<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body ><div>Sean,</div><div>Perhaps I am interperting these wrong. I thought if the pressure at working depth is lower than maximum allowable working pressure then it passes ABS rules. If pressure at working depth is higher than maximum allowable pressure then it does not pass ABS rules. What am I looking for on these?</div><div>Thanks,</div><div>Scott Waters</div><div><br></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:01/09/2015 9:07 PM (GMT-06:00) <br>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br>Subject: Re: [PSUBS-MAILIST] Hull Calc: 78" spheres <br><br>
<div class="moz-cite-prefix">On 2015-01-09 18:16,
<a class="moz-txt-link-abbreviated" href="mailto:swaters@waters-ks.com">swaters@waters-ks.com</a> via Personal_Submersibles wrote:<br>
</div>
<blockquote cite="mid:hbuwxp9wnacwj7jd4kkkcp7i.1420852610049@email.android.com" type="cite">
<pre wrap="">Sean,
Can I ask you to do one more calc for me? 516 gr 70 sphere, 1" thick, 72" diameter.
The 78" was not within ABS rules at 1000m. I think the 72" might just make it, yet give me more boyancy than the 60"
Thanks,
Scott Waters
</pre>
</blockquote>
Not sure where you're going with this. The 60" sphere doesn't even
make it at 1" thickness. A 72" definitely won't.<br>
<br>
72" OD, 1" wall, ASTM A516 Grade 70:<br>
<br>
<img src="cid:_com_android_email_attachmentprovider_4_1105_RAW@sec.galaxytab" alt=""><br>
<br>
Just out of interest, I checked how small a sphere with 1" thick
hull would need to be to get you to 1000m. Turns out it's about 50
inches:<br>
<br>
<img src="cid:_com_android_email_attachmentprovider_4_1107_RAW@sec.galaxytab" alt=""><br>
<br>
Sean<br>
<br>
</body></html>