<div style="font-family: Arial, sans-serif; font-size: 14px;">Here is your hull using ASTM A516 Grade 70 steel, assuming that the 2 m dimension is the outer diameter of the sphere:</div><div style="font-family: Arial, sans-serif; font-size: 14px;"><br></div><div style="font-family: Arial, sans-serif; font-size: 14px;"><img alt="image.png" class="proton-embedded" src="cid:f05aad5b@protonmail.com"><br></div><div style="font-family: Arial, sans-serif; font-size: 14px;"><br></div><div style="font-family: Arial, sans-serif; font-size: 14px;">If I repeat the calculation, but use 2 m as the inside diameter (generally you design to ID, because that is typically how heads are manufactured), you get the following:</div><div style="font-family: Arial, sans-serif; font-size: 14px;"><br></div>
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<div style="font-family: Arial, sans-serif; font-size: 14px;"><img alt="image.png" class="proton-embedded" src="cid:bb315b58@protonmail.com"><br><div class="protonmail_quote"><br></div><div class="protonmail_quote">Hope that helps.</div><div class="protonmail_quote"><br></div><div class="protonmail_quote">Sean</div><div class="protonmail_quote"><br></div><div class="protonmail_quote"><br></div><div class="protonmail_quote">
On Monday, November 3rd, 2025 at 23:42, via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br>
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<div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thank you Sean, It was so pleasing that several people unselfishly replied to my request.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thank you for the calc offer, no, the weight factor is for a completely different reason. If that is the weight then it is far too heavy I had considered 1/4” thickness sheet would be suitable, but did not know the framing required and safety margin requirements. To confirm this is for 100m (150psi) no opening no window, just the sphere! Again, thank you, Cheers Les </span><span style="font-size:11.0pt;font-family:"Segoe UI Emoji",sans-serif">😉</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><blockquote type="cite"><div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm"><p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Personal_Submersibles <personal_submersibles-bounces@psubs.org> <b>On Behalf Of </b>Sean T. Stevenson via Personal_Submersibles<br><b>Sent:</b> Friday, 24 October 2025 2:10 AM<br><b>To:</b> Personal Submersibles General Discussion <personal_submersibles@psubs.org><br><b>Subject:</b> Re: [PSUBS-MAILIST] Assistance needed, anyone please!</span></p></div><p class="MsoNormal"> </p><div><p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif">Les, I can happily run some test cases this weekend to figure the hull material weight of your proposed sphere, but if your concern is the ultimate handling / trailering weight, as a functional submersible that is going to be exactly the weight of an equivalent sphere of seawater, at ~ 1,025 kg/m^3. For your 2m sphere, that will be 4,293.5 kg or 9,465.5 lbs.</span></p></div><div><p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif"> </span></p></div><div><p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif">Sean</span></p></div><div><p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif"> </span></p></div><div><p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif"> </span></p></div><div><p class="MsoNormal">On Wednesday, October 22nd, 2025 at 19:00, via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" rel="noreferrer nofollow noopener">personal_submersibles@psubs.org</a>> wrote:<br><br></p><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><div><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt"> </span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color: black;">After many years and many hospital holidays, </span><span style="font-family: "Segoe UI Emoji", sans-serif; color: black;">🙂</span><span style="color: black;"> I am no longer a financial member.</span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color: black;">However, I am hoping that someone may assist me in the spirit of Psubs.</span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color: black;">If memory serves, there was a calc formula on your site of which I no longer have access .</span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color: black;">Any way, I have a project idea that to continue with, relies on the minimum weight achievable for the following ;</span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color: black;"> </span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color: black;">A 2 meter diameter sphere with appropriate bracing material and with safety margins </span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color: black;">To dive to sea-water safe depth of 150meter (160psi) No doors No windows </span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color: black;">Windows and doors will add much I know, however, are details to be considered later only if the basic weight indication makes the project viable.</span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color: black;">So basically, I need to know the framing and sheeting steel sizes and thicknesses to <b>calculate the overall weight</b> in this basic form. If positive at such point I will apply for re- membership to follow through with my idea.</span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color: black;">I know this sounds vague and I am asking much, but could someone assist me in this very basic task, which I know not how to do. </span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color: black;">Thanking any member who might be inclined to assist me. </span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color: black;">Cheers Les </span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color: black;">Safe diving </span><span style="font-family: "Segoe UI Emoji", sans-serif; color: black;">🙂</span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt"> </span></p></div></blockquote><p class="MsoNormal"> </p></div></blockquote></div>
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