G size cylinders

koputai

Come on folks, you don't really need to be a certified gas blender to decant O2 from a big
tank to a little one. There's no mixing involved, just simple decanting, hardly rocket surgery.
Hands up those who have a copy of one of Vance Harlow's books..... shame on you.
Pots, kettles, and dark colours come to mind.

Cheers,
Jason.

bendomatic

i don't expect him to have a ticket but the gumption to do some reading without the internet spoon feeding is good start. i would be a hypocrite if i did expect that he have the ticket cos MHD certainly doesn't but he sure can teach himself. me i'm not so clever so i paid someone to find out. silly me. :-)

rachel

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why deal with idiots on the net when you have to spend all day dealing with them at work.

kieranu

Why pay $50+ for the reading if you can get the info here for free. He did have the gumption to ask here. I doubt Harlowe's books are the things you find in the local library.

DeepBlueInnovation

Because it comes down to the old chestnut "you don't know what you don't know". Why go through a trimix course, after all "it's just another gas" as someone once told me? The answer is because there is a lot more you need to know about handling, procedures, decompression so that you and the people you dive with are safe.

So why worry about doing a gas blender's course if you are "just decanting"? Well, one reason would be that if you crack the 02 cylinder wide open with the whip connected, have a little bit of carbon residue in the line there is a significant risk of either a large or small 02 fire. The impact of a large 02 fire should be clear to all. The impact of a small fire is a lot more subtle - there are some pretty nasty gases that will end up in your breathing mix if those Viton o-rings start to burn; and no, you won't necessarily know it has happened.

Those people who "aren't so helpful" are perhaps the ones who actually have your best interests at heart.

kieranu

I think it goes back to the motivation behind the OP and possibly they could have phrased the question better or not, i.e. do they want to know how much gas they can get out of the G unboosted as a couple of people gave a useful response to in terms of a spreadsheet and the formula used as the basis so they can plan the amount of oxygen they need to bring in which case the points Ben and others raise are moot, and/or do they actually plan to decant the oxygen themself in which case they become very relevant. Again, for the points Ben raises a course probably isn't entirely necessary, but at least reading something along the lines of the Oxygen Hacker's Companion in lieu is.

For that matter, I don't see how decompression rates are related to gas blending or decanting per se, particularly in the case of pure oxygen - procedures for gas use while diving in terms of MOD1, MOD2, MOD3, etc yes but gas blending no.

koputai

The guy asked a simple question about gas numbers.
I looked at his profile. He owns an Evo, and has time on Mk15.x.
I know there are two Mk15.5's in Cairns/Port Douglas, and the guys have been diving them for about 10 years.
I went out on a limb and thought, hey, this guy has most likely handled a bit of O2 in his time, he just wants a quick estimate of whether one G is enough for his trip without a booster. I don't think the info or tools I gave him make me complicit in an endeavour to undermine society as we know it.
I thought we were all here to share info and give each other a bit of a hand if need be.

Jason.

DeepBlueInnovation

I am all for sharing information and am well aware that a person can have all the required knowledge through means other than agencies. That said, when the initial question indicates that the person does not have a solid grasp of the fundamentals (this is not a personal dig at you Ross) then it is not unreasonable to point out that perhaps further learning is required.

For people who aren't prepared to pay for a gas blender course then at the very least read a book like the oxyhacker's' companion from Airspeed Press.

Cheers,

Ben.

opimoby

Thank you to all.... I have trained on the SM1600 but they where owned by another person and to my knowlege kept in moth balls for most of that time. I got to dive the units a couple of times after the course but thats about it. Those moth ball units are now sold. I just finished my Evo cross over with Bazza in Sydney so it is still a steep learning curve for me..I am planning to do more courses but am taking things nice and slow and working within my limitations in regard to my experience base. I have a trip coming up on Undersea Explorer soon and I was just pondering how many G cylinders to take as I do not have a booster as yet. Thanks to Jason and others who have been helpful and to those who have been critical I have taken your comments on board and will treat them as positive motivation to learn more..thanks
Ross

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If you build it...they will come..

Rust Bucket

Well said! If he owns a Evo, one must assume he has done his nitrox course so should know the fundamentals of handling O2.

I thought we are all here as like minded individuals to discuss maters on a "forum".

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"The oceans breathed a life into me that I could have never conjured up on my own, and I will forever be in its debt. The secrets I have, were given to me because I went alone, and in the silence of myself I could hear them. It has been said that the only exploration of value is of ones self. If that is true, then I have had no better teacher in life than the ocean" - Carlos Eyles-