View Full Version : Neutrally Buoyant Aluminum 80 Tank

06-12-2009, 10:05
i have been looking at tanks now for about 3 months going back and forth looking at the steel tanks and the Aluminum ones. i just seen the Neutrally Buoyant Aluminum tank. i know the biggest down fall of using a normal aluminum tank is that you need to add a few extra pounds. but with this one you dont need to add the extra weight and you can fill it to 3300 psi.
now my question is is there a down fall by getting this tank over a steel one?

06-12-2009, 10:44
Buoyancy is all about weight:displacement. To make something less buoyant you either have to increase the weight or decrease how much water it displaces. I suspect the neutrally buoyant AL80 is heavier but around the same size.

Look at the specs for the tank to confirm. This means you'll have a heavier tank on land. Heavier when lugging it to the shop, boat, etc. Getting out of surf on a shore dive could be more difficult.

The upside is that aluminum is easier to maintain in salt water than steel. That is, there is less chance of oxidization.

As a fresh water diver, I'd just get a HP steel.

06-12-2009, 11:29
I have this tank, got it for christmas last year. I'll dive this one, next dive strap on a steel 100 and not change anything else, for that reason I really like it. As the lone reviewer stated on the ST site, you really have to stay on top of fills. Even when I tell people it is HP, they only fill it to 3000psi. Other than that pain in the butt, I have no complaints.

06-12-2009, 14:26
I believe there is a vendor that provides 6# steel blanks that can fit inside a standard AL tank boot thus making it a neutral buoyant tank. That way you don't have the issues of the HP tanks. Can't recall the details but a search may turn something up.

06-12-2009, 23:14
Here is what you add to your tank boot to make an AL 80 neutral. I had bought one and then made a copy later on.NEW PRODUCT Neutrl Buoyancy Weight 4 Scuba Diving Tanks - eBay (item 190299139057 end time Jul-04-09 17:33:18 PDT) (http://cgi.ebay.com/NEW-PRODUCT-Neutrl-Buoyancy-Weight-4-Scuba-Diving-Tanks_W0QQitemZ190299139057QQcmdZViewItemQQptZLH_D efaultDomain_0?hash=item2c4eb66bf1&_trksid=p3286.m20.l1116)

06-12-2009, 23:21
Because of the pressure difference between the neutral AL80(3300psi) and standard AL80(3000psi) I'd suggest AL100 which are also neutral but also rated at 3300psi. Even with a 3000psi fill you'll still have more air than either AL80.