Steel vs Alum. tanks

[Soggy]

DIR does not always imply doubles?

If you are in an overhead environment (i.e. mandatory deco or hard overhead), you need doubles, end of story. So, for a 150ft or 180ft dive, it's a no brainer---you need doubles. For recreational profiles, you just need enough gas to get you and a buddy to the surface and still have enough to do a reasonable dive. That might mean doubles, it might mean large singles, depending on depth. Once you start taking a real hard look at rock botto gas planning for you and a buddy in depths around 100ft, you'll find that an Al80, for example, is not enough gas to do a dive of any reasonable duration. That's part of why you see a lot of recreational divers using doubles for anything even remotely deep.

 

[mcrae]

If you are doing dives past 100 ft you really should have doubles. If you are doing dives as deep as you say and are not using doubles and a responsible buddy or team I suggest you listen to Soggy's advice and get equiped properly.

You can double up AL80's and get your self a SS backplate, and depending on your exposure protection, you will not have to wear much weight. That is the real advantage to steel, especially LP steel is that they stay negative when almost MT.

I would also suggest you look into some additional training.

Gary