[PSUBS-MAILIST] formula

Fri Mar 3 22:27:26 EST 2017

Al,Hank is talking internal volume of a large tank. I was a bit confusedby that earlier.An 80 cubic ft scuba tank has an internal volume of about .353 cu ft.Hank is talking about something 30 times that size at 10.7 cu ft.Alan

      From: Al Secor via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Saturday, March 4, 2017 4:10 PM
 Subject: Re: [PSUBS-MAILIST] formula

How can the air in a 10.7 cu ft tank weigh almost 85 lbs? I could believe .848 lbs...best check your decimal point... Al Secor

      From: Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Friday, March 3, 2017 4:30 PM
 Subject: Re: [PSUBS-MAILIST] formula

84.8 lbs assuming a 60F ambient temperature.  See attached derivation.
Cliff
On Fri, Mar 3, 2017 at 2:52 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Alan,I need to know how much  a 10.7 cubic foot tank will extra when pumped up to 1,500 psi.  And how many cubic feet of air will I have when it is pumped up.Hank 

    On Friday, March 3, 2017 12:28 PM, Alan via Personal_Submersibles <personal_submersibles at psubs. org> wrote:

Hank,air weighs .0807 lbs per cubic foot approximately, depending on temperature.So if you have an 80 cubic foot scuba tank the air weight full is 6.45 lb.A scuba tank is 80 cubic ft at 3000 psi. If you halve the pressure you halvethe amount of air & weight. In other words, if you double the pressure youdouble the weight for a given volume.Let us know what you are trying to calculate if this doesn't help.Alan

Sent from my iPad
On 4/03/2017, at 6:33 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs. org> wrote:

Okay, I am stumped!  can someone give me a formula to calculate the weight of air at a particular psi per cubic foot.Thank youHank

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