Gas Cost for MOD2/3

Mark Wan

Does anyone who has done either MOD2 or MOD3 on an Inspiration remember how many litres of O2 and helium they used during the course itself?

Just trying to figure out how much to budget, on top of the course cost, for things like lime and gas.

Thanks
mark

__________________
newbie inspo vision diver

Ivon

Hi Mark, should be no more than about £8-10 a fill for mix.

Ivon

decoweenie

On the average, about 2L per minute of both O2 and diluent is a good estimate.

However, the total amount of gas also depend how many skill sets your instructor is going to pull on you as well. If he wants you to do a lot of diluent flush or free-flow exercises, it will waste more.

Regardless, just calculate 1 complete fill of O2 and trimix per dive of on-board gas will be the worst case. And 1 for bail-out stages per 2 day (1 or 2 dives).

__________________
"...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..."

- Rebreather World PM

Ivon

Forgot about bailout

Dutchy

You must have an incredably inexpensive course to be considering the cost of gases My guess is that you'll spend more on fuel getting there....

__________________
= This post is environmentally friendly. It is composed of 100% recycled electrons only. =

Mark Wan

I've never dived (or bought) mix, so not sure how much it would cost. Just wanted to check prices before I committed myself to a course

thanks for all the replies.
mark

__________________
newbie inspo vision diver

Mark Chase

On a CCR the gas to get the car to and from the dive is far more significant than the Trimix used.

Doing two 60-70m dives Mon and Tus, should cost me 150 bar out of a 3ltr of trimix using 15/65 so about £15 in Trimix £14 in lime and £6 in 02

OC it would be more lke £320 for two 15ltr twin sets and two 10ltr stages of 32 and 80.

Aint CCR great

ATB

Mark Chase

__________________
See my "Doing It Chasey" video where I'm locked into a padded room, naked, with two ball bearings and within an Hour, I manage to lose one and break the other!!!

Kevin Juergensen 16/11/08
[/quote]

Sue

Hi Mark

I'm about to start CCR trimix training.

Depending on the mixes and skills (in which you'll use or not all inboard and offboard gas) your instructor wants, it's easy to do the calculations:

Here's an example of my case, for one dive:

Inboard gas: O2 and Tx 15/50
Offboard gas: Tx 20/40 and EAN 50

Cylinders:
Inboard: 3lt O2
Inboard: 3 lt Tx 15/50
Offboard: 7lt Tx 20/40
Offboard: 7 lt EAN 50

Gas needed:

Tx 15/50: 100 bar He + 11.4 bar O2 + air to 200 bar
Tx 20/40: 80 bar He + 19 bar O2 + air to 200 bar
EAN 50: 74 bar O2 + air to 200 bar

Calculations:
Inboard O2: 3 x 200 = 600 lt O2
Inboard Tx: (3 x 100)= 300 lt He + (3 x 11.4)= 34.2 lt O2
Offboard Tx (7 x 80)= 560 lt He + (7 x 19)=133 lt O2
Offboard EAN: (7 x 74)=518 lt O2

Amount of gas for first dive

O2: 1285 lt
He: 860 lt

Plus: sodalime

If you know the mix you'll use and size of cylinders, you can do your own calculations. For the next dives, the amount of gases will depend of the amount used in the previous one.

Hope it helps

Sue

vulcan

I don't know if you're already comitted to this yet, but if it helps I did Mod 2 last week, well the mix dives part anyway.

I had:
1 x 2ltr of 10/50
2 x 2ltr of 100% o2
1 x 10ltr of 20/20
1 x 10ltr of 60% o2

All cylinders were filled from empty apart from the 2lt o2's.

I used one one cannister full of lime over 2 days.

Total cost of gas was £58

Hope that helps.

__________________
"Blessed are they who learn from their mistakes. For they shall make, if not necessarily fewer of them, different and more interesting ones."

Martin

Mikel-Deko

Hi.
I don't remember how many litres of gas we used in our mod 3 course,
but i can tell you that we spend lot of Bierre litres.

Regards.
Mikel-Bierre-Deko