Underwater Diving Plan – Assignment Instructions

Part 1

You are to make a plan for underwater diving in a self-contained diving suit. your plan would include a diagram that represents the diving depth in relation to the decompression level for diving on air; the number of air containers needed to have a safe expedition; a recommendation for a relevant use of an enriched air mixture of dioxygen (nitrox); at what precise maximum percentage of the air mixture should be used.
Diver profile:
  • Container characteristics:air consumption on the surface: 20L/min Internal volume: 16L
  • the purpose: to collect some samples Internal presssure: 23000 kPa
  • max depth to reach: 35 m mass of an empty container: 19.8 kg
  • atmospheric pressure: 100 kPa Estimated length of time to water temp: 20 degrees C collect: 60 min
  1.  what is the function of an underwater diving container?
  2. what is a level of decompression?
  3. what other questions will help you get more info on this project?
  4. give, in chronological order, the principal stages of this project.

Part 2

Gathering information:

  1. What are the 4 variables that characterize a sample of gas?
  2. How does the pressure of a gas vary in relation to water depth?
  3. How do you calculate the pressure od a given underwater depth?
  4. What it the pressure exerted on a diver at 30m? explain.
  5. what parts of the body are most affected by the variations of pressure when diving? explain.
  6. What are the formulas that pertain to the 4 variables that characterize gas? Indicate what each variable represents and the units used

Part 3

  1. If a diver holds his breath, what is the change in the volume of air in his lungs as he decends? Explain.
  2. Why is it important not to hold your breath when going back up the surface?
  3. What should the diver do to conserve the same respiratory volume on the surface?
  4. What is the result of this action on the concentration of air in the lungs? Explain with the help of your knowledge in gases.
  5. What is the partial pressure of gas?
  6. What is the law of partial pressures?
  7. What mathematical formulas are associated with the law of partial pressures?

Part 4

  1. When diving on air, how do you calculate the partial pressure of nitrogen in a given depth?
  2. How do you calculate the maximum percentage of dioxygen to be used in a nitrox mixture?
  3. Why is the max depth of a dive in the air established at 60 m?
  4. If a person inhales pure dioxygen at sea level, will it exceed the threshold of toxicity of dioxygen? Explain.
  5. How do you determine the number of decompression level needed while going back up the surface?
  6. How do you calculate the time needed to reach a maximum depth?
  7. How do you calculate the duration of a dive, up to the moment where the diver decides to resurface?
  8. What formula allows you to calculate the quantity of air needed to dive at a given depth?

Part 6

Explanations:

  1.  with the use of a graph, represent the expedition that was planned. Don’t forget to use the levels of decompression.
  2. Calculate the quantity of air containers needed for a safe expedition.
  3. Do you recommend the use of enriched dioxygen? If yes, what is the maximum percentage of dioxygen should the enriched air contain?

Validation/Justification

  1. What are the advantages of your plan? Explain your answer.
  2. What are the disadvantages of your plan? explain your answer 3. Justify your recommendtion regarding the use of enriched air.
  3. What chemical laws and principles should we use in planning an underwater diving? Explain.
  4. What improvements can you give to the plan of this underwater diving expedition?
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