operation of the regulator is independent of the cylinders pressure.
What valve is one that opens with high-pressure air flow?
A downstream valve is one that opens with high-pressure air flow.
What valves are rarely used in modern regulators because of their tendency to fail in a closed position?
Upstream valves are rarely used in modern regulators because of their tendency to fail in a closed position.
What are the two basic types of internal valves of first stages, both of which are produced in a balanced or unbalanced configuration?
The two basic types of internal valves of first stages, both of which are produced in a balanced or unbalanced configuration are the diaphragm and piston.
The main valve of what valve regulator (2nd stage) is opened and closed with air pressure, rather than mechanical leverage?
The main valve of a pilot valve regulator (2nd stage) is opened and closed with air pressure, rather than mechanical leverage.
