|
Dan, I was thinking that if the you were not unconscious, and you had a high pressure air compressor rated to run off the subs power, you could use it to send excess air out of the sub to keep the sub interior at 1ATM. Also another option is to have the compressor set up with a special pressure regulator to remove excess air from the pressure hull automatically. This way since in the normal process of bringing in new air or O2 to your sub it would keep the pressure at 1ATM as well as work if your unconscious. This also would be helpful if your breathing from a SCUBA setup that you have in your sub for back-up. The exit pipe from the compressor would have a check valve as backup to keep water out of that line. As for the two valve setup for bringing in new air and a return line attached at the other end of the sub to remove bad air, I think there are some different configurations to consider. For both lines you can have both internal and external valves to operate them. The internal valves would need to be left open all the time unless you noticed a problem. The external valves could have some sort of easy to use keeper locks on them to keep them from being opened by accident. The keepers wouldn't need a key of any kind. For the exhaust line you can have a inline 1ATM pop off type one way valve, much like we use for hyperbaric chambers, to keep water from coming in even if you don't turn off the internal valve to it. For the intake line you can leave the interior valve open but if goes down to the bottom of the sub and then turns up and into a much larger tube that has a gravity ball device screwed onto it that keeps water from coming into the sub. I don't know the proper name for that device. I see it all the time used on large irrigation system. It allows the air out of the pipes, but when water hits the hollow plastic ball, it floats up and seals the exit hole. If you can find one with a threaded exit, you could add a length of pipe to it, to keep from getting water sprayed on you or the sub equipment. Also I think you need really easy to read exterior labels on or next to the two valves, so there is no mix-up. Perhaps even in more then one language. Perhaps even having the intake line valve painted green and the exhaust painted red. Regards, Brent Hartwig > From: jumachine@comcast.net > To: personal_submersibles@psubs.org > Subject: Re: [PSUBS-MAILIST] Viewport Question. > Date: Sun, 6 Jan 2008 13:48:01 -0500 > > Emile, > > Injecting ballast air in the MBT's would definitely be the first option when > divers are in the water. But assuming I already did that, then time has > passed and the drop weights are already released. For what ever reason, I'm > still glued to the bottom. It may become necessary to try the next step. > Keeping me alive where I am. > > Dan H. > ----- Original Message ----- > From: "Emile van Essen" <emile@airesearch.nl> > To: <personal_submersibles@psubs.org> > Sent: Sunday, January 06, 2008 12:31 PM > Subject: RE: [PSUBS-MAILIST] Viewport Question. > > > > Dan, > > > > I also dont like the idea of feeding air into the hull. > > What divers can do is blowing air with inflator or breathing apparatus > > into > > the MBT to surface the sub. Easy with the open bottom of a K boat, on the > > Peppers I made a connector for the inflatorhose. > > > > Regards, Emile > > > > -----Oorspronkelijk bericht----- > > Van: owner-personal_submersibles@psubs.org > > [mailto:owner-personal_submersibles@psubs.org] Namens Dan. H. > > Verzonden: zondag 6 januari 2008 17:36 > > Aan: personal_submersibles@psubs.org > > Onderwerp: Re: [PSUBS-MAILIST] Viewport Question. > > > > Some members of our local dive rescue team looked over my sub after it was > > completed. One recommendation they had was to add a fitting and valve on > > the outside of the hull to allow them to inject air into the hull if I was > > inside and unconscious. I never added it because I didn't like the idea > > of > > an open line into the hull without being in some closed system or with a > > closed valve on it. It may be a nice addition. At least, someone could > > dilute a contaminated atmosphere in the sub or increase the hull pressure > > if > > > > needed. > > > > Just a thought, > > Dan H. > > ----- Original Message ----- > > From: "Brian Cox" <ojaivalleybeefarm@dslextreme.com> > > To: <personal_submersibles@psubs.org> > > Sent: Sunday, January 06, 2008 12:50 AM > > Subject: RE: [PSUBS-MAILIST] Viewport Question. > > > > > >> Hi, > >> How would anyone be able to open your hatch if you are submerged? > >> The > >> pressure would be too great to open the hatch and even if they did the > >> sudden pressure change would probably damage parts of your body. > >> > >> Brian > >> > >> -----Original Message----- > >> From: owner-personal_submersibles@psubs.org > >> [mailto:owner-personal_submersibles@psubs.org]On Behalf Of Jim Kocourek > >> Sent: Saturday, January 05, 2008 5:04 PM > >> To: personal_submersibles@psubs.org > >> Subject: Re: [PSUBS-MAILIST] Viewport Question. > >> > >> > >> Hi Alec, > >> > >> I'm revisiting a previous area we discussed. You mentioned that you > >> seriously overbuilt your viewport bases to minimize distortion. I was > >> wondering what the size actually was. I am planning on having the OD full > >> thickness of the port base 2 inches thich and 1ne inch wide with the > >> portion > >> of the base supporting the viewport 1 1/4 inches wide and one inch thick. > >> How does this compare with yours. > >> > >> The viewport will be welded to 1/2 thick steel. > >> > >> If anyone else hase thoughts please share them. > >> > >> Thanks, > >> > >> Jim Kocourek > >> > >> ----- Original Message ----- > >> From: "Smyth, Alec" <Alec.Smyth@compuware.com> > >> To: <personal_submersibles@psubs.org> > >> Sent: Thursday, December 13, 2007 11:10 AM > >> Subject: RE: [PSUBS-MAILIST] Viewport Question. > >> > >> > >> Thanks Dan and Jim. The viewport retaining ring inside cutouts were > >> nicely sized to put inside the viewports, and I used the feeler gauge > >> method. Happily, I was not able to measure any deflection at all, the > >> viewport seats are still true after welding. A few years ago I'd put in > >> flat SS seats for bulkheads carrying electrical penetrators, and was > >> surprised at how much one of them had been bent by the welding. These > >> viewport seats were seriously over-built to avoid that problem, but it's > >> really nice to verify that it worked. > >> > >> cheers, > >> > >> Alec > >> > >> -----Original Message----- > >> From: owner-personal_submersibles@psubs.org > >> [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Dan. H. > >> Sent: Tuesday, December 11, 2007 6:13 PM > >> To: personal_submersibles@psubs.org > >> Subject: Re: [PSUBS-MAILIST] Viewport Question. > >> > >> Alex, > >> > >> All you need to check flatness of the viewport seats is something flat > >> that's the diameter of the lens and a set of feeler gauges. The first > >> thing that comes to mind for a flat reference is a disk of steel or > >> aluminum faced flat on a lathe. If not that maybe even a piece of plate > >> glass cut and nipped to fit into the housing. > >> > >> With the flat piece in the housing you can try to fit the feeler gauge > >> shims in behind it from the inside. If you can't fit any shims in, it's > >> flat. If you find you have a wobble you can stack up shims to see how > >> much out of flat it is. > >> > >> Your out of roundness is most likely an oval with one wide spot and one > >> narrow spot. It's probably going to be wide from top to bottom and > >> narrow from side to side because of the geometry of the intersection of > >> the two parts. If you don't have an inside micrometer set you can > >> measure it with a piece of rod, say about a 1/4 inch diameter, cut to > >> just fit the diameter of the hole in the narrowest part and then use it > >> and a feeler gauge to measure how loose it fits when inserted in the > >> same hole but in the widest part. > >> > >> Either that or wander up north on Rt 81 and I'll loan you the gauges. > >> > >> If you have to, a larger shop could put the whole conning tower on a > >> boring mill and true it up for you but hold on to your wallet. > >> Dan H. > >> ----- Original Message ----- > >> From: "Smyth, Alec" <Alec.Smyth@compuware.com> > >> To: <personal_submersibles@psubs.org> > >> Sent: Tuesday, December 11, 2007 1:17 PM > >> Subject: RE: [PSUBS-MAILIST] Viewport Question. > >> > >> > >> Hi Dan, > >> > >> I noted your comment about the slight distortion of the viewport seats > >> after welding. I've made mine rather massive in an effort to avoid that, > >> but d'you have a tip regarding how I can check whether it worked? I'd > >> love to get a dial indicator on them, but don't see an obvious way to do > >> that since they're welded into the coning tower. I'd really like to > >> check whether they're still flat before the tower goes on the sub, since > >> it should be possible (though admittedly hard), to refinish them by > >> turning the whole coning tower on a lathe. > >> > >> > >> Thanks, > >> > >> Alec > >> > >> > >> The contents of this e-mail are intended for the named addressee only. > >> It contains information that may be confidential. Unless you are the > >> named addressee or an authorized designee, you may not copy or use it, > >> or disclose it to anyone else. If you received it in error please notify > >> us immediately and then destroy it. > >> > >> From: owner-personal_submersibles@psubs.org > >> [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Dan. H. > >> Sent: Tuesday, December 11, 2007 8:31 AM > >> To: personal_submersibles@psubs.org > >> Subject: Re: [PSUBS-MAILIST] Viewport Question. > >> > >> James, > >> > >> Also be aware that acrylic thickness isn't constant even when cut from > >> the same sheet. It may be wise to have your acrylic parts in hand > >> before machining your rings. > >> > >> The only way to get a truly good fit between the lenses and housing > >> rings is to do a final machining after the rings are welded into the > >> hull, but most of us don't have that option. Anything else is just > >> doing the bet you can do with what happens after welding and the > >> tolerance of the acrylic you get. > >> > >> Hey! Nice web site! > >> Dan H. > >> ----- Original Message ----- > >> From: "James Frankland" <james@guernseysubmarine.com> > >> To: <personal_submersibles@psubs.org> > >> Sent: Tuesday, December 11, 2007 6:02 AM > >> Subject: [PSUBS-MAILIST] Viewport Question. > >> > >> > >> Hello All. > >> > >> Quick question regarding viewports tolerance. > >> > >> Ive started machining and have done 2 at the moment. Ive machined the > >> depth of the bore to be exactly 1.25 inches as per the plans, and the > >> inside diameter i have machined to 8 inches plus a clearance of 0.5 mm > >> to allow the lense to drop in. (sorry, the plans are imperial but we're > >> metric here, so its a bit of both). > >> > >> Im not making the acrylic lenses myself, i will buy them (probably from > >> psubs store). Assuming they come in exactly at 8 inches OD, as things > >> are they should slot in nice and tight. > >> > >> But Dan H mentioned to me that he got some slight distortion on the > >> ports after welding. > >> > >> So the question is, do you think 0.5 mm clearance is enough? Obviously > >> i cannot alter the ports once they are welded in, and don't want to have > >> to start machining the lenses, they must fit. > >> > >> You can have a look here as usual. Some of the text titles are wrong. > >> I'll > >> change them later. > >> > >> http://www.guernseysubmarine.com/index_files/Page7497.htm > >> > >> Any thoughts? > >> > >> Thanks > >> James > >> > >> > >> > >> > >> ----- Original Message ----- > >> From: Jay K. Jeffries [mailto:bottomgun@mindspring.com] > >> To: personal_submersibles@psubs.org > >> Sent: Mon, 10 Dec 2007 20:16:42 -0500 > >> Subject: [PSUBS-MAILIST] Digital Multi-Frequency Scanning Sonar > >> > >> Here is what looks like a great scanning sonar for a PSUB. If it is > >> priced like some of their other products, it should be a great deal. > >> > >> > >> > >> http://www.imagenex.com/html/881l_imaging.html > >> > >> > >> > >> R/Jay > >> > >> > >> > >> > >> > >> Respectfully, > >> > >> Jay K. Jeffries > >> > >> Andros Is., Bahamas > >> > >> > >> > >> A skimmer afloat is but a submarine, so poorly built it will not plunge. > >> > >> > >> > >> > >> > >> > >> > >> > >> ************************************************************************ > >> ************************************************************************ > >> ************************************************************************ > >> The personal submersibles mailing list complies with the US Federal > >> CAN-SPAM Act of 2003. Your email address appears in our database > >> because either you, or someone you know, requested you receive messages > >> from our organization. > >> > >> If you want to be removed from this mailing list simply click on the > >> link below or send a blank email message to: > >> removeme-personal_submersibles@psubs.org > >> > >> Removal of your email address from this mailing list occurs by an > >> automated process and should be complete within five minutes of our > >> server receiving your request. > >> > >> PSUBS.ORG > >> PO Box 53 > >> Weare, NH 03281 > >> 603-529-1100 > >> ************************************************************************ > >> ************************************************************************ > >> ************************************************************************ > >> > >> > >> > >> ************************************************************************ > >> ************************************************************************ > >> ************************************************************************ > >> The personal submersibles mailing list complies with the US Federal > >> CAN-SPAM Act of 2003. Your email address appears in our database > >> because either you, or someone you know, requested you receive messages > >> from our organization. > >> > >> If you want to be removed from this mailing list simply click on the > >> link below or send a blank email message to: > >> removeme-personal_submersibles@psubs.org > >> > >> Removal of your email address from this mailing list occurs by an > >> automated process and should be complete within five minutes of our > >> server receiving your request. > >> > >> PSUBS.ORG > >> PO Box 53 > >> Weare, NH 03281 > >> 603-529-1100 > >> ************************************************************************ > >> ************************************************************************ > >> ************************************************************************ > >> > >> > >> > >> > >> > >> > >> ************************************************************************ > >> ************************************************************************ > >> ************************************************************************ > >> The personal submersibles mailing list complies with the US Federal > >> CAN-SPAM Act of 2003. Your email address appears in our database > >> because either you, or someone you know, requested you receive messages > >> from our organization. > >> > >> If you want to be removed from this mailing list simply click on the > >> link below or send a blank email message to: > >> removeme-personal_submersibles@psubs.org > >> > >> Removal of your email address from this mailing list occurs by an > >> automated process and should be complete within five minutes of our > >> server receiving your request. > >> > >> PSUBS.ORG > >> PO Box 53 > >> Weare, NH 03281 > >> 603-529-1100 > >> ************************************************************************ > >> ************************************************************************ > >> ************************************************************************ > >> > >> > >> > >> > >> ************************************************************************ > >> ************************************************************************ > >> ************************************************************************ > >> The personal submersibles mailing list complies with the US Federal > >> CAN-SPAM Act of 2003. Your email address appears in our database > >> because either you, or someone you know, requested you receive messages > >> from our organization. > >> > >> If you want to be removed from this mailing list simply click on the > >> link below or send a blank email message to: > >> removeme-personal_submersibles@psubs.org > >> > >> Removal of your email address from this mailing list occurs by an > >> automated process and should be complete within five minutes of > >> our server receiving your request. > >> > >> PSUBS.ORG > >> PO Box 53 > >> Weare, NH 03281 > >> 603-529-1100 > >> ************************************************************************ > >> ************************************************************************ > >> ************************************************************************ > >> > >> > >> > >> -- > >> No virus found in this incoming message. > >> Checked by AVG Free Edition. > >> Version: 7.5.503 / Virus Database: 269.17.1/1183 - Release Date: > >> 12/13/2007 > >> 9:15 AM > >> > >> > >> > >> > >> ************************************************************************ > >> ************************************************************************ > >> ************************************************************************ > >> The personal submersibles mailing list complies with the US Federal > >> CAN-SPAM Act of 2003. Your email address appears in our database > >> because either you, or someone you know, requested you receive messages > >> from our organization. > >> > >> If you want to be removed from this mailing list simply click on the > >> link below or send a blank email message to: > >> removeme-personal_submersibles@psubs.org > >> > >> Removal of your email address from this mailing list occurs by an > >> automated process and should be complete within five minutes of > >> our server receiving your request. > >> > >> PSUBS.ORG > >> PO Box 53 > >> Weare, NH 03281 > >> 603-529-1100 > >> ************************************************************************ > >> ************************************************************************ > >> ************************************************************************ > >> > >> > >> > >> > >> > >> > >> > >> ************************************************************************ > >> ************************************************************************ > >> ************************************************************************ > >> The personal submersibles mailing list complies with the US Federal > >> CAN-SPAM Act of 2003. Your email address appears in our database > >> because either you, or someone you know, requested you receive messages > >> from our organization. > >> > >> If you want to be removed from this mailing list simply click on the > >> link below or send a blank email message to: > >> removeme-personal_submersibles@psubs.org > >> > >> Removal of your email address from this mailing list occurs by an > >> automated process and should be complete within five minutes of > >> our server receiving your request. > >> > >> PSUBS.ORG > >> PO Box 53 > >> Weare, NH 03281 > >> 603-529-1100 > >> ************************************************************************ > >> ************************************************************************ > >> ************************************************************************ > >> > >> > > > > > > > > > > > > ************************************************************************ > > ************************************************************************ > > ************************************************************************ > > The personal submersibles mailing list complies with the US Federal > > CAN-SPAM Act of 2003. Your email address appears in our database > > because either you, or someone you know, requested you receive messages > > from our organization. > > > > If you want to be removed from this mailing list simply click on the > > link below or send a blank email message to: > > removeme-personal_submersibles@psubs.org > > > > Removal of your email address from this mailing list occurs by an > > automated process and should be complete within five minutes of > > our server receiving your request. > > > > PSUBS.ORG > > PO Box 53 > > Weare, NH 03281 > > 603-529-1100 > > ************************************************************************ > > ************************************************************************ > > ************************************************************************ > > > > No virus found in this incoming message. > > Checked by AVG Free Edition. > > Version: 7.5.516 / Virus Database: 269.17.13/1210 - Release Date: 5-1-2008 > > 11:46 > > > > > > No virus found in this outgoing message. > > Checked by AVG Free Edition. > > Version: 7.5.516 / Virus Database: 269.17.13/1210 - Release Date: 5-1-2008 > > 11:46 > > > > > > > > > > > > ************************************************************************ > > ************************************************************************ > > ************************************************************************ > > The personal submersibles mailing list complies with the US Federal > > CAN-SPAM Act of 2003. Your email address appears in our database > > because either you, or someone you know, requested you receive messages > > from our organization. > > > > If you want to be removed from this mailing list simply click on the > > link below or send a blank email message to: > > removeme-personal_submersibles@psubs.org > > > > Removal of your email address from this mailing list occurs by an > > automated process and should be complete within five minutes of > > our server receiving your request. > > > > PSUBS.ORG > > PO Box 53 > > Weare, NH 03281 > > 603-529-1100 > > ************************************************************************ > > ************************************************************************ > > ************************************************************************ > > > > > > > > > > ************************************************************************ > ************************************************************************ > ************************************************************************ > The personal submersibles mailing list complies with the US Federal > CAN-SPAM Act of 2003. Your email address appears in our database > because either you, or someone you know, requested you receive messages > from our organization. > > If you want to be removed from this mailing list simply click on the > link below or send a blank email message to: > removeme-personal_submersibles@psubs.org > > Removal of your email address from this mailing list occurs by an > automated process and should be complete within five minutes of > our server receiving your request. > > PSUBS.ORG > PO Box 53 > Weare, NH 03281 > 603-529-1100 > ************************************************************************ > ************************************************************************ > ************************************************************************ > |