<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body ><div>I am really new to the engineering side of all this, but am working on it. I have some questions about the calc.</div><div><br></div><div> *It shows material weight is 16351.9 n. Which I show a newton is .224lbs making material weight 3662lbs. Is that right?</div><div><br></div><div>*Displacement is 1899.67kg which I show a kg is .453 lbs making displacement 860.55lbs which seams wrong to me?</div><div><br></div><div>*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?</div><div><br></div><div>*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?</div><div><br></div><div>Sorry, student learning in process.</div><div>Thanks,</div><div>Scott Waters</div><div><br></div><div><div style="font-size:9px;color:#575757">Sent from my U.S. Cellular® Smartphone</div></div><div></div><br><br>-------- Original message --------<br>From: "Sean T. Stevenson via Personal_Submersibles" <personal_submersibles@psubs.org> <br>Date:01/08/2015 8:04 PM (GMT-06:00) <br>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br>Subject: Re: [PSUBS-MAILIST] Scott's new sub <br><br>
<div class="moz-cite-prefix">On 2015-01-08 16:10,
<a class="moz-txt-link-abbreviated" href="mailto:swaters@waters-ks.com">swaters@waters-ks.com</a> via Personal_Submersibles wrote:<br>
</div>
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<div>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.</div>
<div>Thanks,</div>
<div>Scott Waters</div>
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<br>
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:<br>
<br>
ASTM A516 Grade 70:<br>
<img src="cid:_com_android_email_attachmentprovider_4_1049_RAW@sec.galaxytab" alt=""><br>
<br>
HY-100:<br>
<img src="cid:_com_android_email_attachmentprovider_4_1050_RAW@sec.galaxytab" alt=""><br>
<br>
Sean<br>
<br>
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