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20 Cards in this Set
- Front
- Back
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What is the title of Chapter 16 of the US Navy Dive Manual titled?
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Breathing Gas Mixing Procedures
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What are two ways of mixing gases?
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Partial Pressure, Continuous-flow, or by volume or weight.
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Aboard ships what method is generally used to mix gases?
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Partial pressure or continuous-flow.
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Aboard shore facilities what method is generally used to mix gases?
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by volume or weight.
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Mixing by partial pressure is based on what gas law?
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Dalton's Law
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What does Dalton's Law state?
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The total pressure of a mixture is equal to the sum of the partial pressures of all the gases in the mixture.
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In what ways can the partial pressure of a gas be measured?
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Ideal-gas (perfect-gas) method or real-gas method
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What is Ideal-Gas method?
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Ideal gas method assumes that pressure is directly proportional to the temperature and density of a gas.
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What is Real-Gas method?
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The real gas method additionally accounts for the fact that some gases will compress more or less than other gases.
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What gas compress' more, Oxygen or Helium.
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Oxygen.
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True or False. If a cylinder is filled with 1000psia of Oxygen and topped off with 1000psia of Helium the cylinder will contain more Oxygen.
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True.
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What equipment and material is required to mix gases?
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Inert gas, Oxygen, mix cylinders or flasks, an oxygen analyzer, and a mixing manifold. A gas transfer system may or may not be required.
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Since heating of the gases and its cylinder during compression will give false readings, you should let the cylinder rest for _:_.
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6 hours.
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Using an oxygen transfer pump draws oxygen from a lower pressured cylinder and transfers the oxygen to a higher pressured cylinder therefore….
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Conserving gas.
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In a continuous-flow mixing system, constituent gases are regulated to the same ___ and ___ before being metered.
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Temperature and Pressure.
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Describe Mixing by Volume method.
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Mixing by volume, is know volumes of gases are mixed at near atmospheric pressures then compressed into a storage cylinder.
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Describe Mixing by Weight method.
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Mixing by weighing gases. Accuracy dependent on scale accuracy, know weight of cylinder. Always analyze mixture with Oxygen Analyzer.
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Why is gas analysis so important in diving?
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Adverse physiological reactions can occur when exposure time and concentrations of various components the breathing atmosphere very from prescribed limits.
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When selecting analyzing instruments, two things that should be considered are…
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accuracy and response time of the instrument.
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Guidance for choosing analytical instruments can be obtained from….
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NAVSEA, NEDU or from instrument manufacturer technical representatives.
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