Nitrox and Mixed Gas Blender Courses

nitrox blender front 17 001 300x189 BSAC Nitrox and Mixed Gas Blender

Nitrox contains two different types of gas, namely Nitrogen and Oxygen – the same gases that are found in Air. The difference between Nitrox and Air is the percentage of Oxygen that is contained within the gas. From your entry level diver training course, you will be aware of the effects of increase nitrogen when breathed at depth. If you are Nitrox trained, you will also be aware of the problems that relates to Oxygen and its toxicity properties when breathed at depth. The accuracy of the Nitrox mixes is crucial to both the dive plan and the diver, if problems with Oxygen Toxicity are to be avoided.

As a Nitrox Blender, it is your responsibility to mix the required gas to the correct percentage for the planned dive. Technical Divers may be diving to depths beyond the maximum threshold levels for oxygen toxicity. Therefore for these divers who are diving to such depths, a third gas must be added to reduce the Oxygen percentage. This third gas, which is Helium, also has its own problems when being used for diving. When we have a mix of these three gases, the mix is known has “Trimix” The process of mixing these gases is called Mix Gas Blending.

Big Blue Package – 10,000 THB
- Air Conditioned Accommodation
- Certification

- Study Crew Pack with reference CD-Rom
- Big Blue BSAC Club T-Shirt and Mask Strap

Course aims:

To safely train divers and others involved in BSAC diving activities with little or no knowledge and experience of Nitrox blending and or mixed gas blending, paying particular attention to precautions required to safely manage and handle blending equipment.

The course assumes the most rudimentary blending system to enable high pressure filling by the most commonly found method called partial pressure filling. The course identifies the issues and processes to fill SCUBA cylinders up to 300 –bar pressure.

Entry Level:

This course is open to BSAC Ocean Divers and above or equivalent with a minimum age of 18 years old. The course is also open to divers who already hold similar Nitrox Blender qualifications from other agencies.

Course Duration:

The Gas Blender Course is split into two separate courses. These courses are, the BSAC Nitrox Blender course and the Mixed Gas Blender course.

Before proceeding to the Mixed Gas Blender course, the student(s) must have attended the Nitrox Blender course and must have successfully passed the BSAC Nitrox Blender practical assessment.

The course duration is 1 day, if both courses are run together. The duration of each individual course is,

The Nitrox Blender course is 4.5 hours
The Mixed Gas Blender is 3 hours

Although it is not entirely essential for this blending course, it is recommended that you should have attended the BSAC Compressor Operation course prior to this course. The practical lessons will involve the use of a Gas compressor and holding this qualification, would be beneficial to you on this course.

Nitrox Blender Theory lessons:

There are 5 – Nitrox Blender theory lessons, with 1 additional lesson covering Mix Gas Blending if the student wishes to complete the Mixed Gas Blending course.

The theory lessons starts with a recap on Nitrox definitions, pressure and gas laws that relate to cylinder filling/partial pressures and pressure/temperatures relations etc. The second lesson covers blending equipment. Equipment such as storage cylinders, compressors, blending panel’s gas analyzers, booster pumps etc. We will cover the simple set up procedures of this equipment and the safe operations of gas blending and the related precautions of using this equipment. At this point we will look at the suitable location for the installation of this equipment. The next lesson is aimed at the actual blending of the gases. You will learn how to get the desired mix by determining how much gas needs to be mixed to achieve the final mix. There will be some simple to follow calculations to achieve this.

The mixing procedures will also be achieved by working through simple flowcharts and mixing tables. In the last Nitrox Blender lesson we address potential problems when working with pure Oxygen and other high-pressure gases, especially during the filling process. So in this lesson we introduce you to some safety procedures and precautions of mixing such gases.

After the next section, which is the practical workshop for Nitrox Blending, if you are then intending to do the Mixed Gas Blender module, you will complete an additional theory lesson. In this lesson we take a look at Helium, a third component of Trimix. Helium breathed at depth has its own effects and problems towards the diver and at this part of the lesson we look at these issues. When Helium is mixed with air it is called Heliair and when it is mixed with pure oxygen the mix is known as Heliox. By adding Nitrogen to the mix we get Trimix. All these definitions are now covered in this lesson. The mixing procedures and safety precautions differ from the Nitrox blending so these issues are now covered.

Practical Lessons:

There are two different workshops depend on which course or courses you are attending. The workshops are for either, Nitrox or Mixed Gas blending, or both.

On completion of the course theory modules, you will then complete a blending workshop practical, where you will put all of this theory into practice. In this practical workshop you will get the chance to blend a variety of different mixes depending on which blending workshop you are undertaking. Either way, you will be expected to check the cylinders prior to blending, calculate the required gas or gases to achieve the specific mix using both tables and computer software ensure the correct labeling and documentation for the blended gas.

On successful completion of the course or courses you will be certified as a BSAC Gas Blender for that course

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