How much weight to add?

[texdiveguy]

I'm also going to throw this out there--if it's a 119, then it isn't technically a "HP" tank. It's either an E8-119 or an X8-119 made under the DOT exemption, but it isn't an HP tank.

Very interesting,,,hmmmmmmm. And I do like your picture,,,,is it easier diving with 2 sets of legs.....

 

[SparticleBrane]

If only I got a dollar for every time someone asked me that...
As to the the HP thing--they're not 3180/3498psi, so yes they're not HP. Just a technicality, nothing else.

 

[texdiveguy]

If only I got a dollar for every time someone asked me that...
As to the the HP thing--they're not 3180/3498psi, so yes they're not HP. Just a technicality, nothing else.

 

[Empty V]

Thanks for the responses everyone. I've got a beach dive tomorrow morning before I go out on a boat Sunday. Tomorrow sounds like it will be a good indication of where I need to be. So the X8-119 isn't a high pressure tank? So what makes a tank a HP, if it's not 3442 then what is it? It's weight characteristics are -10.9 full and -2 empty. Before I was diving LP 72's and I'm also diving west coast wet.

Billy

 

[markfm]

Here:
http://markfm.dynalias.org/Weighting.pdf

 

[spectrum]

So what makes a tank a HP, if it's not 3442 then what is it?

A HP cylinder I believe is defined as having a working pressure of 3500 PSI or greater.

A HP cylinder requires a DIN connection.

The 3442 pseudo HP cylinders skirt the DIN requirement by staying a few atmospheres below 3500 PSI. Hence the convertible valve.

That's my understanding. We dive E7-80s as well as the earlier PST 3500 PCI 100 CF cylinders. Our regulators have DIN connections.

Pete

 

[webhead]

No sure if this is water or gas I'm pouring on the fire but....

Fact - My Steel 120's are stamped 3500+ (overfill till 1st hydro??) with the 120 and other serial numbers and such like that. That tells me that if you fill the tank to 3500 psi, the gas that is put in there is equivalent to 120 cu ft of gas. And they have the deep threaded DIN valves.

Probably talking apples and oranges but that's what I got. And if someone is interested, filled to 3500 psi with air, they weigh 47 lbs out of the water.

 

[Empty V]

Well I added 6lbs and I felt over weighted. I think 3lbs would have been perfect, is this unusual? My wetsuit has about 30 dives on it and very few of them have been deeper than 60ft, so it's not very compressed.

 

[limeyx]

Well I added 6lbs and I felt over weighted. I think 3lbs would have been perfect, is this unusual? My wetsuit has about 30 dives on it and very few of them have been deeper than 60ft, so it's not very compressed.

I add 4 (but have not been diving fresh water since my pool dives

The only way to tell, is get in the ocean, dive.

At the end of the dive, surface, and drain the tank to 300 psi.
Then, in *shallow* water, and *with a buddy* dump all gas from the BC and go down to 10 or 15 feet (do not add gas to the BC).

Remove weight from the belt until you can hover at 10 feet.

This should work for any recreational setup.

It's vital that you have a buddy with you as 300psi is not much gas and you need someone ready to help you if your reg starts breathing hard.

Also, what happened to the '130' tank I thought Ken had convinced you to get ?

 

[Empty V]

I add 4 (but have not been diving fresh water since my pool dives

The only way to tell, is get in the ocean, dive.

At the end of the dive, surface, and drain the tank to 300 psi.
Then, in *shallow* water, and *with a buddy* dump all gas from the BC and go down to 10 or 15 feet (do not add gas to the BC).

Remove weight from the belt until you can hover at 10 feet.

This should work for any recreational setup.

It's vital that you have a buddy with you as 300psi is not much gas and you need someone ready to help you if your reg starts breathing hard.

Also, what happened to the '130' tank I thought Ken had convinced you to get ?

I was weighting myself for a bp/w I was borrowing, now I need to jump back in the pool and try it all over again. Yay

Well, the 119 is the same size as an LP95 which is the limit for doubles on the wing I might get if I do go for a bp/w. Other than that, price and 11cf(which to me doesn't seem like a whole lot more when you're dealing with a tank that big), I dont see too much of a difference between the two. I am very very very happy and excited with my new tank purchase!