Lone Star Scuba Dallas

Trimix Class / Course / Certification

(Also known as Entry Trimix or Normoxic Trimix)

OVERVIEW

The TDI ( Technical Diving International ) Trimix Course provides the training required to competently and safely utilize breathing normoxic gases containing helium for dives that require staged decompression, utilizing Nitrox and / or oxygen mixtures during decompression to a maximum depth of sixty (60) msw / two hundred (200) fsw.  The objective of this course is to train divers in the benefits, hazards and proper procedures of utilizing custom oxygen / helium / nitrogen mixtures as breathing gases.

QUALIFICATIONS OF GRADUATES

Upon successful completion of this course, graduates are considered competent to plan and execute technical dives that require stage decompression and utilize normoxic (18% or higher oxygen) helium-based tri-mix breathing gas mixtures and EANx and/or oxygen for stage decompression without direct supervision to depths not to exceed 200 fsw (60 msw) provided the diving activities and the areas dived approximate those of training.

PREREQUISITES FOR ENTERING THE COURSE

• Minimum age of 18
  
• Minimum certification as a TDI Advanced Nitrox Diver and Decompression Procedures Diver (or equivalent)
  
• Show proof of a minimum of 100 logged dives or equivalent at the discretion of the instructor

COURSE POLICIES

• Classroom Briefing Hours - 8
  
• Openwater Dives - 4 successfully executed dives with a minimum accumulated bottom time of 100 minutes,
  with at least two dives deeper than 130 fsw /40 msw

REQUIRED EQUIPMENT

The following equipment is required for each student

• Bottom Mix Cylinder(s)
  1. Cylinder volume appropriate for planned dive and student gas consumption
  2. Dual outlet valve, double manifold or independent doubles
  3. Labeled in accordance with TDI Standards
  
• Travel Mix Cylinder(s)
  1. Cylinder volume appropriate for planned dive and student gas consumption
  2. Labeled in accordance with TDI Standards
  
• Decompression Mix Cylinder(s)
  1. Cylinder volume appropriate for planned dive and student gas consumption
  2. Labeled in accordance with TDI Standards
  
• Suit Inflation Cylinder (required for drysuit divers only)
  
• Regulators
  1. Primary and primary redundant required on all bottom mix cylinder(s)
  2. Submersible pressure gauges are required on all primary / bottom mix cylinders
  3. A contingency use long hose second stage should be designated and appropriately
  rigged to facilitate air sharing at depth if necessary
  4. Stage or decompression regulators need a pressure gauge and asecond stage with an adequate length hose.
  5. It is strongly recommended that all required regulators be all DIN or all yoke
  6. Regulators should be oxygen clean where necessary (ie, decompression and maybe stage regulators)
  
• Buoyancy Compensator(s) adequate for equipment configuration
  
• Redundant Depth and Timing Devices
  
• Redundant Light System (one primary of adequate brightness and duration plus two back-up lights)
  
• Ascent Reel with Lift Bag/Surface Marker Buoy
  1. Adequate for maximum planned depth
  2. Minimum of 50 lb. lift bag (a dump valve highly recommended)
  
• Exposure Suit adequate for the openwater environment
  
• Line Cutting Device
  
• Underwater Slate or Notebook (for decompression / contingency tables)
  
  

Required Skill Performance and Graduation Requirements

In order to complete this course, students must: 

• Satisfactorily complete the Trimix Course written examination.
  
• Complete all open water requirements safely and efficiently.
  
• Demonstrate mature, sound judgment concerning dive planning and execution.