Scuba Cylinder Part 1 Flashcards Preview

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Flashcards in Scuba Cylinder Part 1 Deck (25)
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1
Q

scuba tanks are manufactured from which two materials?

A

Aluminum or Steel.

2
Q

Dive clubs and resorts use a variety of tank sizes, but what is the most common tank size?

A

The most common tank size used is the aluminum 80.

3
Q

What are the terms “low”, “standard”, “mid”, and “high” used to describe in regards to dive tanks?

A

This term describes a dive tanks service pressures.

4
Q

What are the 4 things you should consider when buying your own scuba cylinder?

A

The 4 things you should consider when buying your own scuba cylinder are.

  • that it fits your size,
  • your air consumption,
  • buoyancy
  • your type of diving,
5
Q

Aluminum 80s are most popular rental cylinders. ​ but how buoyant are they when empty? __ Pounds / __ Kilo.

A

Aluminum 80s like the Luxfer S080, Catalina & Coltri-Sub S80. are roughly 4 Pounds / 1.8 Kilo buoyant when empty.

6
Q

What are your options if the standard aluminum 80’s (26 inches long) is too big for you.

A

the aluminum 80 can be too long at 26 inches for many divers. But there are options: Luxfer makes an 80-cubic-foot aluminum tank that is fatter than normal (8 inches diameter instead of 7.25 inches) but 3 inches shorter. It’s also a little heavier.

7
Q

What are the most common scuba cylinder pressure ratings?

A

The most common pressures are “Low” (2400 to 2640 psi), (160 to 180 bar), “Standard” (3000 psi), (200 bar) and “High” (3300 to 3500 psi), (220 to 240 bar).

8
Q

What are the three general scuba cylinder classifications?

A

The three classifications are Painted, Galvanized, and Uncoated.

9
Q

Remember, there is no _______ tank for all diving conditions and all divers.

A

Remember, there is no “perfect” tank for all diving conditions and all divers.

10
Q

Volume is defined by the internal dimensions of the scuba cylinder, how is it normally measured?

A

Internal dimensions of the tank, is normally measured in cubic feet of water.

A typical cylinder carrying 80 standard cubic feet of air, is enough to fill a phone booth

11
Q

How is Capacity defined?

A

Capacity is defined by the amount of breathing gas, the scuba tank will hold at its maximum rated service pressure.

12
Q

When would a Steel tank produce corrosion?

A

Steel tanks produce corrosion in the presence of water, they consist of iron oxide and iron hydroxide?

13
Q

When would an aluminum tank produce corrosion?

A

Aluminum tanks produce corrosion in the presence of water, usually in the form of aluminum oxide and aluminum hydroxide?

14
Q

What are the most common reasons both steel and aluminum tanks fail inspection?

A

Internal corrosion and line corrosion around the boot. These are the most common reasons both steel and aluminum tanks fail inspection.

15
Q

Why do steel tanks require fewer materials than aluminum during construction?

A

Steel is stronger and more ductile (less brittle) than aluminum, so construction of a tank requires less steel than aluminum.

16
Q

A steel tank total weight is less than an aluminum tank. What does a standard aluminum 80-cubic-foot tank weigh __ pounds? Or __ kilos? What does a similar capacity steel tanks weigh in at __ pounds? Or __ kilos.

A

The standard aluminum 80-cubic-foot tank weighs 35 pounds Or 16 kilos, while similar capacity steel tanks weigh in at 30 pounds. Or 14 kilos.

17
Q

How long is the service life of a properly cared for steel tank?

A

The service life for steel tank is widely considered to be at least 40 years.

18
Q

How long is the service life of a properly cared for aluminum tank?

A

The service life of a properly cared for aluminum tank is controversial, some reputable filling stations, won’t fill an aluminum tank manufactured before 1990

19
Q

During the manufacturing process, aluminum tanks are strengthened using what method?

A

During manufacturing, aluminum tanks are strengthened using a special heating and cooling process.

20
Q

When an aluminum tank is subjected to temperatures above ___ ℉? Or ___ ℃? the walls of the tank will lose their strength?

A

If subjected to heat beyond 350℉ or 180℃, the walls of the tank can lose their strength and the tank will fail at normal service pressures.

21
Q

Which type of scuba cylinder would an experienced diver prefer the buoyancy characteristics of?

A

most experienced divers prefer the buoyancy characteristics of a steel tank.

❝ A Steel tank will change from negative at the start of a dive to neutral buoyancy at the end of a dive, this means the diver can start a dive with less weight and still be adequately weighted at the end of the dive.❞

22
Q

Aluminum tanks will change from ________? to ________? buoyancy as the diver breaths the contents.

A

Aluminum tanks will change from negative to positive buoyancy as the diver breaths the contents down.

23
Q

Steel tanks will change from ________? to _______?buoyancy as the diver breaths the contents down.

A

Steel tanks will change from negative to neutral buoyancy as the diver breaths the contents down.

24
Q

Which initial purchase price would be the lowest? An aluminum tank or a comparably sized steel tank.

A

The initial purchase price of aluminum tanks is significantly less than comparably sized steel tanks.

25
Q
A