all4scuba05
Contributor
a 72cf tank and an 80cf... if you did exactly the sames dive with each tank, how much longer can you dive with the 80cf...is it such a big dif?
whats the difference?
- Thread starter all4scuba05
- Start date
Please register or login
Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
- Ability to post and comment on topics and discussions.
- A Free photo gallery to share your dive photos with the world.
- You can make this box go away
FreeFloat
Contributor
- Messages
- 1,862
- Reaction score
- 3
- # of dives
- 200 - 499
It would depend on your personal breathing rate (surface air consumption rate, or SAC) as well as the depth to which you're diving.....
The difference in volume between a 72 and an 80 is about 10 cubic feet........ (the '72' actually holds closer to 67 cu.ft, and the '80' holds around 77.4, though this can vary slightly depending on the maker of the tank)
So, how long does it take you, personally, to "use up" ~10 cubic feet of air?
The difference in volume between a 72 and an 80 is about 10 cubic feet........ (the '72' actually holds closer to 67 cu.ft, and the '80' holds around 77.4, though this can vary slightly depending on the maker of the tank)
So, how long does it take you, personally, to "use up" ~10 cubic feet of air?
H2Andy
Contributor
yes... also, it would depend how deep your dive is
10 cf is not much of a difference at 80 feet. it'll take you a lot longer to go
through 10 cf at 20 feet
10 cf is not much of a difference at 80 feet. it'll take you a lot longer to go
through 10 cf at 20 feet
OP
all4scuba05
Contributor
around here i've only been diving 40-50 max...so it seems that like you said, big difference...considerably more dive time with 80
teknitroxdiver
Contributor
Well, I figured it up using an excel spreadsheet from the 'SAC Rate' thread, and with my SAC rate, it would be a difference of 8 minutes at 50 feet....not much.all4scuba05:
Wristshot
Contributor
Since the question was
The answer would be that you would last about 10% longer with the larger tank.
On a deep dive you might extend your bottom time a small amount (about 10%) and on a shallower dive you might extend your bottom time a bit more (like about 10%). Only you can decide whether that is a "significant difference".
Of course when you consider the fact that a 3 minute safety stop would use a larger percentage of the smaller tank then . . . .
W
all4scuba05:
The answer would be that you would last about 10% longer with the larger tank.
On a deep dive you might extend your bottom time a small amount (about 10%) and on a shallower dive you might extend your bottom time a bit more (like about 10%). Only you can decide whether that is a "significant difference".
Of course when you consider the fact that a 3 minute safety stop would use a larger percentage of the smaller tank then . . . .
W
H2Andy
Contributor
Wristshot:
oooh... i like that answer
er...
that's what i was trying to say!
OP
all4scuba05
Contributor
my choice was a 72steel vs an 80 aluminum...with the 80 being $100 more...i've made up my mind...thankyou guys
willydiver
Guest
all4scuba05:
Wow, you must be picking up the steel for around $50? Al80's are selling for around $150. Is the steel 72 used? If so, have it checked out before you buy or have the seller guarantee it will pass the $30-$40 hydro (if it's out, of course...).
WD
Similar threads
