<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1444194391678_2892"><span id="yui_3_16_0_1_1444194391678_2891">I saw some oil filled pressure gauges today.</span></div><div id="yui_3_16_0_1_1444194391678_2896"><span id="yui_3_16_0_1_1444194391678_3169">The oil only went 3/4 or so up the dial face.</span></div><div id="yui_3_16_0_1_1444194391678_2896"><span id="yui_3_16_0_1_1444194391678_3034">I asked why it didn't completely fill the inside, but the sales person couldn't tell me.</span></div><div id="yui_3_16_0_1_1444194391678_2896"><span id="yui_3_16_0_1_1444194391678_3184">We surmised that the purpose of the oil was as a buffer in case of explosion.</span></div><div id="yui_3_16_0_1_1444194391678_2896"><span>So if you find an oil filled gauge it is not necessarily going to be full or pressure</span></div><div id="yui_3_16_0_1_1444194391678_2896"><span>resistant.</span></div><div id="yui_3_16_0_1_1444194391678_2896"><span>Cheers Alan</span></div><br> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1444194391678_2819"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1444194391678_2818"> <div dir="ltr" id="yui_3_16_0_1_1444194391678_2817"> <hr size="1"> <font size="2" face="Arial" id="yui_3_16_0_1_1444194391678_2816"> <b><span style="font-weight:bold;">From:</span></b> Private via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Tuesday, September 22, 2015 12:30 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Gauge for outside viewport?<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1444194391678_2820"><br>Light from inside, it'll be right up against the window.<br><br><br><br>> On Sep 21, 2015, at 8:09 PM, Pete Niedermayr via Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br>> <br>> What about illumination ?<br>> <br>> Pete <br>> --------------------------------------------<br>> On Mon, 9/21/15, Alec Smyth via Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br>> <br>> Subject: Re: [PSUBS-MAILIST] Gauge for outside viewport?<br>> To: "Personal Submersibles General Discussion" <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>> Date: Monday, September 21, 2015, 6:35 PM<br>> <br>> It would<br>> go outside one of the CT viewports. Specifically, the one<br>> that looks back toward the stern and is therefore seldom<br>> used. The tank pressure is something I normally look at just<br>> once before a dive. You want to be able to see it if you<br>> want to, but it's not a frequent-use item I would put<br>> right in front of the pilot where real estate is most<br>> precious.<br>> So far I<br>> still haven't located a liquid filled SPG. The one<br>> Stephen suggested is for sale in Germany but I haven't<br>> located it here yet.<br>> <br>> Thanks,<br>> Alec<br>> On Mon, Sep 21, 2015 at<br>> 7:08 PM, Pete Niedermayr via Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>> wrote:<br>> Alec,<br>> Where are you thinking of mounting the gauges ? Outside one<br>> of the conn viewports ? Outside the dome ? Or 2 sets for one<br>> each ?<br>> <br>> <br>> <br>> Pete<br>> <br>> --------------------------------------------<br>> <br>> On Mon, 9/21/15, Alec Smyth via Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>> wrote:<br>> <br>> <br>> <br>> Subject: Re: [PSUBS-MAILIST] Gauge for outside<br>> viewport?<br>> <br>> To: "Personal<br>> Submersibles General Discussion" <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>> <br>> Date: Monday, September 21, 2015, 8:34 AM<br>> <br>> <br>> <br>> Exactly.<br>> <br>> The valves to blow ballast are outside and operated via<br>> <br>> through-hulls.<br>> <br>> On Mon, Sep 21, 2015 at<br>> <br>> 8:57 AM, James Frankland via Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>> <br>> wrote:<br>> <br>> >1) I<br>> <br>> have a bunch of oil filled gauges lying around, but if<br>> they<br>> <br>> are left in any position other than with the rubber caps<br>> at<br>> <br>> the top, they leak all over the place. The shelf they<br>> live<br>> <br>> on is covered with oil, so I'm just not confident<br>> they<br>> <br>> will >keep the oil inside in the<br>> <br>> field. Yes, I suppose so. The ones<br>> <br>> I have drip. I thought i'd sprung a minor hull leak<br>> at<br>> <br>> first... >2) Yes,<br>> <br>> SCUBA tank gauges have a tiny orifice in their hose<br>> fittings<br>> <br>> for just that purpose, to prevent a broken instrument<br>> from<br>> <br>> emptying your tank too quickly. That is good and I plan<br>> to<br>> <br>> use it on the sub as well. However, the problem<br>>> still<br>> <br>> persists that SCUBA gauges can only be taken to under<br>> 500<br>> <br>> feet. I came across tech diver accounts of gauge issues<br>> such<br>> <br>> as the plastic faces buckling and pinning the needle, or<br>> the<br>> <br>> whole enclosure imploding at about 400<br>> <br>> >feet. oh. Are you not having<br>> <br>> the HP lines inside the sub at all? Controlling the<br>> air<br>> <br>> with a through hull? <br>> <br>> RegardsJames<br>> <br>> On 21 September 2015 at<br>> <br>> 13:20, Alec Smyth via Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>> <br>> wrote:<br>> <br>> Hi James,<br>> <br>> 1) I<br>> <br>> have a bunch of oil filled gauges lying around, but if<br>> they<br>> <br>> are left in any position other than with the rubber caps<br>> at<br>> <br>> the top, they leak all over the place. The shelf they<br>> live<br>> <br>> on is covered with oil, so I'm just not confident<br>> they<br>> <br>> will keep the oil inside in the field.<br>> <br>> 2) Yes, SCUBA tank gauges have a<br>> <br>> tiny orifice in their hose fittings for just that<br>> purpose,<br>> <br>> to prevent a broken instrument from emptying your tank<br>> too<br>> <br>> quickly. That is good and I plan to use it on the sub<br>> as<br>> <br>> well. However, the problem still persists that SCUBA<br>> gauges<br>> <br>> can only be taken to under 500 feet. I came across tech<br>> <br>> diver accounts of gauge issues such as the plastic<br>> faces<br>> <br>> buckling and pinning the needle, or the whole enclosure<br>> <br>> imploding at about 400 feet. <br>> <br>> <br>> <br>> Thanks,<br>> <br>> Alec <br>> <br>> <br>> <br>> On Mon, Sep 21, 2015 at<br>> <br>> 5:03 AM, James Frankland via Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>> <br>> wrote:<br>> <br>> Hi Alec, I have a<br>> <br>> couple of thoughts. 1. The<br>> <br>> gauges I have are chemical protected, so they have an<br>> oil<br>> <br>> filled diaphragm separating the inlet line from the<br>> gauge<br>> <br>> internals. Then there is a small vent hole at the top<br>> of<br>> <br>> the gauge. You could attach a rubber hose\bladder<br>> to<br>> <br>> this vent hole, top it up with glycerine or whatever<br>> the<br>> <br>> gauge is filled with and have a fully compensated valve<br>> with<br>> <br>> a bladder. 2. How about using just<br>> <br>> a normal scuba gauge which will probably be perfectly<br>> <br>> fine. But, just make a small adapter that screws onto<br>> the<br>> <br>> gauge and has only a tiny little orifice to allow the<br>> input<br>> <br>> air. That way if the gauge did ever fail, it would<br>> only<br>> <br>> bleed out air slowly and you'd have time to blow<br>> <br>> tanks. If you are using a scuba 1st stage and piping<br>> from<br>> <br>> the HP port (I assume your not and are plumbing<br>> straight<br>> <br>> into tanks) then the scuba HP already has this small<br>> hole<br>> <br>> for the same reason. Also, it would<br>> <br>> be easy enough to test a gauge. Find somewhere deep<br>> <br>> enough and take a fishing rod and a packed<br>> <br>> lunch! Im fairly sure Emile has<br>> <br>> external gauges on his sub and its a 200m diver. He<br>> could<br>> <br>> maybe advise? Just a thought.<br>> <br>> Kind Regards<br>> <br>> James <br>> <br>> On 21 September<br>> <br>> 2015 at 06:51, Brian Cox via Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>> <br>> wrote:<br>> <br>> Hi Alec, New sub ? <br>> <br>> I must have missed that ! do you have any<br>> <br>> details? BTW, I received that big gage ! <br>> It's<br>> <br>> huge ! I hope I can get it in through the hatch ! <br>> As<br>> <br>> it is designed for sea water I assume all I have to do<br>> is<br>> <br>> plumb it in, will salt water getting into the tubing<br>> cause<br>> <br>> any problems? Brian<br>> <br>> <br>> <br>> --- <a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br>> <br>> wrote:<br>> <br>> <br>> <br>> From: Alec Smyth via<br>> <br>> Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>> <br>> To: Personal Submersibles General Discussion<br>> <br>> <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>> <br>> Subject: [PSUBS-MAILIST] Gauge for<br>> <br>> outside viewport?<br>> <br>> Date: Sun, 20 Sep<br>> <br>> 2015 23:03:02 -0400<br>> <br>> <br>> <br>> I have an<br>> <br>> interesting thing to think about and wondered if any of<br>> the<br>> <br>> PSUBS brain trust might have a suggestion.<br>> <br>> One of the simplifications on my new<br>> <br>> sub is that all HP air lines are external, aside from<br>> the<br>> <br>> BIBS (which is normally shut off anyway). Thus, I'm<br>> <br>> looking for a 3,000-4,000 psi gauge to mount outside a<br>> <br>> viewport, like in the Pisces photo that I'll paste<br>> <br>> below. In case my paste doesn't come through, it is<br>> the<br>> <br>> one at the top of the following article: <a href="http://www.nytimes.com/2015/09/15/science/piloted-deep-sea-research-is-bottoming-out.html?_r=1" target="_blank">http://www.nytimes.com/2015/09/15/science/piloted-deep-sea-research-is-bottoming-out.html?_r=1</a><br>> <br>> The first thing that came to mind<br>> <br>> was to use a SCUBA submersible pressure gauge, but the<br>> <br>> problem is these are normally 1 atm dry enclosures of<br>> <br>> limited depth rating. There is generally little<br>> information<br>> <br>> posted about how deep they'll go, but what I did<br>> find<br>> <br>> was mentioned 260 feet for the plastic ones and 490 feet<br>> for<br>> <br>> the brass variety. This is a 1,000 foot sub.<br>> <br>> The second idea was to use oil<br>> <br>> filled gauges intended for above-water use. But these<br>> <br>> generally have considerable bubbles in the oil, are not<br>> very<br>> <br>> good at keeping the oil inside, and have other hardware<br>> not<br>> <br>> intended to live long in sea water.<br>> <br>> Any suggestions would be most<br>> <br>> welcome!<br>> <br>> <br>> <br>> <br>> <br>> Thanks,<br>> <br>> Alec <br>> <br>> <br>> <br>> <br>> <br>> <br>> <br>> --089e0115ebd0a0d2500520391e8b--_______________________________________________<br>> <br>> Personal_Submersibles mailing list<br>> <br>> <a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br>> <br>> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br>> <br>> <br>> <br>> _______________________________________________<br>> <br>> <br>> <br>> Personal_Submersibles mailing list<br>> <br>> <br>> <br>> <a 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