Any book recommendation for equipment and gas blender?

[sara!]

Hello divers.
Greetings from the tropic.

I would like to expand my knowledge on two things:
- Equipment, hoping to be able to understand better on how they work.
- Gas blender, planning to take gas blender course in some points.

Any books recommendation for me to read on my leisure time before I enrol on any courses?
Just for reference, I am PADI recreational diver. So 'equipment' here would be things like regulators and BCDs.

Thanks in advance for any advice!
sara!

 

[Knotted Lion]

Check out airspeedpress.com

 

[NAM001]

+1 for airspeed press,,,,,,,,, the oxygen hackers handbook

 

[Kevrumbo]

Same recommendation -The Oxygen Hacker's Handbook- good equipment & blending station set-up examples.

The DSAT/PADI Gas Blender Workbook is unremarkably fair as far as textbooks go.

Here's some basic partial pressure blending recipes for some standard gas mixes in metric that are good to know:

Starting from an empty tank or twinset of tanks:

Nitrox 50 (add 37% O2):
For every 100 bar of Eanx50 deco mix, you need 37 bar of pure O2 and top off the remainder with [hyper-filtered clean] Air;

Nitrox 32 (add 14% O2):
For every 100 bar of Eanx32 mix, you need 14 bar of pure O2 and top off the remainder with Air;

25/25 Triox (add 12% O2 & 25% Helium):
For every 100 bar of 25/25 Triox, you need 12 bar of pure O2, 25 bar of He and top off remainder with Air;

21/35 Trimix (add 9% O2 & 35% Helium):
For every 100 bar of 21/35 Trimix, you need 9 bar of pure O2, 35 bar of He and top off remainder with Air;

18/45 Trimix (add 8% O2 & 45% Helium):
For every 100 bar of 18/45 Trimix, you need 8 bar of pure O2, 45 bar of He and top off remainder with Air;

15/55 Trimix (add 7% O2 & 55% Helium):
For every 100 bar of 15/55 Trimix, you need 7 bar of pure O2, 55 bar of He and top off remainder with Air.

Using a 11L (AL80) cylinder, or set of twin 11L doubles (double AL80's) for a total of 22L, a full tank or set of tanks is 200 bar:
-->Therefore, all you need is 2 times the amount in bar for O2 (& He for Trimix) from above recipes for a particular mixture.

Example)
21/35 Trimix requires blending 9% Oxygen and and 35% Helium; Therefore a full 11L (Al80) cylinder(s) at 200 bar total pressure needs 18 bar of O2 (2 times 9 bar equals 18 bar), and 70 bar of Helium (2 times 35 bar equals 70 bar); and top off remainder to 200 bar with [hyper-filtered clean] Air.​

 

[sara!]

Knotted Lion, KWS, Kevrumbo: thank you so much for your prompt response and helpful reference!
Cheers, sara!

 

[ElGaucho]

Take a look at EnviroDive, the book is a good starting point for gas blending (good price, instant ebook gratification):

Blending Oxygen Enriched Air - EnviroDive

Cheers.

 

[scoobydrew]

google Anton Swanepoel books, he has one called The Art of Gas Blending

 

[Subcooled]

Get Vance Harlows books (Airspeed press). They contain a lot of information.
They are not as colourfull as PADI manuals though.
Maybe it's better that way.

Mixing computations are best done by computer.

 

[bracko]

or smartphone

 

[mathauck0814]

^that. There are so many apps for gas blending. Read the Oxy Hacker book, get some apps and have someone who knows what they're doing coach you through the first few. It isn't rocket science.