Paul Calman wrote:
> I already have a 40 ft^2 oxy cyl I can use for compressed air for tire
> filling. I've been reading sites about CO2 tanks, they hold 800 Psi, and and
> a scuba/air tank hold 2-3000 Psi.
> Does anyone know for sure how same-size tanks compare in fill-up counts?
>

Not sure, but I'm a scuba diver, and own a few tanks. Here's my take on
it, though:

I'm not so sure I want 3000 lbs of compressed ANYTHING potentially
bouncing around while offroading. 800 lbs "secured" makes me feel more
secure than 3000 lbs "secured".

You need an expensive regulator to bring that 3000 lbs to a usable 0-120
LB range.

But the big kicker is:


I need to present my C-card in order to fill my scuba tanks. No dive
shop as near as my local welding shop. No c-card needed at my local
welding shop.

If I had a Dive Shop closer than the welding shop, the situation might
tip the other way.

 

Paul Calman wrote:
> I already have a 40 ft^2 oxy cyl I can use for compressed air for tire
> filling. I've been reading sites about CO2 tanks, they hold 800 Psi, and and
> a scuba/air tank hold 2-3000 Psi.
> Does anyone know for sure how same-size tanks compare in fill-up counts?
>

Not sure, but I'm a scuba diver, and own a few tanks. Here's my take on
it, though:

I'm not so sure I want 3000 lbs of compressed ANYTHING potentially
bouncing around while offroading. 800 lbs "secured" makes me feel more
secure than 3000 lbs "secured".

You need an expensive regulator to bring that 3000 lbs to a usable 0-120
LB range.

But the big kicker is:


I need to present my C-card in order to fill my scuba tanks. No dive
shop as near as my local welding shop. No c-card needed at my local
welding shop.

If I had a Dive Shop closer than the welding shop, the situation might
tip the other way.

 

Paul Calman wrote:

> That's where it gets wierd. one company is saying they get 84 Ft^2 out of a
> cylinder the same size as a 40 Ft^2 O2 cyl, because it's CO2 in a liquid
> state.

Heh. Forgot about that. Absolutely right. A lot more gas is generated by
evaporating C02 than you can get out of a scuba tank.

Go with the C02, or nitrogen.

Just don't lay the tank on its' side while filling your tires.

> That's what I'm trying to figure, is a tank under 2000 PSI going to actually
> deliver only 40 Ft^2 when an 800 Psi tank of CO2 will deliver 84 ? The
> sites of CO2 tank makers only compare with a 150 Psi air tank, not a scuba
> cyl.
>

 

Paul Calman wrote:

> That's where it gets wierd. one company is saying they get 84 Ft^2 out of a
> cylinder the same size as a 40 Ft^2 O2 cyl, because it's CO2 in a liquid
> state.

Heh. Forgot about that. Absolutely right. A lot more gas is generated by
evaporating C02 than you can get out of a scuba tank.

Go with the C02, or nitrogen.

Just don't lay the tank on its' side while filling your tires.

> That's what I'm trying to figure, is a tank under 2000 PSI going to actually
> deliver only 40 Ft^2 when an 800 Psi tank of CO2 will deliver 84 ? The
> sites of CO2 tank makers only compare with a 150 Psi air tank, not a scuba
> cyl.
>

 

Paul Calman wrote:

> That's where it gets wierd. one company is saying they get 84 Ft^2 out of a
> cylinder the same size as a 40 Ft^2 O2 cyl, because it's CO2 in a liquid
> state.

Heh. Forgot about that. Absolutely right. A lot more gas is generated by
evaporating C02 than you can get out of a scuba tank.

Go with the C02, or nitrogen.

Just don't lay the tank on its' side while filling your tires.

> That's what I'm trying to figure, is a tank under 2000 PSI going to actually
> deliver only 40 Ft^2 when an 800 Psi tank of CO2 will deliver 84 ? The
> sites of CO2 tank makers only compare with a 150 Psi air tank, not a scuba
> cyl.
>

 

I use CO2. I have 10 lb tanks I rotate out. Cheap to fill and safely stored
in my HD rack mounted inside the XJ. I have no real fear of it being inside
as long as it is secure. I love the thing. Once in a while I grab it and use
it to power my Nail gun too.
KH

"Cal Wheeler" <cal@whee.ler> wrote in message
news:br015t$un7$1@pita.alt.net...
> Paul Calman wrote:
>
> > That's where it gets wierd. one company is saying they get 84 Ft^2 out
of a
> > cylinder the same size as a 40 Ft^2 O2 cyl, because it's CO2 in a liquid
> > state.
>
> Heh. Forgot about that. Absolutely right. A lot more gas is generated by
> evaporating C02 than you can get out of a scuba tank.
>
> Go with the C02, or nitrogen.
>
> Just don't lay the tank on its' side while filling your tires.
>
> > That's what I'm trying to figure, is a tank under 2000 PSI going to
actually
> > deliver only 40 Ft^2 when an 800 Psi tank of CO2 will deliver 84 ? The
> > sites of CO2 tank makers only compare with a 150 Psi air tank, not a
scuba
> > cyl.
> >
>

 

I use CO2. I have 10 lb tanks I rotate out. Cheap to fill and safely stored
in my HD rack mounted inside the XJ. I have no real fear of it being inside
as long as it is secure. I love the thing. Once in a while I grab it and use
it to power my Nail gun too.
KH

"Cal Wheeler" <cal@whee.ler> wrote in message
news:br015t$un7$1@pita.alt.net...
> Paul Calman wrote:
>
> > That's where it gets wierd. one company is saying they get 84 Ft^2 out
of a
> > cylinder the same size as a 40 Ft^2 O2 cyl, because it's CO2 in a liquid
> > state.
>
> Heh. Forgot about that. Absolutely right. A lot more gas is generated by
> evaporating C02 than you can get out of a scuba tank.
>
> Go with the C02, or nitrogen.
>
> Just don't lay the tank on its' side while filling your tires.
>
> > That's what I'm trying to figure, is a tank under 2000 PSI going to
actually
> > deliver only 40 Ft^2 when an 800 Psi tank of CO2 will deliver 84 ? The
> > sites of CO2 tank makers only compare with a 150 Psi air tank, not a
scuba
> > cyl.
> >
>

 

I use CO2. I have 10 lb tanks I rotate out. Cheap to fill and safely stored
in my HD rack mounted inside the XJ. I have no real fear of it being inside
as long as it is secure. I love the thing. Once in a while I grab it and use
it to power my Nail gun too.
KH

"Cal Wheeler" <cal@whee.ler> wrote in message
news:br015t$un7$1@pita.alt.net...
> Paul Calman wrote:
>
> > That's where it gets wierd. one company is saying they get 84 Ft^2 out
of a
> > cylinder the same size as a 40 Ft^2 O2 cyl, because it's CO2 in a liquid
> > state.
>
> Heh. Forgot about that. Absolutely right. A lot more gas is generated by
> evaporating C02 than you can get out of a scuba tank.
>
> Go with the C02, or nitrogen.
>
> Just don't lay the tank on its' side while filling your tires.
>
> > That's what I'm trying to figure, is a tank under 2000 PSI going to
actually
> > deliver only 40 Ft^2 when an 800 Psi tank of CO2 will deliver 84 ? The
> > sites of CO2 tank makers only compare with a 150 Psi air tank, not a
scuba
> > cyl.
> >
>

 

There is a notice at the business where I exchange my tanks that says that
no compressed gas should ever be transported inside a vehicle. If your CO2
tank should leak from the valve it could fill the vehicle's interior with
CO2 and displace all the oxygen, which you need. I don't know how likely
this is...

Earle

"Kevin in San Diego" <kevin_hedstrom@yahoo.com> wrote in message
news:2IPAb.29647$Bk1.25862@fed1read05...
> I use CO2. I have 10 lb tanks I rotate out. Cheap to fill and safely
stored
> in my HD rack mounted inside the XJ. I have no real fear of it being
inside
> as long as it is secure. I love the thing. Once in a while I grab it and
use
> it to power my Nail gun too.
> KH
>
> "Cal Wheeler" <cal@whee.ler> wrote in message
> news:br015t$un7$1@pita.alt.net...
> > Paul Calman wrote:
> >
> > > That's where it gets wierd. one company is saying they get 84 Ft^2 out
> of a
> > > cylinder the same size as a 40 Ft^2 O2 cyl, because it's CO2 in a
liquid
> > > state.
> >
> > Heh. Forgot about that. Absolutely right. A lot more gas is generated by
> > evaporating C02 than you can get out of a scuba tank.
> >
> > Go with the C02, or nitrogen.
> >
> > Just don't lay the tank on its' side while filling your tires.
> >
> > > That's what I'm trying to figure, is a tank under 2000 PSI going to
> actually
> > > deliver only 40 Ft^2 when an 800 Psi tank of CO2 will deliver 84 ?
The
> > > sites of CO2 tank makers only compare with a 150 Psi air tank, not a
> scuba
> > > cyl.
> > >
> >
>
>

 

There is a notice at the business where I exchange my tanks that says that
no compressed gas should ever be transported inside a vehicle. If your CO2
tank should leak from the valve it could fill the vehicle's interior with
CO2 and displace all the oxygen, which you need. I don't know how likely
this is...

Earle

"Kevin in San Diego" <kevin_hedstrom@yahoo.com> wrote in message
news:2IPAb.29647$Bk1.25862@fed1read05...
> I use CO2. I have 10 lb tanks I rotate out. Cheap to fill and safely
stored
> in my HD rack mounted inside the XJ. I have no real fear of it being
inside
> as long as it is secure. I love the thing. Once in a while I grab it and
use
> it to power my Nail gun too.
> KH
>
> "Cal Wheeler" <cal@whee.ler> wrote in message
> news:br015t$un7$1@pita.alt.net...
> > Paul Calman wrote:
> >
> > > That's where it gets wierd. one company is saying they get 84 Ft^2 out
> of a
> > > cylinder the same size as a 40 Ft^2 O2 cyl, because it's CO2 in a
liquid
> > > state.
> >
> > Heh. Forgot about that. Absolutely right. A lot more gas is generated by
> > evaporating C02 than you can get out of a scuba tank.
> >
> > Go with the C02, or nitrogen.
> >
> > Just don't lay the tank on its' side while filling your tires.
> >
> > > That's what I'm trying to figure, is a tank under 2000 PSI going to
> actually
> > > deliver only 40 Ft^2 when an 800 Psi tank of CO2 will deliver 84 ?
The
> > > sites of CO2 tank makers only compare with a 150 Psi air tank, not a
> scuba
> > > cyl.
> > >
> >
>
>