Thinking of becoming a gas blender or want to know more about gas blending? Then this book is for you.

From the basic formulas for EANx blending, to Tri-Mix and Helair blending.

This is an excellent must have book for any gas blender, Technical diver or person interested in technical diving. Whether you intend to blend gas or not. Even people that are already gas blenders will find great value from the tips and advice in this book. Alternatively, a new way of explaining things might just be what is needed to help you understand how gas blending works.

The book starts off with an explanation and look at the gasses you will use for deep diving and decompression such as Enriched Air, Tri-Mix, Heliox, Helair, in addition to looking at narcosis, CO2 and CO poisoning and ICDS.

Gas blending is covered, with examples from the basic formulas for enriched air blending to Tri-Mix and Helair that includes topping off a mix, changing a blend, blending with impure helium (helium that has oxygen mixed in it), to formulas on working out the actual breathing mix in a rebreather loop at any depth at any PPO2, to what would be the appropriate mix to bailout to at any depth.

As a diver, by understanding how a blend will change when it is topped off with air or another gas, can allow you to plan your diving better and reuse gasses for other dives instead of it being drained down and wasted.

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In addition is included charts for filling:

Nitrox Mixes for

22 to 50% in 1% increments, 50 to 95% in 5% increments
100 to 4000 psi in 100 psi increments and
20 to 300 bar in 20 bar increments

Helair Mixes for

1/95: 2/90: 3/85: 4/80: 5/75: 6/70: 7/65: 8/60: 9/55: 10/50: 11/45 12/40: 13/35: 15/30: 16/25: 17/20: 18/15: 19/10: 20/5
250 to 3500 psi in 250 psi increments and 20 to 320 bar in 20 bar increments.

Tri-mix Mixes for

8/80: 9/75: 10/65: 10/80: 12/55: 12/75: 13/70: 14/44: 14/65: 16/55: 18/35: 18/40: 20/40: 20/35: 24/30: 32/20: 40/20: 50/20: 60/20
250 to 3500 psi in 250 psi increments and 20 to 300 bar in 20 bar increments.

EAD (Equivalent air depth) charts for

Mixes 22 to 40% in 1% increments, 40 to 60% in 5% increments.
40 To 180 feet in 5 feet increments. 15 to 30 meters in 1 meter increments.
32 to 56 meters in 2 meter increments.

END (Equivalent narcotic depth) and best gas chart for
Feet:

Best gas for PPO2 1; 1.3; 1.4; 1.5; 1.6 Best gas for END of 100 feet @ PPO2 1; 1.3; 1.4; 1,6
Best Gas for END of 130 feet @ PPO2 1; 1.3; 1.4; 1,6
Depths covered 60 to 220 feet in 10 feet increments, 240 to 300 feet in 20 feet increments,
330, 350 370, 400, 425, 440, 460, 480, 500 feet.

Meters:

Best gas for PPO2 1; 1.3; 1.4; 1.5; 1.6 Best gas for END of 30 meters @ PPO2 1; 1.3; 1.4; 1,6
Best gas for END of 39 meters @ PPO2 1; 1.3; 1.4; 1,6 Depths covered 18 to 66 meters in 3 meter increments, 72, 78, 84, 90, 100, 106, 112, 121, 129, 133, 139, 145, 152 meters.

Blending gas in ways you did not know you could do.

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