<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><DIV>Hank, I actually don't really like the idea of having to deal with HP air inside the cabin. At least for now, I'll see how things go . I want to keep things fairly simple, after all I'm not an experienced old salt like yourself !</DIV><DIV> </DIV><DIV> </DIV><DIV> My Motor pods are coming along nicely !</DIV><DIV> </DIV><DIV> </DIV><DIV>Brian<BR><BR>--- personal_submersibles@psubs.org wrote:<BR><BR>From: hank pronk via Personal_Submersibles <personal_submersibles@psubs.org><BR>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><BR>Subject: Re: [PSUBS-MAILIST] inside ballast<BR>Date: Sat, 10 Dec 2016 18:10:54 +0000 (UTC)<BR><BR></DIV><DIV style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);"><DIV><SPAN>Brian,</SPAN></DIV><DIV><SPAN>I was at a hydraulic hose shop yesterday and they sell real nice 3,000 psi air hose with reusable ends. Why not just go with your original plan to blow the tank and use a good quality line to carry the water out. </SPAN></DIV><DIV><SPAN>Easy as pie and your done</SPAN></DIV><DIV><SPAN>Hank</SPAN></DIV> <DIV><BR><BR></DIV><DIV style="display: block;"> <DIV style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <DIV style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <DIV dir="ltr"><FONT face="Arial" size="2"> On Saturday, December 10, 2016 11:06 AM, Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<BR></FONT></DIV> <BR><BR> <DIV><DIV><DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><DIV>Thinking of something like this as a inside ballast pump. I think the diaphragm pumps would be better since the diaphragms are rubber and wouldn't rust;</DIV><DIV> </DIV><DIV> </DIV><DIV> <A href="https://www.amazon.com/100PSI-Pressure-Diaphragm-Water-Pump/dp/B00XDSJEJY">https://www.amazon.com/100PSI-Pressure-Diaphragm-Water-Pump/dp/B00XDSJEJY</A></DIV><DIV> </DIV><DIV> </DIV><DIV> </DIV><DIV>Brian<BR><BR>--- personal_submersibles@psubs.org wrote:<BR><BR>From: Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org><BR>To: "Personal Submersibles General Discussion" <personal_submersibles@psubs.org><BR>Subject: Re: [PSUBS-MAILIST] inside ballast<BR>Date: Thu, 8 Dec 2016 10:18:56 -0800<BR><BR></DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><DIV>Hmmm, that kind of makes a case for not using HP air to get rid of that water ballast inside the hull. My goal was not to really have a hard ballast but I guess using HP air to rid the water pretty much makes it a hard ballast by definition. Thanks for clarifying Sean ! I guess I wasn't thinking in terms of larger Swagelok piping since I've just been dealing with the 1/4" tubing -duh . Sean do you know of any manual HP pumps that are available ?</DIV><DIV> </DIV><DIV> The two methods for pumping out hard ballast is regardless of whether the tank is inside or out I imagine . </DIV><DIV> </DIV><DIV> </DIV><DIV>Thanks again,</DIV><DIV> </DIV><DIV>Brian<BR><BR>--- personal_submersibles@psubs.org wrote:<BR><BR>From: "Sean T. Stevenson via Personal_Submersibles" <personal_submersibles@psubs.org><BR>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><BR>Subject: Re: [PSUBS-MAILIST] inside ballast<BR>Date: Thu, 08 Dec 2016 09:44:37 -0700<BR><BR></DIV><DIV dir="ltr">If any pressure vessel inside the personnel compartment (or its associated piping / fittings downstream of a hull shutoff valve) were to fail and release its contents into the compartment, it must not raise the internal pressure of the compartment by more than 1 ATM (demonstrated by calculations). If it does, it must go outside, no exceptions.</DIV></DIV></DIV>
<DIV dir="ltr">Also, technically you're supposed to have two independent methods of emptying hard ballast tanks, so for example, pumping them out against the sea pressure with a high pressure pump (powered or manual) and simultaneously venting 1 ATM air into the tank with a check valve as one method, and opening the tank to sea and blowing it out with HP air as the second method.
</DIV><DIV dir="ltr">Sean
<BR><BR></DIV><DIV><DIV>On December 7, 2016 4:59:02 PM MST, Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<BLOCKQUOTE style="margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;">
<DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><DIV>I'm routing my lines to use two scuba tanks as my internal ballast. I estimate the total weight if they are both filled with water to be around 42 lbs. (about 570 cu in for each, alum 80's) . What kind of water line does everybody use? I was considering using soft copper but I'm not sure of it's pressure rating. Or maybe that is not such an issue. It could see some pressure using the HP tanks in a closed position, which then could be an issue I guess. But I would most likely just give a little blast of HP air to push the water out. Hmmm, wonder if I should have the option to vent outside the sub if I had some air pressure in the ballast tanks? or I guess I could just simply let it push all the water out and then it would get expelled that way. Are there any specific rules like that for inside ballast
tanks?</DIV><DIV> </DIV><DIV>Brian</DIV></DIV></BLOCKQUOTE></DIV></DIV><DIV></DIV><DIV style="margin-top: 2.5em; margin-bottom: 1em; border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"></DIV><PRE></PRE><DIV></DIV><HR><BR>Personal_Submersibles mailing list<BR>Personal_Submersibles@psubs.org<BR><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR>_______________________________________________
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