<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">James, also notice on Gamma’a plans the hull has drilled holes with taper thread penetrators. Perhaps a welded reinforcement is not necessary. I have a drilled hole in my 1 inch thick hatch that is tapered with no reinforcement, that survived a 1,250 psi pressure test. <div>Hank<br><br><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On Jun 2, 2023, at 6:08 AM, Antoine Delafargue via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="auto">Hello James</div><div dir="auto">Pretty sure it should be full pen in most rules. </div><div dir="auto"><br></div><div dir="auto">But if the location of your hole in the conning tower does not contribute to the structural reinforcement of the opening that your conning tower is making in the hull’s main cylinder,</div><div dir="auto">(Ie is far enough from the hull’s main cylinder),</div><div dir="auto"><br></div><div dir="auto">Then you may just thread your hole and just insert a male threaded tapered through hull into it with some loctite but without any extra weld. </div><div dir="auto">I did exactly that on Pilot Fish for the ballast purge valve controls.</div><div dir="auto"><br></div><div dir="auto">Regards</div><div dir="auto">Antoine </div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le ven. 2 juin 2023 à 13:38, James Frankland via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr">Hi Jon<div>Ive scoured ABS and i cant see anything specific about it. Im sure its there somewhere, i just cant find it.</div><div><br></div><div>Ive just re-read my email and it might have been confusing. I do mean small penetrators, not large penetrations such as viewports. Obviously they must be 100% pen.</div><div><br></div><div>Anyone else got any ideas?<br>Thanks</div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 2 Jun 2023 at 02:41, Jon Wallace via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div><div style="font-family:"times new roman","new york",times,serif;font-size:16px"><div style="font-family:"times new roman","new york",times,serif"></div>
<div dir="ltr" style="font-family:"times new roman","new york",times,serif">Reviewing ABS or ASME steel vessel rules may shed some light on the issue. My understanding is that anything two inches or less requires only fillet welds. The rule may actually be a ratio to the hull diameter rather than a specific number, however I do believe your 30mm penetrator is perfectly safe with fillet welds.</div><div dir="ltr" style="font-family:"times new roman","new york",times,serif"><br></div><div dir="ltr" style="font-family:"times new roman","new york",times,serif">Jon</div><div dir="ltr" style="font-family:"times new roman","new york",times,serif"><br></div><div dir="ltr" style="font-family:"times new roman","new york",times,serif"><br></div><div style="font-family:"times new roman","new york",times,serif"><br></div>
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On Thursday, June 1, 2023 at 09:39:45 AM EDT, James Frankland via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif">personal_submersibles@psubs.org</a>> wrote:
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<div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif"><div id="m_2915493300910049180m_-9015690594049241604m_1963857151617410026ydp64116954yiv6061614044" style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif"><div dir="ltr" style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif">Hi All<div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif"><br></div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif">Any thoughts on this. I have always thought that welds for through hull fittings are not required to be full penetration. Just keep the hole as tight as possible to the fitting.</div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif"><br></div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif">Ive been talking to some people who say that the joints should be full pen.</div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif"><br></div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif">Obviously full pen is best, but has issues with accessibility and warping.</div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif"><br></div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif">On Jodie B i just welded all the penetrators in with a double fillet as i believe was shown in the plans.</div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif"><br></div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif">Gamma plans show a "mostly" full pen weld for one of their penetrators. See pic.</div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif"><br></div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif">I am thinking of putting a 30mm diameter penetrator through the 25mm conning tower base. This is a bit of a monster to get full pen.</div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif"><br></div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif">What do you guys think? Anyone put a penetrator through such thick material before?</div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif"><br></div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif">Any views on penetration of small welded fittings?</div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif"><br></div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif"><br></div></div>
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