[PSUBS-MAILIST] volume calculation

[Alan James via Personal_Submersibles]

Hi Hank,with no first stage regulator, at 400ft there will be 200psi pressure left in the tank.Based on an 80cuft tank, the internal size of a 122 cuft tank would be about .58cuftAt 200psi you would x that x 13 = 7.54 cuft left in the tank. Subtract this from youroriginal 122 = 114.46cuft. then as Alec says divide by 13 = 8.8cuft.This will give you 549 lb  of lift (249.1kg)Alan
      From: Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Saturday, November 8, 2014 3:25 AM
 Subject: Re: [PSUBS-MAILIST] volume calculation
   
P1V1 = P2V2
1 atm x 122 cf = 13.1 atm x V2
Therefore V2 = 9.3 cf


On Fri, Nov 7, 2014 at 8:23 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hello all,
I need help with a lift bag calculation.  I have a 122 cubic foot hp tank going one one side of Gamma for a lift bag.  How many cubic feet of air will I have in the lift bag at 400 feet after emptying the air tank.
Thank you
Hank
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