Future plans for doubles and lots of questions

[neophyte]

http://www.diveriteexpress.com/gas/steel.shtml#capacity

My understanding is that LP104s and HP130s are the same/very similar tanks, in the same way that LP95s and HP119s are. The new, HP tanks are produced under a specific exemption from the DOT allowing them to have a much higher rated pressure than the old LP tanks did.

The above link displays a handy little chart showing the capacities of several popular steel tanks at different possible pressures.

In some places (e.g. cave country) you will have no problem finding an LDS that will fill an LP tank way above its rated pressure, so that your 104s will hold 130cf or more.

Where I live, I have yet to find a shop that's willing to go that much over rated pressure, that's why I bought a new 119 instead of a used 95. As stated above, unless you're getting some kind of excellent deal on 104s, you'd probably be better off with the 130s (all other things being equal) just for the added flexibility.

That's my understanding of a subject that I know confuses lots of new divers, and me too for awhile. If I've stated anything incorrectly I would, of course, love to be corrected.

YMMV and good luck,

Adam

Edited to correct a misplaced apostrophe. Ooh I hate them!

 

[ianr33]

http://www.diveriteexpress.com/gas/steel.shtml#capacity

In some places (e.g. cave country) you will have no problem finding an LDS that will fill an LP tank way above it's rated pressure, so that your 104s will hold 130cf or more.

Adam

You mean like this?

 

[neophyte]

Oh that makes me jealous. Someday...

 

[Lukiedukie]

You mean like this?

WOW. No one around here will even fill HP to their limit. It is 3000 and thats it. I now know what a cave fill is. Thanks learning new things everytime I come back here

 

[PerroneFord]

WOW. No one around here will even fill HP to their limit. It is 3000 and thats it. I now know what a cave fill is. Thanks learning new things everytime I come back here

It's a different world here in cave country! Sometimes I feel like the luckiest OW diver in the world. And then I remember that I can't dive in the dang caves...


Yet.

 

[loosebits]

You know how a cave diver knows when to turn the dive?

When his tanks are full.... seriously, my 104's don't have their + rating (they didn't fail the + rating test, the previous owner just didn't want to pay for it) so diving thirds on a typical 3600 psi fill means turn at rated pressure, 2400 psi.

 

[Scuba_Steve]

You know how a cave diver knows when to turn the dive?

When his tanks are full....

Now that's funny dude.

 

[limeyx]

You mean like this?

Is that before or after the dive ?

 

[cool_hardware52]

You know how a cave diver knows when to turn the dive?

When his tanks are full.... seriously, my 104's don't have their + rating (they didn't fail the + rating test, the previous owner just didn't want to pay for it) so diving thirds on a typical 3600 psi fill means turn at rated pressure, 2400 psi.

Put another way.

Cave fill, definition: When the turn pressure is stamped on the tank.

I'm sorry I can't recall where I first heard this.


Tobin

 

[loosebits]

Put another way.

Cave fill, definition: When the turn pressure is stamped on the tank.

I'm sorry I can't recall where I first heard this.


Tobin

I'll have to remember that one