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Oxygen Enriched Air for Surface Supplied Diving Course

EnviroDive wrote the book on gas blending...The PADI/DSAT book!

This course is specifically designed for occupational divers. Both Canadian and US Navy versions are available.

The EnviroDive Services "Oxygen Enriched Air for Surface Supplied Diving" course is unique as it is the only comprehensive course of its kind that is specifically written for surface supplied oxygen enriched air operations.

Commercial divers are faced with factors such as lengthy decompression stops and SurDO2's that recreational divers don't have to consider. This one day course is a favorite for many inland commercial diving operations and organizations such as the US Army Corp of Engineers.

Course Objectives:

On completion of this course you will have a comprehensive understanding of;

  • The tools to develop custom dive plans for any depth to 110 feet of sea water
  • Pressure at depth, expressing feet of sea water as pressure in atmospheres absolute
  • The maximum operating depth for a given fraction of oxygen in the gas mix
  • The best mix for the dive (fraction of gas)
  • Oxygen dose (partial pressures of oxygen)
  • The physiology of decompression illness
  • The physiology of oxygen toxicity
  • How to track central nervous system oxygen exposure for single and repetitive exposures, based on the "NOAA CNS exposure table" (DCIEM Table 2(N))
  • How to track "Pulmonary" oxygen exposure for in-water exposures and Sur D O2's.
  • Equivalent air depths (DCIEM EAD formula and Table 1(N))
  • In water oxygen decompression (DCIEM Tables 2, 2S, and 2M)
  • Tracking oxygen exposure for surface decompression with oxygen (DCIEM table 3)
  • Equivalent air depth for dives at altitude (DCIEM Table 5)
  • Equivalent stop depths for oxygen enriched air decompression

Course Limits:

  • Depth limit of 110 fsw (DCIEM maximum depth exposure for oxygen enriched air dives)
  • Maximum partial pressure exposure to oxygen is 1.4, with exceptional exposures to 1.5, for diving, and 1.6, for in-water decompression and 2.2 for Sur D O2
  • Oxygen enriched air mixes up to 40 percent oxygen for diving (FO2 of .40)
  • Oxygen concentrations up to 100 percent while decompressing in water (FO2 of 1.6)
  • Oxygen concentrations of up to 100 percent on the surface and SurDO2 (FO2 of 2.2)

The primary operational difference between this course and the "Oxygen Enriched Air for Occupational Scuba Diving" course is the utilization of higher partial pressures of oxygen. This is possible due to the use of full-face masks or diving helmets.

Full utilization of the higher oxygen partial pressures in conjunction with a virtually unlimited gas supply makes for very long (read productive) bottom times. The decompression obligations that are the result of long bottom times are minimized by diving with oxygen enriched air, and decompressing with either oxygen enriched air or pure oxygen. This is possible because we can manipulate the gas mixture for minimum nitrogen "on gassing" of the divers tissues while descending and at depth, and then enhance the maximum nitrogen elimination while ascending and at the surface.

This Certification Course Includes:


Chapter 1 - Physiology

Chapter 2 - Physics

  • Fraction of Gas (Fg)
  • Equivalent Air Depth (EAD)
  • Partial Pressure of a Gas (Pg)
  • Depth Expressed in Atmospheres Absolute (Pata)
  • Maximum Operating Depth (MOD)
  • Circle T Equation

Chapter 3 - Effects of Oxygen

  • CNS% Oxygen Tracking
  • Oxygen Credit
  • Oxygen Toxicity
  • Emergency Management of an Oxygen Toxicity Event
  • Pulmonary Oxygen Dose
  • In-water Decompression
  • OEA Adjusted Deco Stop Depths
  • Altitude Diving with OEA
  • Acclimatization
  • EAD’s at Altitude

Chapter 4 - Technical Information

  • Cylinder Identification
  • Oxygen Analysis
  • Special Equipment Requirements
  • Oxygen Service
  • Gas Blending
  • Fill Log

Chapter 5 - Workbook

Appendix I - Answers to Review Questions

Appendix II - Equivalent Air Depth & PO2 Table

Tables & Charts:

  • Depth vs ATA’s
  • NOAA O2 Partial Pressure & Exposure Time Limits
  • UPTD’s
  • Maximum Allowable Daily Dose(s)
  • OEA Adjusted Stop Depths
  • Fill Log


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