<html><head></head><body><p dir="ltr">Sorry I'm late to the party, but I had to check through my references. Ordinarily I refer to the ASME code for detail design items, but that document is not free for download and thus of limited utility for discussion here.</p>
<p dir="ltr">I did, however, find the appropriate section in the Steel Vessel Rules (2014), which is freely downloadable from eagle.org as with the UVHS rules. In fact, the ABS UVHS Rules defer to the Steel Vessel Rules for compliance, so anybody guiding a design using UVHS should also have a copy of the other reference handy.</p>
<p dir="ltr">The relevant sections in the Steel Vessel Rules are:</p>
<p dir="ltr">Part 4: Vessel Systems and Machinery<br>
Chapter 4: Boilers, Pressure Vessels and Fired Equipment<br>
Section 1: Appendix 1 - Rules for Design</p>
<p dir="ltr">Essentially, it boils down to the fact that single openings less than 2" nominal pipe size don't require any special analysis if they are in a shell with an inside diameter greater than four times the diameter opening.</p>
<p dir="ltr">Note that this is for isolated single openings only. Arrays of openings, such as a penetrator plate with multiple openings, must conform to other restrictions given in that section, and the plate itself must conform to the requirements for unstayed flat heads, also given in that section.</p>
<p dir="ltr">Openings larger than the 2" are subject to the same requirements for shell reinforcement as your viewport openings. These requirements are also detailed in that section, although designers should note that for submarines, all reinforcement needs to be integral to shell / nozzle walls and full-penetration welded. Doubler plates are not permitted.</p>
<p dir="ltr">Sean<br>
</p>
<br><br><div class="gmail_quote">On January 16, 2015 7:17:55 AM MST, via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<font color="black" size="3" face="Arial, Helvetica, sans-serif"><font size="3">Scott,</font>
</font><div><font color="black" size="3" face="Arial, Helvetica, sans-serif"><font size="3">Not sure about the engineering, but George told me that if things were about a diameter apart, then they would be okay. Maybe one of the guys will crunch the numbers. How big are these penetrators going to be?</font></font></div>
<div><font size="3">Vance<br />
</font><br />
<br />
<div style="font-size: 10pt; font-family: helvetica, arial; color: black;">-----Original Message-----<br />
From: swaters@waters-ks.com via Personal_Submersibles <personal_submersibles@psubs.org><br />
To: psubs <personal_submersibles@psubs.org><br />
Sent: Fri, Jan 16, 2015 9:01 am<br />
Subject: [PSUBS-MAILIST] Removable tru hulls<br />
<br />
<div id="AOLMsgPart_2_3ea2cc92-da92-4ef6-8e8f-afb4666ee090">
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<div>I am putting two removeable tru hulls in Trustworthy (same as Alec) for my manipulator arms. I want to put them close to the front veiw port of the sub. I know if I get to close to the front veiw port it hurts the structure. How close can I get to it and still not hurt the structure?</div>
<div>Thanks,</div>
<div>Scott Waters</div>
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<div style="font-size:9px;color:#575757">Sent from my U.S. Cellular® Smartphone</div>
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