Dive Operations III

Course Description

Theory of helium-oxygen commercial diving, practical applications of mixed gas diving used in various commercial diving operations, surface supply helium-oxygen diving, bell diving, advanced thermal protection, saturation diving theory, and theory of splitting and mixing of gases.

Learning Outcomes

  • Describe the theory and historical events leading to the development of helium-oxygen diving and various modes of operational mixed gas diving for closed and open bell diving.
  • Explain the theory and concepts of mixed gas diving and to compute gas formulas related to mixed gas diving
  • Apply basic gas laws (Boyle’s Law, Charles/Gay-Lussic’s Law, General Gas Law, and Daltons Law) to solve mixed gas formulas for helium-oxygen diving.
  • Calculate diver breathing gas requirements, gas consumption rates, bailout requirements, and gas diving systems gas needs for mixed gas diving.
  • Demonstrate the ability to select a decompression table for surface supply and bell diving and to calculate the partial pressure of various gas percentages, solve max depth, cutoff depth, and effective atmospheres for helium-oxygen dives.
  • Select proper decompression tables and schedules using the U.S. Navy HeO2 Decompression Tables; to decompress divers using in-water decompression, in-water oxygen decompression, surface decompression, and the various emergency procedures related to decompression procedures.
  • Explain how to resolve omitted decompression issues during decompression, surface intervals, or during chamber surface decompression.
  • Explain the concepts and theory of saturation diving and the concept of closed circuit, semi-closed circuit, umbilical supply, and emergency bailout supply.
  • List and describe the support systems needed to support a saturation and/or closed bell diving systems.
  • Explain the various methods of carbon dioxide scrubbers and safe handling of CO2 adsorbent.
  • Demonstrate the ability to use the saturation unlimited excursion tables and to properly conduct saturation compression, excursions, and decompression.
  • Describe the procedures for selection and analysis of deck decompression chamber and bell atmospheres and fire zone precautions and calculations.
  • Describe the medical problems associated with deep diving including: thermal considerations, high pressure nervous syndrome, caustic canister floodout, oxygen toxicity (CNS and Pulmonary), and decompression sickness.
  • Demonstrate the ability to analyze gases used in diving and to determine safe limits.
  • Explain the various methods of thermal protection for diving and to safely use the various suits and hot water support equipment.
  • Demonstrate the ability to dive using mixed gas and to shift gas breathing media during decompression.


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