[PSUBS-MAILIST] Scott's new sub

[swaters@waters-ks.com via Personal_Submersibles]

I am really new to the engineering side of all this, but am working on it. I have some questions about the calc.

 *It shows material weight is 16351.9 n. Which I show a newton is .224lbs making material weight 3662lbs. Is that right?

*Displacement is 1899.67kg which I show a kg is .453 lbs making displacement 860.55lbs which seams wrong to me?

*Boyancy is 2277.43 n which means 510 lbs? Does that mean it is positive 510 lbs boyancy with no payload and no additional weights?

*at 1000m the pressure is 10.0518 MPa and max working pressure per ABS is 10.0762 MPa meaning it meets requirements. The sphere limit is 15.0391 MPa. Correct?

Sorry, student learning in process.
Thanks,
Scott Waters

Sent from my U.S. Cellular® Smartphone


-------- Original message --------
From: "Sean T. Stevenson via Personal_Submersibles" <personal_submersibles at psubs.org> 
Date:01/08/2015  8:04 PM  (GMT-06:00) 
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Subject: Re: [PSUBS-MAILIST] Scott's new sub 

On 2015-01-08 16:10, swaters at waters-ks.com via Personal_Submersibles wrote:
Cool. Thanks Vance. Yea, where I am stuck currently is the pressure calcs on 516 gr 70. My question was how thick of 516 gr 70 for a 60" sphere would it have to be to handle 3300 feet (2000 psi for safety margin. My second question is how positivly or negatively boyant would that be. I can reaily get hemispherical heads of 516 gr 70.
Thanks,
Scott Waters

Scott, rounding your desired working depth to 1000 m, here are the results as per the ABS minimum requirements.  Additional safety factor is up to you:

ASTM A516 Grade 70:


HY-100:


Sean

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