Join DiveBuddy.com

Meet new scuba divers, maintain a virtual dive log, participate in our forum, share underwater photos, research dive sites and more. Members login here.

#1592
How do I calculate my air volume in tank
lerpy - 5/16/2013 8:01 AM
Category: Equipment
Replies: 13

How would I calculate how much air in volume is in my tank. So I have a 150 steel so at max pressure 3400 I should have 150cubic feet, but how do I figure out what I have if my tank is now at 2400psi
#13343
LatitudeAdjustment - 5/16/2013 8:13 AM
I have this formula on my home computer, I’ll look for it tonight.
#4307
caves4me - 5/16/2013 9:38 AM
150/3400= .044 x 2400 = 105.8 cf
#1592
Subscribed
lerpy - 5/16/2013 10:42 AM
Sweet thanks. Want to start learning these things for gas management. Now to figure out my SAC rate.
#4307
caves4me - 5/16/2013 11:15 AM
You’re welcome. That was a quick calculation, when you go through formal training you’ll understand the steps much better. I was puzzled about the rated pressure on your 150. I’ve seen 3500 and 3442 rated pressure cylinders but I never heard of a 3400? I must be slipping!..LOL..
#5774
Agojo - 5/16/2013 11:22 AM
Make sure you go by the manufacture specs. Example a Luxfer AL80 is actually only 77.4 cu ft at 3000psi.
#50619
Subscribed
Greg - 5/16/2013 3:00 PM
I suppose I should create a calculator on DiveBuddy for this :)


http://www.divebuddy.com/calculator/default.aspx
#50619
Subscribed
Greg - 5/16/2013 3:01 PM
From lerpy: Now to figure out my SAC rate.


There’s a DB calc for that:



http://www.divebuddy.com/calculator/sac.aspx
#1592
Subscribed
lerpy - 5/17/2013 6:02 AM
Thanks for the info guys. caves4me, the PSI is me not you, I put 3400 as that is the area that I normally fill to, in the 3400-3500PSI for most of my dives with that tank. I think it is a 3442.

Greg, thanks for the pointing me to the calculator. Again, love this site so much useful info.
#4307
caves4me - 5/17/2013 7:13 AM
Thanks lepry for the update! Be sure to use the rated cylinder pressure for your calculations.
#4307
caves4me - 5/17/2013 7:20 AM
Thanks Greg, you do an amazing job by keeping us informed.
#50619
Subscribed
Greg - 5/17/2013 9:19 AM
From caves4me: Thanks Greg, you do an amazing job by keeping us informed.


Thanks man! I try.
#5471
DiveBuddyChgo - 5/21/2013 4:45 PM
http://njscuba.net/gear/eqpt_05_tanks.html will have a volume/pressure calculation. Just fill in the blanks.
#50619
Subscribed
Greg - 5/22/2013 6:27 PM
Hey Lerpy! Thanks to you (and sort of me too:) ...we now have a tank air volume calculator on DiveBuddy:


http://www.divebuddy.com/calculator/tankvolume.aspx



Enjoy!