INTRODUCTION

This course provides the training required to allow candidates to competently and safely blend nitrox gas.

COURSE OBJECTIVES

The objective of this course is to train candidates in the proper techniques, equipment requirements and hazards involved in blending nitrox gases for recreational scuba.

QUALIFICATIONS OF GRADUATES

Upon successful completion of this course, graduates may engage in the blending of nitrox gases, without direct supervision.

WHO MAY TEACH

Any active TDI Nitrox Gas Blender Instructor may teach this course.

STUDENT - INSTRUCTOR RATIO

Classroom
Unlimited, so long as adequate facility, supplies, and additional time are provided to insure comprehensive and complete training.

STUDENT PRE-REQUISITES

Minimum age 18

REQUIRED COURSE MINIMUMS

Classroom Hours -2
Candidates must successfully blend and analyze 5 cylinders of nitrox gas

REQUIRED SUBJECT AREAS
The following topics must be covered during this course. The TDI Nitrox Gas Blending manual is mandatory for use during this course but instructors may also use any additional text or materials that they feel help present these topics.

A. The Responsibility of the Gas Blender

B. Gases of Diving
1. Air
2. Oxygen
3. Nitrogen

C. Oxygen Handling
1. Oxygen hazards
2. Causes and prevention of oxygen fire
3. Oxygen system design
4. Local regulations for gas blending and handling

D. Gas Production Equipment
1. Compressors
2. Cylinders
3. Filtration systems
4. Analog gauges

E. Mixing Techniques
1. General Considerations
2. Continuous blending systems
3. De-nitrogenated air systems
4. Pre-mix systems
5. Partial pressure blending mathematics

F. Oxygen Analysis
1. Procedures
2. Oxygen analyzers

G. Cylinder Handling & Sign Out

GRADUATION REQUIREMENTS

In order to complete this course, students must:
A. Satisfactorily complete the TDI Nitrox Gas Blender written examination.
B. Demonstrate understanding of nitrox blending and oxygen analysis

SUPPORT MATERIALS

A. TDI Student Record Folder
B. TDI Nitrox Gas Blending Manual
C. TDI Nitrox Gas Blending Overheads / Power Point Presentation