100 size tanks?

[Celt]

The AL80 weighs less than a HP steel 100 100 size tanks?

Have only experience with luxfer, I have an aluminium at 35 pounds on land and a 10ltr faber steel at 25 +air 5 pounds, a whopping 5 pound difference. Could be an old aluminium tank.

 

[Celt]

They are the standard tank used across SEA Australia Japan Taiwan where I dive. Some dive centers may have larger tanks available on request but not all. As many places limit dive times an AL 80 is fine. More weight in the tank just means less weights in your inserts or weight belt.

Yep they suit a dive operation where you have a standard tank but my point was that a small steel 10 ltr is so much nicer to dive and lighter to carry on land. is the reason for choosing an aluminium tank for maintenance reasons.

 

[broncobowsher]

...the reason for choosing an aluminium tank for maintenance reasons.

And up front cost.

 

[MrBigfins]

I dive larger tanks when I can simply because I have a higher sac rate. I get 100s when in cozumel because I don't want to be the reason my buddy has to end earlier than required, because I want to enjoy as long as possible on each dive. I'm 6'7 280lbs and smoked for many years (quit once I started diving as it gave me the motivation) and my sac has improved greatly as I progressed and got more comfortable underwater, however it will never match a smaller person. I would prefer to take a larger tank than to try and squeeze every last drop out of an 80, it's simply safer that way

 

[OrcasC205]

At an average consumption of 0.5 cuft/min (see Scubadada's graph above) an 80 cuft tank (70 usable cuft) provides about 140 minutes of gas at the surface. For a one-hour dive that would allow an average depth of 2.33 atmospheres, or 45 ft. This calculation does NOT take into account any reserve in case your buddy needs gas from you. THIS is why many divers would like a larger tank, regardless of the buoyancy characteristics.

The part I bolded is a really important point for those of us that care about calculating Minimum Gas (aka Rock Bottom Gas) for a safe, air-sharing ascent in case of an emergency. Minimum Gas at 100 feet is 42 cuft using the GUE MG calculation, which is 1700 psi on a AL80, leaving only 35 cuft for your bottom time. With an HP100, you get 58 cuft of gas for you bottom time, or 65% more bottom time.

Granted, most people will dive multi-level, but the amount of time you have at deeper depths before you have to ascend to stay above your minimum gas level is vastly different between an AL80 and an HP100.

 

[Bob DBF]

Have only experience with luxfer, I have an aluminium at 35 pounds on land and a 10ltr faber steel at 25 +air 5 pounds, a whopping 5 pound difference. Could be an old aluminium tank.

5# less for the tank and 4# less for the lead (buoyancy difference) makes a large improvement when lugging it to and from the beach on the NorCal coast.

 

[ScubaBadger32]

devils throat

a what?

 

[tursiops]

a what?

The Legendary Devil’s Throat Cozumel | Everything you need to know

Devil’s Throat Cozumel is an advanced dive, and a right of passage for many divers. Read on to find out all about this epic dive.

blog.scubatony.com

 

[ggunn]

a what?

The Devil's Throat is a deep dive in the Punta Sur section of Cozumel's barrier reef. The throat itself is a vertical swimthrough that starts at the top of the reef and has an exit point at 100'+ FSW.

 

[ScubaBadger32]

The Devil's Throat is a deep dive in the Punta Sur section of Cozumel's barrier reef. The throat itself is a vertical swimthrough that starts at the top of the reef and has an exit point at 100'+ FSW.

woah, new bucket list!