Luxfer 4350Psi AL Tank?

[Tamas]

I was just browsing the Luxfer site and noticed that they offer a 4350psi service pressure AL 106cuft and 85cuft tanks. (this might old news but it's new to me.)

It has some odd specs, see here : http://www.luxfercylinders.com/products/scuba/specifications/us_imperial.shtml

interesting to see an AL tank with that high of a pressure rating, with almost the same size as a AL80....might be interesting to see one in action -- if you can get it filled, mind you!

maybe the onset of 300bar tanks in NA?

 

[teknitroxdiver]

It's a fiberglas hoop-wrapped tank. So, not your average AL80.

 

[Leadking]

I've sold a few, paintballers seems to be the only ones interested in them. They have a 3 year hydo with a 15 year life, 300 bar 7/8 x 14 valve.

Basicly they are an alum 63 or 80 fiberglass wrapped.

Lee
www.seapearls.com

 

[Hoosier]

I was just browsing the Luxfer site and noticed that they offer a 4350psi service pressure AL 106cuft and 85cuft tanks. (this might old news but it's new to me.)

It has some odd specs, see here : http://www.luxfercylinders.com/products/scuba/specifications/us_imperial.shtml

interesting to see an AL tank with that high of a pressure rating, with almost the same size as a AL80....might be interesting to see one in action -- if you can get it filled, mind you!

maybe the onset of 300bar tanks in NA?

As I read somewhere, there is a steel tank on the pressure rate.....

 

[KOMPRESSOR]

Most tanks used for OW-courses over here are 300 bar/4400 psi 10 liter steel tanks, in combination with neoprene drysuits. Nothing to it, really. The drawback is that one cannot get full use of the air above 250-260 bar. One benefit is weight, which shaves off a lot of lead. Filling? Not an issue. Most compressors here handle 300 bar.

 

[Nostromo]

The drawback is that one cannot get full use of the air above 250-260 bar.

I'm not sure I understand that.

e.a.e.

 

[KOMPRESSOR]

I'm not sure I understand that.

e.a.e.

You have to consider the compressability of air if you go beyond 250 bar. At 300 bar you have an average loss of about 10% "effective" breathing air compared to tank volume X pressure.

 

[Hoosier]

You have to consider the compressability of air if you go beyond 250 bar. At 300 bar you have an average loss of about 10% "effective" breathing air compared to tank volume X pressure.

I still can't follow. No matter what pressure tanks you are using, the IP is set on the 1st stage, so we can get a constant pressued air. Am I missing something here?:06:

 

[KOMPRESSOR]

I still can't follow. No matter what pressure tanks you are using, the IP is set on the 1st stage, so we can get a constant pressued air. Am I missing something here?:06:

Yes. When you fill a tank beyond 250-260 bar, the pressure rise more than the volume of the air you fill should indicate. Therefore you will not get the full -tank volume X pressure- out of it.

10 liter x 200 bar = 2000 liter
15 liter x 200 bar = 3000 liter

10 liter x 300 bar should therefore be 3000 liter, but it is only about 2700 "effective" liters. The compressability of nitrogen and oxygen differs above 250-260 bar. Therefore you end up with this result.

I have some problems describing this in English and I suppose getting it in Norwegian wouldn't help you much, would it?!

 

[Nostromo]

I still can't follow. No matter what pressure tanks you are using, the IP is set on the 1st stage, so we can get a constant pressued air. Am I missing something here?:06:

I don't get it either... If you lose 10% where does it go?

e.a.e.